Here are the final overclocks with stock cooler. Core needed 1.225v to reach 628. 1.2v would give lockups. 648 @ 1.25 would throttle down to 500 core. The reason I know this is because @ 628 core fill rate in 3dmark 01 was 9800 MP/sec, as expected. But, at 648 core, fill rate in 01 was just 7700 MP/sec, something a 500 core XL would likely do. VPU recover WAS disabled.
700 core gave immediate lock/black screen at voltage up to 1.3v, just too much heat for the little stock cooler.
Memory voltage is at stock (1.9), pretty amazing i say. I tried going to 800mhz, but no matter what volage, 1.9, 1.95, 2.0 or 2.05 I got artifacts. Again, just too much heat.
Still amazing how the XL needs LESS voltage to reach XT levels.
So, unless I get better cooling 1550 is max mem will do. On the core however, I could prolly get higher, but it already reaches 72'C at load and there is bug at 648 so Im gonna wait till official drivers and compatible ATI tool are released.
Also, for those getting X1800 XL, if you want CCC to display correct temps, you cant have the overclocking tool from driverhaven open at the same time.
Im sure score would be higher if I had one of those overclocked FX-57 everyone here seems to have.
*edit: idle temp has settled @ 55'C, at 100% fan of course.
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