A64 OC results...

[CrArC]

I'm just curious as to what others have got I was surprised a couple of weeks ago when what I thought was a fairly bad chip suddenly managed to reach 2.5Ghz over the standard stock levels... naturally SuperPI and Sisoft followed...

Well the secret for mine was mostly in the RAM, which doesn't seem to run at it's rated speed of DDR500 without relaxing a few of the default timings (usually the command rate and the most typically changed latency values) so I guess that's up for warranty replacement, right?

Still I was wetting myself when I got to 2.75 with this chip, it's only a 3200. I don't even have a special cooler, just a crappy stock AMD one. *happy noises* I have to say uGuru and the 3rd eye were very important in this also!

I have screenies I could post of sisoft, but only if requested

EDIT: should add SuperPI it managed in 36 seconds, and sisoft indicated it was beating a P4-E 570 3.8Ghz in arithmetic and multimedia... considering that at default clocks it actually falls just behind a 32bit Athlon 3200 I think it's a good improvement!

 

[Dav0s]

have sandra got 64bit benchies yet??

 

[CrArC]

Yeah I use Sandra2005 Pro which supports 64bit benchmarking, it keeps recommending I switch to 64, but I can't since I need a 64bit OS and the only copy of Windows XP 64 that I have is the prerelease beta edition from Microsoft's website and that crashes upon installation with memory errors... guess I'll wait till the full edition since they're doing a swap thing with 32/64 anyway, right?

 

[JN]

if its not too much trouble, i'd love to see any screenies you have

Great OC btw

 

[vice]

I'm just curious as to what others have got I was surprised a couple of weeks ago when what I thought was a fairly bad chip suddenly managed to reach 2.5Ghz over the standard stock levels... naturally SuperPI and Sisoft followed...

Well the secret for mine was mostly in the RAM, which doesn't seem to run at it's rated speed of DDR500 without relaxing a few of the default timings (usually the command rate and the most typically changed latency values) so I guess that's up for warranty replacement, right?

Still I was wetting myself when I got to 2.75 with this chip, it's only a 3200. I don't even have a special cooler, just a crappy stock AMD one. *happy noises* I have to say uGuru and the 3rd eye were very important in this also!

I have screenies I could post of sisoft, but only if requested

EDIT: should add SuperPI it managed in 36 seconds, and sisoft indicated it was beating a P4-E 570 3.8Ghz in arithmetic and multimedia... considering that at default clocks it actually falls just behind a 32bit Athlon 3200 I think it's a good improvement!

The stock fan and hs for that chip should be enough even for high clocks since it runs ice cold. That's a damn good oc, was it stable? What was your clock for 36 seconds in superpi? What ram you using too?

 

[CrArC]

I'll post a few after I get home

Yeah 90nm chips are extremely cold anyway, I think after I first purchased it, with CnQ running and idling with perhaps iTunes in the background it was around 33-35 degrees (room temp 27-29). It was hitting 70 odd with that OC, though... if I get a better cooler perhaps I can go further!

The clock for 36 seconds was 2.70Ghz, and that's what the screenies show too. It wasn't stable enough at 2.75Ghz to get anything done except perhaps music and light web browsing...

Oh, the RAM is Corsair XMS4000 TwinX, 1Gb using two 512MB sticks so that I can take advantage of Dual Channel I have a problem with them though since they can't run at their rated speed of 500Mhz, and even overvolted won't run well past 440Mhz. So I was forced to either run them out of sync for the higher OC's or run them with relaxed timings..

Either way got a bit of Doom3 and HL2 done whilst I was there. Not much since I was worried of a system crash, and both those titles are twitchy (so about 2 minutes of each...) but I found that only direct CPU performance was increased with the OC since the RAM was dragging 3D and other system performance down somewhat. The highest bandwidth I ever got with those sticks was 7.01GB/s, though at default it's about 5.9 and with the OC it ranged from 4.8 to 5.8... sacrifices must be made...

 

[muffin]

Super PI is to 1million digits right? An A64 running properly at 2.7GHz should get faster than that :wiggle:

 

[vice]

Super PI is to 1million digits right? An A64 running properly at 2.7GHz should get faster than that :wiggle:

Yeah at 2.5 ghz I get 34 seconds. His ram had to be loosened though is seems to be dragging him down.

 

[CrArC]

It is a big performance loss on anything that isn't strictly confined to the CPU cache. The bandwidth drops by around 1-2Gb/s which is a big difference, certainly enough to cause issues...

 

[muffin]

Ah yes. Didn't read that much

I know with this sktA setup timings make a lot of difference as well