Trying for 850 MHz on 4870 X2...

[AgentGOD]

Ok so, I have Catalyst 9.5 installed (with CCC, display drivers, etc) on Vista Ultimate x64 SP2.

My goal is to get 850 MHz Core on both GPU cores totally stable (at least in 3DMark and games). So, I used RivaTuner to crank up the voltage to 1.3125V for both GPUs, using:

rivatuner.exe /sd0 /wi1,70,18,45 /sd2 /wi1,70,18,45


Which worked, verified with GPU-Z on both GPUs. I then set the core clock to 850 MHz in RivaTuner (I have ClockCloning enabled under Power User so it applies to both GPU cores). I also cranked up the fan speed to 65%.

I played a little Call of Duty 4 to test, did not artifact at all. But then, after about 2 or so minutes of game-play, the system completely locked. No BSOD or anything, just locked. After rebooting, I tried bumping up the voltage to 1.3625v and decided to run 3DMark06... but again locked right at the end of GT1. This time though, I had two instances of GPU-Z running in the background, constantly monitoring temps/volts/amps of both GPUs.

I looked at the logs after rebooting, and I did not see overly high temps...

Take a look at the logs please:
http://www.ultimate-filez.com/files/GPU0_Log.txt
http://www.ultimate-filez.com/files/GPU1_Log.txt

Anyone know what's causing the lock, and a solution?

I'm stumped :(

[chew*]

Whats most likely happening is the ram is locking up due to the increased heat from the GPU's higher clocks and voltage if this is on air.

[Razrback16]

I saw a guide a while back on this forum, likely in the video card or cooling sections for the 4870X2 where they kept the stock air cooler but modded it by enlarging the opening of the fan section so it could pull more air in -- they also cut out the fins at the back of the cooler on the bracket so it wouldn't create as much airflow resistance. I seem to remember it potentially decreasing temps by 10+ degrees celsius. Might be worth looking at for you if you're still running the stock cooler.

Edit: Found it -- http://www.octeamdenmark.com/forums/showthread.php?p=28080#post28080

[AgentGOD]

Whats most likely happening is the ram is locking up due to the increased heat from the GPU's higher clocks and voltage if this is on air.
Anything I can do? Downclock the memory speed? :P

[Lastviking]

Hmm is Sd2 right sould it not be Sd1?

[AgentGOD]

/sd1 is for the 9800 GX2 only.

[JamesBong420]

yea on air i have to put my memory to 955mhz to get my cores to hit 850mhz+.. :cool:

[AgentGOD]

yea on air i have to put my memory to 955mhz to get my cores to hit 850mhz+.. :cool:
So you had to OVERCLOCK the memory to get your core higher? o.0

[dpokrajac0]

Did u try to run some benchies?

[TheKarmakazi]

So you had to OVERCLOCK the memory to get your core higher? o.0

He prolly using the asus top bios which has 1000mhz ram clocks