What program to check overclock?

[Dutch Guy]

What program is best to check the max. overclock on a 7800GT card?

Nvidia auto detect suggests 490/1120 but that gives me graphic corruption in NFS:Carbon and F.E.A.R.

Last night I let ATI Tool run to find the max memoryclock, but at 1200Mhz the screen corrupted instead of ATI Tool saying there were errors forcing me to reboot

So what program is best?

 

[Dutch Guy]

ATi Tool works well, but you can't leave it alone! I'd run ATi Tool but manually watch for distortions. When you see the first one, stop the test and back off a few % on the overclock.

That is what puzzles me, I watched ATI Tool the whole time and there were no artifacts at 1200Mhz but at ~1240Mhz the whole screen got corrupted

 

[Dutch Guy]

How odd! Did you clock your GPU core first?

Rivatuner is also quit good. Try using that to clock and then sit through 3d mark 06 to test.

Core clock was at default.

I did do some overclocking in the past but got mixed results, maybe it was also driver related.

Say 490Mhz core works fine on 3DMark2001/'03/'05 and '06 but gives graphic corruption in F.E.A.R. and gives black screens in Oblivion.

So as a result of that I just left it at a small overclock.

 

[Dutch Guy]

Started at the beginning again, set the card to default and let the Nvidia control panel find the max clocks, which said they were 490/1120, after setting those clocks and starting F.E.A.R. I was greeted by flashing polygons which were also present in NFS:Carbon

So yet again I am stumped, surely it can't be that the max overclock is lower than what the control panel thinks?

 

[Dutch Guy]

ati tool is best used to check gpu core overclocks. NOT the memory, the ram used by the spinning cube in ati tool is probably under 10mb, so if you have loads more ram than that then you can;t test it in ati tool.

best to use rthdribl with high amounts of AA and make the screen size large. can take over 100mb of ram with those settings which is a far better test.

I see, no use in using it to test if it only uses 10mb out of 256mb.

I will try it with rthdribl

 

[Dutch Guy]

1200Mhz failed the test in Rivatuner, 1180Mhz passed the test and in RTHDRIL (who came up with that name ) it worked fine at 1180Mhz with the core at stock speed, also 3DMark'03 and F.E.A.R. worked fine at that memoryspeed.

So it looks like the core can only clock to ~465Mhz which is kinda disappointing as the stock speed on my XFX card is 450Mhz but I guess there is nothing I can do about that other than sell my kid to get a 8800GTS/GTX