Barton 2500 @ 1.1v?

PhilgB · Post by **PhilgB** » Sat Jan 17, 2004 6:51 am

I think I remember someone saying that the bartons are all (multiplier) unlocked. Can anyone confirm this? If so, I would like to get one and try and get it running at 1.1v. How much would I have to underclock it to get it running at that voltage? Has anyone tried this?

GenghiS_KhaN · Post by **GenghiS_KhaN** » Sat Jan 17, 2004 6:58 am

why would you be wanting it to run at 1.1V and not something else?
I run it at 1.425V and I currently have 24 case, 28 cpu, in idle...
When stressed the cpu is 37 (Prime95) and 28-30 casetemps.
I know I'm using a coolermaster casefan to cool the cpu running at 12V but I'm sure I can use the fan at 7V....

TheScarf · Post by **TheScarf** » Sat Jan 17, 2004 7:00 am

Bartons are deinitely NOT all overclocked

I think it was before week 30 in production that they were unlocked, not quite sure, but I have one of each. I looked around for a second older one but no luck....

PhilgB · Post by **PhilgB** » Sat Jan 17, 2004 7:19 am

TheScarf wrote:deinitely NOT all overclocked

Well i think you meant unlocked.. but thanks. Ill find out which ones are unlocked and keep an eye out for one.

@Genghis
Im just aiming for a dead silent pc. I tried it with a 5V L1A on CPU and for exhaust and temps went up to 60degC in no time (MCX462+). At 12V I can hear more than just airflow. Hopefully get the same performance as my 2200 right now, just running a whole lot cooler.

Im going to foam the inside and build a custom PC stand/muffler setup (prototype looks sweet!) Should get some really good results.

TheScarf · Post by **TheScarf** » Sat Jan 17, 2004 7:31 am

Oops, you're right, meant not all bartons are unlocked, but all bartons should be overclocked anyway!! My unlocked overclocked one folds 95% of the time and maxes out in the high 40's with an undervolted Zalman 7000 AlCu doing a quiet job of it.

PhilgB · Post by **PhilgB** » Sat Jan 17, 2004 8:11 am

Well its just an experiment. I wish I could boot to different bios profiles

I dont need much performance when Im browsing the net or coding. I guess well see when I try it.

PhilgB · Post by **PhilgB** » Sat Jan 17, 2004 1:48 pm

The barton doesnt cost that much and I have another use for the 2200 that doesnt require silence. The board I have right now doesnt undervolt or anything so when I get my NF7-S Ill play around with it.

silvervarg · Post by **silvervarg** » Sun Jan 18, 2004 5:58 am

Bartons was unlocked up to 2003 week 39. After that I think they are all locked. It is however possible to unlock them by modifying the bridges. There are good detailed manuals for this with great pictures.

I have been running my Barton 2500+ at 1.1 volt when undervolted.
I have not really pushed hard to find the limit of how high speed you can go with 1.1V, but at least 1.0GHz seems fine.
I have done some tests with 1.1V at 1260MHz (7*180) and that seems to be ok.

1.1V seems to be close to the limit on what the CPU likes, so it can be pushed quite a bit further on 1.125V.
I will go compleatly fanless, so this is the main reason that I want to push the Vcore really low.
You can run stock speed 1826MHz at around 1.425V.
Dropping slightly in speed you will be able to drop voltage to ~1.3V very quickly.

PhilgB · Post by **PhilgB** » Wed Jan 21, 2004 7:35 am

Silvervarg,
Is your fanless setup going to be heatpipe>massive heatsink? Or something else? I have been wanting to try this on my server, so please post your results if you do try this. Thanks.

oogabooga · Post by **oogabooga** » Wed Jan 21, 2004 12:44 pm

silvervarg wrote: Dropping slightly in speed you will be able to drop voltage to ~1.3V very quickly.

Heck, I'm able to get my Barton 2500 to 1.3V *at* stock speed - temps are 40/47, case is ~25, using a modded Silent Boost with an L1A at ~6V (fanmate)! Mind you, I do have two L1A case fans at 6V that are blowing cool air onto the HS.

Also, (and I haven't tried this), but does anyone know how good the temps get if you simply lower the FSB but keep the multiplier at 11x (for those of us with locked Bartons?) It could be an effective trick to get to the fanless range - 11X100 = 1.1Ghz, not bad... (or 11X66 = 726MHz, not great, but plenty for internet, office, winamp, etc).

Sameer

PhilgB · Post by **PhilgB** » Wed Jan 21, 2004 2:02 pm

I noticed a whopping 0degC change in temp when switching from 133 to 100 FSB (266>200) on my AthlonXP 2200.

marc999 · Post by **marc999** » Wed Jan 21, 2004 3:33 pm

What motherboards are you guys using to undervold your Bartons?
I looked into undervolting mine, but my ASUS A7N8X-X (NForce 2 chipset) won't let me.

I wonder if I write ASUS if they'll add it in their next BIOS release?!

oogabooga · Post by **oogabooga** » Wed Jan 21, 2004 4:16 pm

marc999 wrote:What motherboards are you guys using to undervold your Bartons?
I looked into undervolting mine, but my ASUS A7N8X-X (NForce 2 chipset) won't let me.
I wonder if I write ASUS if they'll add it in their next BIOS release?!

I use the SOLTEK FRN2 board - it's the best budget board I have ever owned. Sells for about $100. Can be gotten from NCIX. Undervolts to 1.1, huge clock range, auto-CPU shutoff above a certain temp, ability to read CPU diode, nForce 2 U400, blah blah blah. Easily worked when I OC'd the barton 2500 to 3200. About the only thing it can't do that I want is onboard fan control through software (i.e using Speedfan).

PhilgB · Post by **PhilgB** » Wed Jan 21, 2004 4:23 pm

Barely any Asus boards allow undervolting. My ECS K7S5A doesnt undervolt either but I plan on getting the Abit NF7-S.

silvervarg · Post by **silvervarg** » Thu Jan 22, 2004 2:53 am

Heck, I'm able to get my Barton 2500 to 1.3V *at* stock speed - temps are 40/47, case is ~25, using a modded Silent Boost with an L1A at ~6V (fanmate)! Mind you, I do have two L1A case fans at 6V that are blowing cool air onto the HS.

Do you pass at least 1 hour of prime95 torture test on 1.3V stock speed without errors?
I don't think I have tried that setting on my Barton 2500, but I don't think it will pass without errors.

Also, (and I haven't tried this), but does anyone know how good the temps get if you simply lower the FSB but keep the multiplier at 11x (for those of us with locked Bartons?) It could be an effective trick to get to the fanless range - 11X100 = 1.1Ghz, not bad... (or 11X66 = 726MHz, not great, but plenty for internet, office, winamp, etc).

You get the most benefit of lowered heat when lowering the Vcore. Assuming you run with a constant Vcore your heat will be directly proportional to the MHz you are running. So it is really multiplier*FSB that matters. That means that lowering the FSB will help quite a lot in reducing the heat.
I have noticed some instability when going real low in FSB at some settings, but this might have to do with my memory timings or similar things.
I have no problem running in the 1.0GHz range with the CPU fan turned off (stock DP-102 cooler) and running prime95 forever.

marc999 · Post by **marc999** » Thu Jan 22, 2004 7:24 am

My ECS K7S5A doesnt undervolt either but I plan on getting the Abit NF7-S

Doh!! Maybe I should have got that MOBO? Oh well, too late now.

Also, (and I haven't tried this), but does anyone know how good the temps get if you simply lower the FSB but keep the multiplier at 11x (for those of us with locked Bartons?) It could be an effective trick to get to the fanless range - 11X100 = 1.1Ghz, not bad... (or 11X66 = 726MHz, not great, but plenty for internet, office, winamp, etc).

I tried running my 2500+ at 11 x 100FSB fanless with a Zalman 7000A (yes, my chip is locked). It got to 63 degrees after about 13 minutes of Prime95, so I stopped the test. Then again, I recently found out that the store mounted in with only Arctic Silver 3, and like I mentioned, I was not able to undervolt. I do have good case ventilation though (SLK-3700 clone with a 5V 120mm Papst at the back, and just some lame ass ATI Xpert 2000 video card).