luismxc

Greetings

I have an sapphire x1800gto and i've discovered that when i overclock the gpu i can go to 612 mhz stable at 1.2 v (74º C on the gpu, 4 hours of atitool with no artifacts). When i overclock the memory i can go to almost 700 mhz @ 2.1 v (495 mhz stock) (i didn't try further). If i put the two of them together (gpu + mem), both atitool and ati tray tools go crazy finding artifacts after a few seconds. It seems my PSU can't handle much... Right now i've to work at 560/612 core/mem @ stock voltages and it seems to be stable (2 hours of atitool scan) .. However ATT still artifacts after 1000 - 1100 seconds.

Could it really be the PSU? I find it strange...550 w and 34 amp in the +12 rail (+12v1=16 amp ; +12v2=18 amp), should do more than enough... The gpu is cooled by an zalman vf700 cu.. so taking the temperature away it only leaves the PSU..right?

Anyway acording to my mobo monitor the +12v rail stays between 11.980 (idle) and 11.750 (running a 3d program)...

What do you think? Thanks!

cokker

Well it could be your PSU, it does seem pretty cheap

But if your a bit short on money to upgrade right now heres what i would do with the card, have you tried "Find max core/memory" in ATI tool?

Also try finding the max on the core and then overclocking the memory to suit, or try the other way round.

Try upping the core and memory together 3% at a time eg:
400/500 + 3% = 412/515
412/515 + 3% = 424/530 etc etc

Or try 5% at a time if your feeling impaitient lol.