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OC'ing 3400+ Clawhammer

A

ATW

Limp Gawd
Joined
Jan 27, 2003
Messages
476
3400+ Clawhammer "CG" - default 1.5V
Cooled with Zalman 7000A-cu + AS5 30-32C in bios, 25-27C in MBM5
Mushkin BH-6 (voltage currently on auto, unsure what that value is)
400w Antec PSU

My first go at it, I simply locked the agp/pci on the K8N Neo, set fsb to 205 and it ran flawlessly. Bumped it to 210, my storage hard drive went undetected at startup and Windows wouldn't boot. Reset bios to try it again.

Second attempt I did some research and came to the understanding that SATA 1/2 are not locked on the Neo, so I unplugged my storage drive and disabled 1/2, repeated steps from first attempt, going directly to 210. It booted fine, then Windows went south upon loading the desktop, so I reset the bios again.

I then upped vcore to 1.55V, dropped memory timings to 2.5-3-3-8, went directly to 210 again, and upon saving and exiting the bios, a few long, loud beeping sounds came from the motherboard, and it shut itself off. I knew something was awry when I could turn the thing on/off using the power supply switch rather than the case's power switch. I cleared the cmos, accidentally powering on while doing so (rookie-cmos-clearing mistake), but luckily no damage was done to the board.

It's been suggested that either the memory voltage or the power supply are limiting me. I had really intended to try and get 215-220 without setting voltages anywhere near the breaking point, because to be frank, I'm a tightwad and don't want to risk damage to anything. Any suggestions?
 
On the Neo2 Plat the AGP Freq must be set to 67 to actually lock it, not 66. Use SATA 3/4 instead of 1/2, these were the first problems I had personally.

Update your BIOS. If you're on the Neo2 Plat, 1.3b6 seems to give the best overall results.
 
joecuddles said:
On the Neo2 Plat the AGP Freq must be set to 67 to actually lock it, not 66. Use SATA 3/4 instead of 1/2, these were the first problems I had personally.

Update your BIOS. If you're on the Neo2 Plat, 1.3b6 seems to give the best overall results.
Click to expand...

It's S754 Neo Platinum, AGP is at 67, and SATA 1/2 are disabled.
 
You might just need more voltage. If you have the CPU VID option on your BIOS try 1.55v + 5% and see how that fares.

To eliminated your memory as a problem, run at retarded timings like 3-4-4-8 to make sure that isn't the issue.
 
That's not going to work, because it was the voltage bump that made it shut itself off. Something is not allowing me to increase voltages at all.
 
Set your ram to 2.85v, it won't harm it at all (as most ram is rated for 2.8v) and you can run it totally safely. This may be the boost you need. As I said, to make sure it's not your ram, run at 3-4-4-8 or something and see if it boots at 210 FSB, if it does, start tightening the ram and see how low you can take it before it stops booting. Then memtest it.
 
Well, the vdimm did it. I'ts running at 2.4ghz (218fsb) which is all I intended to reach. I've got it at 2.7vdimm, but I notice some slight Windows stability problems (cursor and window closing lag) after I tried pulling memory timings back down (2-3-3-6). I'd like to get it back to 2-2-2-6 where it really shines, without taking the voltage through the roof. Some have told me 2.8-2.85v is high, while others say that's nothing. Is taking it that high going to risk any damage to the memory or board, or reduce it's lifespan? I know the BH-6 likes voltage, but my searches on finding the breaking point haven't turned up much.
 
2.85v is fine. People have been running BH5 and other types of ram at 3.4v for extremely long periods of time (years) with no issues. While you would need a fan running at 3.4v, 2.85v is perfectly safe without extra cooling. No worries on burning anything out or reducing lifespan.

Always use memtest to check your ram after changing timings and such if you're having problems. Once you narrow down that it isn't the ram, you know it's the CPU. 2.4Ghz might just bee too high and that's why you're getting stability issues.
 
I gave it a shot at 2.8v @ 2-2-2-6 and got no boot.
 
2-2-2-5 doesn't usually go far unless you're on VX, BH5 or other really high end ram. 218 sounds about right. Just go 2.5-2-2-5. I bet it will boot fine :) Go back to 2.75v or 2.7v on the ram as well if it's working so far for you. If not, try 2.8v or 2.85v. If that still doesn't work at 2.5-2-2-5, try 2.5-3-2-5. I don't get past 2-2-2-5 at even 210 on my ram personally, it's to be expected. 2.5 will take you much farther.

Just to ease your mind about the whole 2.8v+ thing, my ram (and a lot of other ram) is actually rated at 2.8v by default. Pushing 2.85v through ram that's stock 2.6v won't cause any issues with overheating or anything, it's perfectly safe.
 
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