Undervolting: how low can you go?
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee
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Undervolting: how low can you go?
I've done a bit of undervolting with several CPUs and discovered that one can save quite a bit of energy with it, especially if you're involved in things like folding@home. Although the procedure is quite simple, finding out the minimum voltage values for your CPU takes a bit of time testing etc. It would be nice to have a collection of data that people can use as a reference point. Therefore I'd like to ask everyone who has undervolted his CPU to submit his results.
Here's a tutorial. It's a bit outdated but still useful. There's also a lot of info to be found on this forum as well.
Programs for undervolting (and -clocking):
RMClock
CrystalCPUID
or for notebooks Notebook Hardware Control
Programs for stress testing (there are many others):
Prime95
Orthos
WARNING: Although CPUs of same type and stepping usual share the same undervolting options, there can always be individual discrepancies. The results shown below are indications.
We're looking for minimum voltage at minimum clock speed and minimum voltage at stock speed (with a stable system of course). Here's what we've got so far:
Athlon XP 2500+ - Barton (1.83GHz)
Stock: 1.87 GHz (11*170) @ 1.375 V (stock 1.60v)
AMD XP 2500+ - Mobile Barton stock - 1.45V
Minimum: 1.5 GHz @ 1.200 V
Stock: 1.83 GHz @ 1.3600 V
AMD Sempron 64 3000+ (754) stock - 1.4V
Minimum: 0.8 GHz @ 1.100 V (lowest possible, E6 stepping bug)
Stock: 1.8 GHz @ 1.150 V
OC: 2,3 GHz @ 1.400 V
AMD Athlon 64 3000+ - Clawhammer (754) stock - 1.5V
Minimum: 0.8 GHz @ 0.825 V
Stock: 2 GHz @ 1,375 V
AMD Athlon 64 3200+ - Newcastle (754) stock - 1.5V
Minimum:
Stock: 2.2 GHz @ 1.300 V
Turion ML-30 - Lancaster (754) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.6 GHz @ 0.925 V
AMD Athlon 64 3000+ - Winchester (939) stock - 1.4V
Stock: 1.8 GHz @ 1.104-1120 V
AMD Athlon 64 3200+ - Venice (939) stock - 1.35V
Minimum: 1.0 GHz @ 1.100 V (-> Vcore lock)
Stock: 2.0 GHz @ 1.125 V
Minimum: 1.0 GHz @ 1.100 V (-> Vcore lock)
Stock: 2.0 GHz @ 1.125 V
OC'ed: 2.25 GHz @ 1.275 V
OC'ed: 2.5 GHz @ 1.425 V
AMD Athlon 64 3500+ - Venice (939) stock - 1.35V
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.2 GHz @ 1.175 V
OC'ed: 2.7 GHz @ 1.325 V
AMD Athlon X2 4600+ - Manchester (939) stock - 1.35V
Minimum: 1.0 GHz @ 1.100 V (Note: lowest possible VID)
Stock: 2.4 GHz @ 1.225 V
AMD Opteron 165 - Denmark (939) stock - 1.35V
Minimum: 1.1 GHz @ 0.825 V
Stock: 1.8 GHz @ 1.000 V
OC'ed: 2.5 GHz @ 1.250 V
AMD Opteron 170 - Denmark (939) stock - 1.35V
Stock: 2.0 GHz @ 1.100 V
AMD Opteron 185 - Denmark (939) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 2.6 GHz @ 1.200 V
AMD Athlon 64 3000+ - Winchester (AM2) stock - 1.4V
Minimum: 1.0 GHz @ 1,1 V
Stock: 1.8 GHz @ 1,175 V
AMD Athlon 64 3000+ - Orleans (AM2, Revision F2) stock - 1.4V
Minimum: 1.0 GHz @ 0.825 V
Stock: 1.8 GHz @ 1.100 V
AMD Sempron 64 3200+ - Manila (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.8 GHz @ 1.000 V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.8 GHz @ 0.900 V (not thoroughly tested)
AMD Sempron 64 3400+ (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.8 GHz @ 1.000 V
AMD Sempron LE-1100 - Sparta (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.9 GHz @ 0.950 V (12 hrs Orthos)
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.9 GHz @ 1.000 V
AMD Sempron LE-1250 - Sparta (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 2.2 GHz @ 0.975 V
AMD Athlon 64 3500+ - Orleans (AM2, Rev. F2) stock - 1.35V
Minimum: 1.0 GHz @ 0.900 V
Stock: 2.2 GHz @ 1.100 V
AMD Athlon 64 3500+ - Lima (AM2) stock - 1.35V
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.2 GHz @ 1.025 V
AMD Athlon X2 3600+ - Windsor (AM2) stock - 1.25V?
Minimum: 1.0 GHz @ 0.900 V
Stock: 2.0 GHz @ 1.075 V
AMD Athlon X2 3600+ - Brisbane (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.9 GHz @ 1.000 V
Minimum: 1.0 GHz @ 0.825 V
Stock: 1.9 GHz @ 1.000 V
AMD Athlon X2 3800+ - Windsor (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.900 V
Stock: 2.0 GHz @ 1.125 V
OC'ed (sort of): 2.3 GHz @ 1.275 V
Minimum: 1 GHz @ 0.800 V
1.6 GHz (Crystal CPUID): 1.6 GHz @ 0.900 V
Stock: 2.0 GHz @ 0.975 V
AMD Athlon X2 4000+ - Brisbane (AM2) stock - 1.35V
Minimum: 1.0 GHz @ 0.856 V
Stock: 2.1 GHz @ 1.031 V
Minimum: 1.0 GHz @ 0.864 V
Stock: 2.1 GHz @ 1.056 V
AMD Athlon X2 4200+ - Windsor (AM2) stock - 1.25V
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.2 GHz @ 1,125 V
AMD Athlon X2 4400+ - Brisbane (AM2, Rev. G2) stock - 1.3V
Minimum: 1.0 GHz @ 0.830 V
Stock: 2.3 GHz @ 1.010 V
OC'ed: 2.66 GHz @ 1.100 V
OC'ed: 3.00GHz @ 1.230 V
Stock: 2.3 GHz @ 0.960 V
AMD Athlon X2 4800+ - Brisbane (AM2) stock - 1.225V?
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.5 GHz @ 1.200 V
AMD Athlon 64 X2 5400+ - Brisbane (AM2, Rev. G2) - stock 1.325V
Minimum Voltages
Minimum: 1.0 GHz @ 0.775 V
Stock: 2.8 GHz @ 1.225 V
AMD X2 BE-2350 (AM2) stock - 1.25V
Warning: system wasn't stable, need more input from others
Minimum: 1.0 GHz @ 0.825 V
Stock: 2.1 GHz @ 1.000 V
AMD X2 4450e (AM2) stock - 1.25V
Minimum: 1.0 GHz @ 0.850 V
Stock: 2.3 GHz @ 1.100 V
Intel Pentium III-S (Tualatin) 1.26 GHz
1.36 GHz (142 MHz FSB) @ 1.45 V (stock voltage not adjustable on my mobo, processor multi is locked)
Intel Pentium M Dothan 1.0 GHz
Minimum: 0.6 GHz @ 0.700 V (lowest possible)
Stock: 1.0 GHz @ 0.748 V
Intel Pentium M Banias 1.3 GHz
Minimum: 0.6 GHz @ 0.796 V (original 0.956v)
Stock: 1.3 GHz @ 1.180 V (original 1.340v)
Intel Pentium M Banias 1.4 GHz
Minimum: 0.6 GHz @ 0.700 V
Stock: 1.4 GHz @ 1.100 V (original 1.484v)
Intel Pentium M Dothan 1.5 GHz
Minimum: 0,6 GHz @ 0.700 V (original 0.988v)
Stock: 1,5 GHz @ 0.972 V (stable at 0.940, I add two VIDs for daily use, original 1.340v)
Intel Pentium M 735 Dothan 1.7 GHz
Minimum: 0.6 GHz @ 0.700 V (lowest possible, original 0.988v?)
Stock: 1.7 GHz @ 1.004 V
Intel Pentium M 745 Dothan 1.8 GHz
Minimum: 0.6 GHz @ 0.716 V
Midway: 1.4 GHz @ 0.908
Intel Pentium M 760 Dothan 2.0 GHz
Minimum: 0.800 GHz @ 0.700 V - Note: lowest possible VID
Stock: 2.0 GHz @ 1.068 V (stock 1.356v)
Intel C2D Mobile T2500 - Yonah (479) stock - ?
Minimum: 1.0 GHz @ 0.950 V
Stock: 2.0 GHz @ 1.100 V
Intel C2D Mobile T5600 - Merom (479) stock - 1.15V
Minimum (SpeedStep, 1GHz): 1.0 GHz @ 0.850 V (lowest possible)
Stock: 1.83 GHz @ 0.870 V
Stock: 1.86 GHz @ 0.950 V - lowest possible VID
Intel C2D Mobile T7400 - Merom (479) stock -
Minimum: 1.0 GHz @ 0.975 V (it's locked, won't go lower)
Stock: 2.16 GHz @ 1.04 V
Intel C2D E2140 - M0 (775) stock - 1.325V
Stock: 1.6 GHz @ 0.925 V
OC'ed: 2.8 GHz @ 1.325 V
OC'ed: 3.0 GHz @ 1.400 V
All value come from bios setting.
Minimum: 1.2 GHz @ 0.825 V
Stock: 1.6 GHz @ 0.887 V
OC'ed: 2.66 GHz @ 1.187 V
Intel C2D E2160 - M0 (775) stock - 1.325V
Minimum: 1.4GHz @ 0.850 V
Intel C2D E4300 - B2 (775) stock - 1.35V
Stock: 1.8 GHz @ 1.000 V (motherboard limited)
OC'ed: 2.4 GHz @ 1.2125 V
OC'ed: 2.7 GHz @ 1.325 V
Intel C2D E6600 - Conroe (775) stock - ?V
Minimum: 1.6 GHz @ 1.136 V (Note: lowest possible VID)
Stock: 2.4 GHz @ 1.136 V
OC'ed: 2.76 GHz @ 1.136V (notes: same voltage as with speedstep at this frequency!!)
OC'ed: 3.1 GHz @ 1.340V (notes: overclocked to maximum stock voltage)
Minimum: Haven't tried
Stock: 2.4 GHz @ 1.000 V
OC'ed: 3.0 GHz @ 1.175 V
Intel C2D E6750 - Conroe (775) stock - 1.35V
Minimum: 2.0 GHz @ 1.187 V
Stock: 2.66 GHz @ 1.187 V
OC'ed: 2.8 GHz @ 1.212 V
OC'ed: 3.2 GHz @ 1.325 V
Intel Core 2 Quad Q6600 - Kentsfield (Rev B3, Stepping 7) stock - ?
Minimum:
Stock: 2.4 GHz @ 1.31250 V (Temps 70.0/51.0; 1.6 GHz speedstep)
Stock Minimum: 2.4 GHz @ 1.16875 V (Temps 62.8/48; 1.6 GHz speedstep)
Intel Core 2 Quad Q6600 - Kentsfield (Rev G0, Stepping 7) stock - 1.35V
Minimum:
Stock: 2.4 GHz @ 1.0375 V
Minimum: 2.0 GHz (333x6) @ 1.000 V
Intel Core 2 Quad Q9450 - Yorkfield (Rev C1) stock - 1.225V?
Minimum:
Stock: 2.66 GHz @ 0.99375 V
If you have any suggestions to improve this thread, please tell me.
Here's a tutorial. It's a bit outdated but still useful. There's also a lot of info to be found on this forum as well.
Programs for undervolting (and -clocking):
RMClock
CrystalCPUID
or for notebooks Notebook Hardware Control
Programs for stress testing (there are many others):
Prime95
Orthos
WARNING: Although CPUs of same type and stepping usual share the same undervolting options, there can always be individual discrepancies. The results shown below are indications.
We're looking for minimum voltage at minimum clock speed and minimum voltage at stock speed (with a stable system of course). Here's what we've got so far:
Athlon XP 2500+ - Barton (1.83GHz)
Stock: 1.87 GHz (11*170) @ 1.375 V (stock 1.60v)
AMD XP 2500+ - Mobile Barton stock - 1.45V
Minimum: 1.5 GHz @ 1.200 V
Stock: 1.83 GHz @ 1.3600 V
AMD Sempron 64 3000+ (754) stock - 1.4V
Minimum: 0.8 GHz @ 1.100 V (lowest possible, E6 stepping bug)
Stock: 1.8 GHz @ 1.150 V
OC: 2,3 GHz @ 1.400 V
AMD Athlon 64 3000+ - Clawhammer (754) stock - 1.5V
Minimum: 0.8 GHz @ 0.825 V
Stock: 2 GHz @ 1,375 V
AMD Athlon 64 3200+ - Newcastle (754) stock - 1.5V
Minimum:
Stock: 2.2 GHz @ 1.300 V
Turion ML-30 - Lancaster (754) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.6 GHz @ 0.925 V
AMD Athlon 64 3000+ - Winchester (939) stock - 1.4V
Stock: 1.8 GHz @ 1.104-1120 V
AMD Athlon 64 3200+ - Venice (939) stock - 1.35V
Minimum: 1.0 GHz @ 1.100 V (-> Vcore lock)
Stock: 2.0 GHz @ 1.125 V
Minimum: 1.0 GHz @ 1.100 V (-> Vcore lock)
Stock: 2.0 GHz @ 1.125 V
OC'ed: 2.25 GHz @ 1.275 V
OC'ed: 2.5 GHz @ 1.425 V
AMD Athlon 64 3500+ - Venice (939) stock - 1.35V
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.2 GHz @ 1.175 V
OC'ed: 2.7 GHz @ 1.325 V
AMD Athlon X2 4600+ - Manchester (939) stock - 1.35V
Minimum: 1.0 GHz @ 1.100 V (Note: lowest possible VID)
Stock: 2.4 GHz @ 1.225 V
AMD Opteron 165 - Denmark (939) stock - 1.35V
Minimum: 1.1 GHz @ 0.825 V
Stock: 1.8 GHz @ 1.000 V
OC'ed: 2.5 GHz @ 1.250 V
AMD Opteron 170 - Denmark (939) stock - 1.35V
Stock: 2.0 GHz @ 1.100 V
AMD Opteron 185 - Denmark (939) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 2.6 GHz @ 1.200 V
AMD Athlon 64 3000+ - Winchester (AM2) stock - 1.4V
Minimum: 1.0 GHz @ 1,1 V
Stock: 1.8 GHz @ 1,175 V
AMD Athlon 64 3000+ - Orleans (AM2, Revision F2) stock - 1.4V
Minimum: 1.0 GHz @ 0.825 V
Stock: 1.8 GHz @ 1.100 V
AMD Sempron 64 3200+ - Manila (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.8 GHz @ 1.000 V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.8 GHz @ 0.900 V (not thoroughly tested)
AMD Sempron 64 3400+ (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.8 GHz @ 1.000 V
AMD Sempron LE-1100 - Sparta (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.9 GHz @ 0.950 V (12 hrs Orthos)
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.9 GHz @ 1.000 V
AMD Sempron LE-1250 - Sparta (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 2.2 GHz @ 0.975 V
AMD Athlon 64 3500+ - Orleans (AM2, Rev. F2) stock - 1.35V
Minimum: 1.0 GHz @ 0.900 V
Stock: 2.2 GHz @ 1.100 V
AMD Athlon 64 3500+ - Lima (AM2) stock - 1.35V
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.2 GHz @ 1.025 V
AMD Athlon X2 3600+ - Windsor (AM2) stock - 1.25V?
Minimum: 1.0 GHz @ 0.900 V
Stock: 2.0 GHz @ 1.075 V
AMD Athlon X2 3600+ - Brisbane (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.800 V
Stock: 1.9 GHz @ 1.000 V
Minimum: 1.0 GHz @ 0.825 V
Stock: 1.9 GHz @ 1.000 V
AMD Athlon X2 3800+ - Windsor (AM2) stock - 1.35V
Minimum: 0.8 GHz @ 0.900 V
Stock: 2.0 GHz @ 1.125 V
OC'ed (sort of): 2.3 GHz @ 1.275 V
Minimum: 1 GHz @ 0.800 V
1.6 GHz (Crystal CPUID): 1.6 GHz @ 0.900 V
Stock: 2.0 GHz @ 0.975 V
AMD Athlon X2 4000+ - Brisbane (AM2) stock - 1.35V
Minimum: 1.0 GHz @ 0.856 V
Stock: 2.1 GHz @ 1.031 V
Minimum: 1.0 GHz @ 0.864 V
Stock: 2.1 GHz @ 1.056 V
AMD Athlon X2 4200+ - Windsor (AM2) stock - 1.25V
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.2 GHz @ 1,125 V
AMD Athlon X2 4400+ - Brisbane (AM2, Rev. G2) stock - 1.3V
Minimum: 1.0 GHz @ 0.830 V
Stock: 2.3 GHz @ 1.010 V
OC'ed: 2.66 GHz @ 1.100 V
OC'ed: 3.00GHz @ 1.230 V
Stock: 2.3 GHz @ 0.960 V
AMD Athlon X2 4800+ - Brisbane (AM2) stock - 1.225V?
Minimum: 1.0 GHz @ 0.800 V
Stock: 2.5 GHz @ 1.200 V
AMD Athlon 64 X2 5400+ - Brisbane (AM2, Rev. G2) - stock 1.325V
Minimum Voltages
Minimum: 1.0 GHz @ 0.775 V
Stock: 2.8 GHz @ 1.225 V
AMD X2 BE-2350 (AM2) stock - 1.25V
Warning: system wasn't stable, need more input from others
Minimum: 1.0 GHz @ 0.825 V
Stock: 2.1 GHz @ 1.000 V
AMD X2 4450e (AM2) stock - 1.25V
Minimum: 1.0 GHz @ 0.850 V
Stock: 2.3 GHz @ 1.100 V
Intel Pentium III-S (Tualatin) 1.26 GHz
1.36 GHz (142 MHz FSB) @ 1.45 V (stock voltage not adjustable on my mobo, processor multi is locked)
Intel Pentium M Dothan 1.0 GHz
Minimum: 0.6 GHz @ 0.700 V (lowest possible)
Stock: 1.0 GHz @ 0.748 V
Intel Pentium M Banias 1.3 GHz
Minimum: 0.6 GHz @ 0.796 V (original 0.956v)
Stock: 1.3 GHz @ 1.180 V (original 1.340v)
Intel Pentium M Banias 1.4 GHz
Minimum: 0.6 GHz @ 0.700 V
Stock: 1.4 GHz @ 1.100 V (original 1.484v)
Intel Pentium M Dothan 1.5 GHz
Minimum: 0,6 GHz @ 0.700 V (original 0.988v)
Stock: 1,5 GHz @ 0.972 V (stable at 0.940, I add two VIDs for daily use, original 1.340v)
Intel Pentium M 735 Dothan 1.7 GHz
Minimum: 0.6 GHz @ 0.700 V (lowest possible, original 0.988v?)
Stock: 1.7 GHz @ 1.004 V
Intel Pentium M 745 Dothan 1.8 GHz
Minimum: 0.6 GHz @ 0.716 V
Midway: 1.4 GHz @ 0.908
Intel Pentium M 760 Dothan 2.0 GHz
Minimum: 0.800 GHz @ 0.700 V - Note: lowest possible VID
Stock: 2.0 GHz @ 1.068 V (stock 1.356v)
Intel C2D Mobile T2500 - Yonah (479) stock - ?
Minimum: 1.0 GHz @ 0.950 V
Stock: 2.0 GHz @ 1.100 V
Intel C2D Mobile T5600 - Merom (479) stock - 1.15V
Minimum (SpeedStep, 1GHz): 1.0 GHz @ 0.850 V (lowest possible)
Stock: 1.83 GHz @ 0.870 V
Stock: 1.86 GHz @ 0.950 V - lowest possible VID
Intel C2D Mobile T7400 - Merom (479) stock -
Minimum: 1.0 GHz @ 0.975 V (it's locked, won't go lower)
Stock: 2.16 GHz @ 1.04 V
Intel C2D E2140 - M0 (775) stock - 1.325V
Stock: 1.6 GHz @ 0.925 V
OC'ed: 2.8 GHz @ 1.325 V
OC'ed: 3.0 GHz @ 1.400 V
All value come from bios setting.
Minimum: 1.2 GHz @ 0.825 V
Stock: 1.6 GHz @ 0.887 V
OC'ed: 2.66 GHz @ 1.187 V
Intel C2D E2160 - M0 (775) stock - 1.325V
Minimum: 1.4GHz @ 0.850 V
Intel C2D E4300 - B2 (775) stock - 1.35V
Stock: 1.8 GHz @ 1.000 V (motherboard limited)
OC'ed: 2.4 GHz @ 1.2125 V
OC'ed: 2.7 GHz @ 1.325 V
Intel C2D E6600 - Conroe (775) stock - ?V
Minimum: 1.6 GHz @ 1.136 V (Note: lowest possible VID)
Stock: 2.4 GHz @ 1.136 V
OC'ed: 2.76 GHz @ 1.136V (notes: same voltage as with speedstep at this frequency!!)
OC'ed: 3.1 GHz @ 1.340V (notes: overclocked to maximum stock voltage)
Minimum: Haven't tried
Stock: 2.4 GHz @ 1.000 V
OC'ed: 3.0 GHz @ 1.175 V
Intel C2D E6750 - Conroe (775) stock - 1.35V
Minimum: 2.0 GHz @ 1.187 V
Stock: 2.66 GHz @ 1.187 V
OC'ed: 2.8 GHz @ 1.212 V
OC'ed: 3.2 GHz @ 1.325 V
Intel Core 2 Quad Q6600 - Kentsfield (Rev B3, Stepping 7) stock - ?
Minimum:
Stock: 2.4 GHz @ 1.31250 V (Temps 70.0/51.0; 1.6 GHz speedstep)
Stock Minimum: 2.4 GHz @ 1.16875 V (Temps 62.8/48; 1.6 GHz speedstep)
Intel Core 2 Quad Q6600 - Kentsfield (Rev G0, Stepping 7) stock - 1.35V
Minimum:
Stock: 2.4 GHz @ 1.0375 V
Minimum: 2.0 GHz (333x6) @ 1.000 V
Intel Core 2 Quad Q9450 - Yorkfield (Rev C1) stock - 1.225V?
Minimum:
Stock: 2.66 GHz @ 0.99375 V
If you have any suggestions to improve this thread, please tell me.
Last edited by Palindroman on Mon Apr 14, 2008 12:49 am, edited 24 times in total.
AMD Opteron 165 - Denmark (939) stock - 1.35V
low: 1.1GHz @ 0.825V
Stock: 1.8GHz @ 1.000V
OC'ed: 2.5GHz @ 1.250V
My sugesstion, as I listed, is to add successful OVERCLOCK & UNDERVOLT settings. As you can see, I would be my power expense would be 25% higher with the OC above, but my productivity would rise by an even larger amount - 38%. Therefore, while my power bill would be higher with the OC, my contribution to folding@home would outweigh the expense.
low: 1.1GHz @ 0.825V
Stock: 1.8GHz @ 1.000V
OC'ed: 2.5GHz @ 1.250V
My sugesstion, as I listed, is to add successful OVERCLOCK & UNDERVOLT settings. As you can see, I would be my power expense would be 25% higher with the OC above, but my productivity would rise by an even larger amount - 38%. Therefore, while my power bill would be higher with the OC, my contribution to folding@home would outweigh the expense.
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this is the same mentality I've been using. I'm trying to find a balance between WU frame time and power consumption. But I'm also limited because I want to run my chip fanless, so I'm almost at the thermal limit, I really want to stay with a 2-fan system.miahallen wrote:As you can see, I would be my power expense would be 25% higher with the OC above, but my productivity would rise by an even larger amount - 38%. Therefore, while my power bill would be higher with the OC, my contribution to folding@home would outweigh the expense.
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Thanks for the results, everyone!
Is 0.975 the stock voltage for the T7400? Or is that with Speedstep enabled?b3nbranch wrote:Intel C2D Mobile (Merom) T7400
stock idle freq/volt: 1.0 GHz @ 0.975v
stock busy freq/volt: 2.16 GHz @ 1.21v
undervolt idle: 1.0 GHz @ 0.975v (it's locked, won't go lower)
undervolt busy: 2.16 GHz @ 1.04v
am not overclocking.
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I've got my Opteron 185 running at 0.8V at 800MHz in its idle mode, and 1.2V @ 2.6GHz under full load. (Stock is 1.35V at full load, 1.1V @ 1GHz in idle.) It's rock solid at both of these extremes, but the 800MHz setting only works if you also reduce the HT speed to 800MHz (default is 1GHz) in the BIOS.
At stock voltage (1.35V) I've overclocked it to just over 3.0GHz. Much faster than that it gets unstable; I haven't tried raising the voltage to push it further.
At stock voltage (1.35V) I've overclocked it to just over 3.0GHz. Much faster than that it gets unstable; I haven't tried raising the voltage to push it further.
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AMD Opteron 165 - (S939) stock - 1.35V
2.5Ghz @ 1.350V
1.8Ghz @ 1.050V
1.1Ghz @ 0.900v
AMD Athlon X2 3600+ - Brisbane (AM2) stock - 1.35V
2.7Ghz @ 1.275V
2.0Ghz @ 1.025V
1.3Ghz @ 0.850V
AMD Athlon X2 3600+ - Brisbane (AM2) stock - 1.35V
2.4Ghz @ 1.275V
1.9Ghz @ 1.000V
1.3Ghz @ 0.900V
1.0Ghz @ 0.800V
2.5Ghz @ 1.350V
1.8Ghz @ 1.050V
1.1Ghz @ 0.900v
AMD Athlon X2 3600+ - Brisbane (AM2) stock - 1.35V
2.7Ghz @ 1.275V
2.0Ghz @ 1.025V
1.3Ghz @ 0.850V
AMD Athlon X2 3600+ - Brisbane (AM2) stock - 1.35V
2.4Ghz @ 1.275V
1.9Ghz @ 1.000V
1.3Ghz @ 0.900V
1.0Ghz @ 0.800V
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Well, speedstep has been abled since the first boot, so I'm surePalindroman wrote:Thanks for the results, everyone!
Is 0.975 the stock voltage for the T7400? Or is that with Speedstep enabled?
that's what the 0.975 thing is. I'm sure it could go lower than that
at 1.0 GHz, but it's locked in the sense that the CPU ignores requests
for a VID less than that.
Interesting results I've seen:
Pentium M Dothan - 1.3v?
1.5ghz @ 0.908v
1ghz @ 0.716v
600mhz @ 0.7v
Turion ML-30 - 1.35v
1.6ghz @ 0.925v
800mhz @ 0.8v
Athlon64 x2 4000+ Windsor AM2 - 1.35v
2.7ghz @ 1.35v
2.0ghz @ 1.1v
Haven't tried lower than 1.35ghz/1.1v because the fan turns off already, don't see a point.
Pentium M Dothan - 1.3v?
1.5ghz @ 0.908v
1ghz @ 0.716v
600mhz @ 0.7v
Turion ML-30 - 1.35v
1.6ghz @ 0.925v
800mhz @ 0.8v
Athlon64 x2 4000+ Windsor AM2 - 1.35v
2.7ghz @ 1.35v
2.0ghz @ 1.1v
Haven't tried lower than 1.35ghz/1.1v because the fan turns off already, don't see a point.
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I've updated the results, but please post only the minimum voltages at which your system is stable. It's the extremes we want to know here.
What is the stock voltage of this one, do you know? There Orleans-core Athlons with different power envelopes, I believe.AMD Athlon 64 3500+ - Orleans (AM2)
Minimum: 1.0GHz @ .925V
Stock: 2.2GHz @ 1.150V
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Thanks, I've added your results.
If I may ask, how come the Meroms don't go below a 0.950v (T5600) and 0.975 (T7400) respectively. According to this site it should be able to vary between 0.75~1.3V.
If I may ask, how come the Meroms don't go below a 0.950v (T5600) and 0.975 (T7400) respectively. According to this site it should be able to vary between 0.75~1.3V.
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