Cool-n-Quiet Athlon 64 Motherboards

CPUs|Motherboards
  • April 7, 2005 - Major update by Joachim Kluge to reflect recent development and socket-939
  • Nov 15, 2004 - Updates and additions, thanks to Joachim Kluge
  • July 7, 2004 - Minor updates and corrections
  • June 25, 2004 - First published

Cool 'n' Quiet is a feature in AMD Athlon 64 that reduces the working frequency and Vcore when the processor is not under heavy load in order to lower the heat dissipation. This feature has never appeared in desktop CPUs before, though it has been used in mobiles to save on battery power for a while under the name PowerNow! for AMD and SpeedStep for Intel. The power saving is quite significant - examples are shown in this post. When combined with an intelligent thermal fan control mechanism (either built into the motherboard or external to it), C'n'Q can be an quick and easy way to make a quiet, very powerful PC. It also reduces electricity consumption, a worthy cause in our age.

C'n'Q requires BIOS support in the motherboard. Only a few early socket-754 mainboards supported C'n'Q. The situation has become better with further development of the platform. Especially the socket-939 platform offers now very good support.

The information about C'n'Q-supported motherboards in the table below was painstakingly compiled by by Joachim Kluge, who many of you may know as jojo4u in the SPCR Forums. It came from many sources, which are cited. Joachim is also responsible for starting the forum thread, Athlon 64 power reduction: C'n'Q, Vcore, mobile, tools, which contains extensive information on the topic.

A few details to note:

  • There are known problems with socket-754 boards and 2+ DIMMS. You can find compatibility notes on some boards below. You can also ask in the forum if someone has a stable operation with 2 DIMMs. According to Aopen, 3 DIMM configurations are incompatible with C'n'Q.
  • C'n'Q sets the speed and the voltage to defined levels. If you are unsatified with these levels, please refer to this more detailed post.
  • Enabling C'n'Q in the BIOS may help to unblock multiplier and voltage adjustments with tweak utilities under Windows.
  • AMD has improved the Athlon 64 from time to time. For low power use it is best to get a 90nm core. On socket-939 there is the "Winchester" core available. The TDP is 67W and the OPN ends with -BI. If you can't get a 90nm core, try to get at least the 130nm "CG-stepping" core.
  • Given the ridiculously accelerated lifecycle of motherboards, it is very difficult to keep a product database such as this up to date. Products get revised, dropped or replaced, all without notice. Please help by posting any relevant information in this thread: Athlon 64 power reduction: C'n'Q, Vcore, mobile, tools.
CnQ Mainboards
Socket
Size Chipset Notes Info Source Date
Socket-754 boards
Abit KV8 Pro 754 ATX VIA K8T800 reliable with 2 DIMMs since rev 1.1 / fan control down to 8V/ BIOS has no undervolting options hardwareluxx.de 24.06.04
Abit NF8 series 754 ATX nVidia nForce3 250GB
AMD, Abit-usa 30.03.05
Abit KV-80 754 ATX VIA K8M800
Abit-usa 31.03.05
Albatron K8Ultra-U Pro 754 ATX ULi M1689
AMD 30.03.05
Albatron K8X800 Pro II 754 ATX VIA K8T800
hardwareluxx.de 24.06.04
Aopen AK86 754 ATX VIA K8T800 SilentTek able to stop fan at idle / reliable C'n'Q only with one memory stick C't 24.06.04
Aopen AK86-L 754 ATX VIA K8T800 SilentTek able to stop fan at idle / controls only 1 fan / reliable C'n'Q only with one memory stick anandtech.com, planet3dnow.de 24.06.04
Aopen AK89 Max 754 ATX nVidia nForce3 150 newest BIOS/ not officially supported /SilentTek able to stop fan at idle / controls only 1 fan / Aopen: reliable C'n'Q only with one memory stick SPCR-Forum 22.08.04
AOpen S760GXm-SL 754 µATX SiS 760GX
AMD 30.03.05
ASRock K8 Combo-Z 754/939 ATX ULi M1689 lowest C'n'Q voltage only 1.3V planet3dnow.de 30.03.05
Asrock K8S8X 754 ATX SiS 755 reliable with 2 DIMMs hardtecs4u.de, planet3dnow.de 27.07.04
Asrock K8Upgrade-760GX 754 µATX SiS 760GX
AMD 30.03.05
Asus K8N 754 ATX nForce3 250 fan control down to 4V C't 30.03.05
Asus K8N-E Deluxe 754 ATX nForce3 250GB BIOS has no undervolting options / Qfan2 (not clear if able to stop fans) hardwareluxx.de, Asus 10.08.04
Asus K8N4-E Deluxe 754 ATX nVidia nForce4 4X
Asus 30.03.05
Asus K8S-MX 754 ATX SiS 760GX
Asus 30.03.05
Asus K8V / K8V-X 754 ATX VIA K8T800
Asus 30.03.05
Asus K8V Deluxe 754 ATX VIA K8T800 fan control able to stop fan at idle / controls only 1 fan / reliable with 2 DIMMs C't, planet3dnow.de, hardwareluxx.de 24.06.04
Asus K8V Deluxe SE 754 ATX VIA K8T800
SPCR-Forum 30.03.05
Asus K8V-MX 754 µATX VIA K8M800
AMD 30.03.05
Biostar K8NBP 754 other nVidia nForce3 150
AMD 24.06.04
Biostar K8NHA-M 754 µATX nVidia nForce3 150
AMD 24.06.04
Biostar K8NHA-M Grand 754 µATX nVidia nForce3 250 C't 30.03.05
Biostar K8NHA-Pro 754 ATX nVidia nForce3 150
AMD 24.06.04
Biostar K8VHA 754 ATX VIA K8T800
C't 24.06.04
Biostar K8VHA 754 ATX VIA K8T800
C't 24.06.04
Biostar K8VHA Pro 754 ATX VIA K8T800
AMD 24.06.04
Chaintech ZNF3-150 754 ATX nVidia nForce3 150 no BIOS switch, activated by default hardwareluxx.de 24.06.04
DFI K8M800-MLV 754 µATX VIA K8M80
AMD 30.03.05
DFI K8T800Pro-ALF 754 ATX VIA K8T800 Pro
AMD 30.03.05
DFI LANParty UT nF3 250Gb 754 ATX nVidia nForce3 250
hardwareluxx.de, SPCR-Forum 30.03.05
ECS 755-A2 754 ATX SiS 755 reliable with 2 DIMMs AMD, hardtecs4u.de 27.07.04
ECS 755-M 754 µATX SiS 755
AMD 24.06.04
ECS 760-M 754 µATX SiS 760
AMD 30.03.05
ECS 760GX-M 754 µATX SiS 760GX
AMD 30.03.05
ECS K8M800-M 754 µATX VIA K8M800
AMD 30.03.05
ECS K8T800-M 754 ATX VIA K8T800
AMD 24.06.04
Epox EP-8HDA3+ 754 ATX VIA K8T800
AMD, C't, Epox 24.06.04
Epox EP-8HDA3I 754 ATX VIA K8T800
Epox 30.03.05
Epox EP-8HDA5+ 754 ATX VIA K8T800
Epox 30.03.05
Epox EP-8HDA5I 754 ATX VIA K8T800
Epox 30.03.05
Epox EP-8HDA5J 754 ATX VIA K8T800
Epox 30.03.05
Epox EP-8HDAI PRO 754 ATX VIA K8T800
Epox 30.03.05
Epox EP-8HMMI-A 754 ATX VIA K8M800
Epox 30.03.05
Epox EP-8KDA3+ 754 ATX nVidia nForce3 250GB reliable with 2 DIMMs hardtecs4u.de:1,2, Epox 24.06.04
Epox EP-8KDA3+ PRO 754 ATX nVidia nForce3 250Gb
Epox 30.03.05
Epox EP-8KDA3I 754 ATX nVidia nForce3 250
Epox 30.03.05
Epox EP-8KDA3J 754 ATX nVidia nForce3 250Gb
Epox 30.03.05
Epox EP-8KDA7I 754 ATX nVidia nForce3 250
Epox 30.03.05
Epox EP-8NPAJ 754 ATX nForce4 4X
Epox 30.03.05
Epox EP-9NDA3I 754 ATX nVidia nForce3 250
Epox 30.03.05
FIC K8M-800M 754 ATX K8M800
AMD 24.06.04
Fujitsu-Siemens D1607 754 ATX VIA K8T800 fan control able to stop fan at idle C't 24.06.04
Gigabyte GA-K8NS Pro 754 ATX nVidia nForce3 250 reliable C'n'Q only with one memory stick hardtecs4u.de 30.03.05
Gigabyte GA-K8S760M 754 µATX SiS760LV
AMD 24.06.04
Gigabyte GA-K8S760M 754 µATX SiS 760
AMD 30.03.05
Gigabyte GA-K8VM800M 754 µATX K8M800
AMD 24.06.04
Gigabyte GA-K8VM800M 754 µATX VIA K8M800
AMD 30.03.05
Gigabyte K8NNXP 754 ATX nForce3 150 no BIOS switch: activated by default / reliable with 2 DIMMs hardwareluxx.de, C't 24.06.04
Gigabyte K8NSNXP 754 ATX nForce3 250 no BIOS switch: activated by default / reliable C'n'Q only with one memory stick hardwareluxx.de 09.07.04
Gigabyte K8VNXP 754 ATX VIA K8T800 no BIOS switch: activated by default hardwareluxx.de 24.06.04
Gigabyte K8VT800M 754 µATX VIA K8T800 no temperature protection! AMD 24.06.04
MSI K8M Neo-V 754 ATX VIA K8M800
SPCR-Forum, MSI 30.03.05
MSI K8MM-ILSR 754 µATX VIA K8M800
MSI 30.03.05
MSI K8N Neo series 754 ATX nForce3 250GB works with 2 memory sticks / fan control down to 5V SPCR-Forum:1,2, MSI 24.06.04
MSI K8N Neo3 754 ATX nVidia nForce4-4X
MSI 30.03.05
MSI K8T Neo series 754 ATX VIA K8T800 works with 2 memory sticks C't, tomshardware.de, SPCR-Forum, MSI 24.06.04
MSI K8T Neo-V 754 ATX VIA K8T800
MSI 30.03.05
MSI K8TM-ILSR 754 µATX VIA K8T800
MSI 30.03.05
MSI MS-6741G 754 µATX VIA K8M800
AMD 30.03.05
MSI RS480M2-IL 754 ATX ATI Radeon Xpress 200P
AMD 30.03.05
PC Chips W32 754 ATX SiS 755
AMD 30.03.05
Shuttle AN50R 754 ATX nForce3 150 reliable C'n'Q only with one memory stick hardtecs4u.de 24.06.04
Shuttle AN51R 754 ATX nForce3 250 reliable C'n'Q only with one memory stick hardwareluxx.de 09.07.04
Shuttle FN85 754 SFF nVidia nForce3 250GB
AMD 30.03.05
Shuttle FX83 (1.5) 754 other K8M800
AMD 24.06.04
Soltek K890Pro-754 754 µATX VIA K8T890
AMD 30.03.05
Soltek K8AN-RL 754 ATX nVidia nForce3 150 no BIOS switch: activated by default / reliable with 2 DIMMs hardwareluxx.de 24.06.04
Soltek SL-K8AN2E-GR 754 ATX nVidia nForce3 250GB
AMD 30.03.05
Soltek SL-K8AV2-RL 754 ATX VIA K8T800
AMD 24.06.04
Soltek SL-K8AV2-RL 754 ATX VIA K8T800
AMD 30.03.05
Uneec MK8V 2.0 754 other VIA K8T800
AMD 30.03.05
WinFast 760GXK8MB 754 µATX SiS 760GX
AMD 30.03.05
WinFast K8S755M 754 µATX SiS 755
AMD 30.03.05
WinFast K8S760MG 754 µATX SiS 760
AMD 30.03.05
Socket-939 boards
Abit AV8 939 ATX VIA K8T800 Pro fan control down to ~60% hardwareluxx.de, AMD, hardtecs4u.com 24.06.04
Abit AN8 series 939 ATX nVidia nForce4
Abit-usa 31.03.05
Abit AX8 series 939 ATX VIA K8T890
Abit-usa 31.03.05
ASRock K8 Combo-Z 754/939 ATX ULi M1689 lowest C'n'Q voltage only 1.3V planet3dnow.de 30.03.05
Asus A8N-E 939 ATX nVidia nForce4 Ultra
Asus 30.03.05
Asus A8N-SLI 939 ATX nVidia nForce4 SLI
Asus 30.03.05
Asus A8N-SLI Deluxe 939 ATX nVidia nForce4 SLI
AMD, hardtecs4u.de, hardwareluxx.de 30.03.05
Asus A8V Deluxe 939 ATX VIA K8T800 Pro fan control down to ~60% hardwareluxx.de, AMD, Asus, hardtecs4u.com 24.06.04
Asus A8V-E Deluxe 939 ATX VIA K8T890
AMD, Asus 30.03.05
DFI nF4 Ultra-D 939 ATX nVidia nForce4 Ultra
SPCR-Forum 30.03.05
ECS KV2 939 ATX VIA K8T800 Pro
AMD 24.06.04
Epox EP-9NDA3+ 939 ATX nForce3 Ultra
Epox 30.03.05
Epox EP-9NDA3+ 939 ATX nVidia nForce3 Ultra
AMD 30.03.05
Epox EP-9NDA3J 939 ATX nForce3 Ultra
Epox 30.03.05
Epox EP-9NPA+ (SLI) 939 ATX nVidia nForce4 Ultra/SLI
Epox 30.03.05
Epox EP-9NPAJ 939 ATX nVidia nForce4
Epox 30.03.05
Foxconn NF4K8MC-ERS 939 µATX nVidia nForce4 SPCR-Forum 02.04.05
Gigabyte GA-K8N Ultra-9 939 ATX nVidia nForce4 Ultra
SPCR-Forum 30.03.05
Gigabyte GA-K8NF-9 939 ATX nVidia nForce4
AMD 30.03.05
Gigabyte GA-K8NS Ultra-939 939 ATX nVidia nForce3 Ultra
AMD 30.03.05
Gigabyte GA-K8NS-939 939 ATX nVidia nForce3 Ultra
AMD 30.03.05
Gigabyte GA-K8NSNXP939 939 ATX nVidia nForce3 250GB
AMD 30.03.05
Gigabyte GA-K8NSNXP939 939 ATX nForce3 Ultra
AMD 24.06.04
Gigabyte GA-K8NXP -9/-SLI 939 ATX nVidia nForce4 Ultra/SLI no BIOS switch: activated by default AMD, hardwareluxx.de:1,2, C't 30.03.05
Gigabyte GA-K8VNXP939 939 ATX VIA K8T800 Pro
AMD 30.03.05
MSI K8N Neo2 series 939 ATX nVidia nForce3 (Ultra ) fan control down to 5V AMD, MSI, planet3dnow.de, hardwareluxx.de 24.06.04
MSI K8N Neo4 series 939 ATX nVidia nForce4 (Ultra)
AMD, MSI 30.03.05
MSI K8N SLI Platinum / K8N Diamond (MS-7100) 939 ATX nVidia nForce4 SLI
AMD, MSI, C't 30.03.05
MSI K8T Neo2 (MSI 6702E) 939 ATX VIA K8T800 Pro
hardwareluxx.de, MSI, AMD 28.07.04
MSI RX480M2 (7093) 939 µATX ATI Radeon Xpress 200P
AMD, SPCR-Forum, hardwareluxx.de 30.03.05
Shuttle FN95 939 SFF nVidia nForce3 Ultra
AMD, hardwareluxx.de 30.03.05
Soltek SL-K890Pro-939 939 ATX VIA K8T890 SPCR-Forum 04.04.05
Soltek SL-B9D-FGR ( Qbic EQ3901-300P) 939 SFF VIA K8T800 Pro
SPCR-Forum 30.03.05
Soltek SL-K8TPro-939 939 ATX VIA K8T800 Pro
AMD 30.03.05
WinFast 755FXK8AA 939 ATX SiS 755
AMD 30.03.05

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