in need of new PSU, maybe Chieftec 420W

[F_A_L_C_O_N]

Not completely, but your other suggestion worked thanks

With new PSU I couldnt recreate event when artifacting started with Prime95 and 3dmark2003 running simultaneously

but UT2004 onslaught still produced them after some 45min-1hour playing

so first I lowered default speed from 400/350 to what is default on Sapphire Atlantis: 380/340 no problems after good hour of playing onslaught

then I flashed the ATI BIOS you recommended, upped the core/mem to GeCube overclocked default 400/350 and set botmach onslaught to run for 9000+ seconds

checked after hour and a half, no artifacts

I forgot to set virtual memory to higher value, so I ran out of memory, however, wil do that when I go out tommorow, set botmach to 8 hours and hopefully everything will be OK
I am quite sure this time it will be

As you allready discovered, something is very much wrong with GeCube BIOS and I have seen more of the similar reports around the net

BTW later I will try some overclocking
I guess with 350(700) ram is more or less at its ceiling, but I would like to check if core can go higher
it easily goes to 450,however I havent checked for artifacts with something like UT or rthdribl tool yet