x800gto confusion

[goober]

I flashed my x800gto to the x800xl and i cant get the card to overclock a little over stock. The highest i can over clock it is to i think 420/503 and i start getting artifacts and the screen starts to screw up. I cannot figure out how to get the card to overclock any higher, ive also messed with the memory timings to pretty much the lowest possible clock speeds and the frames per second only hit like 290 max 280avg. and my 3dmark 05 score is at 3277.
I have a intel celeron 2.8 OCed to 3.2, 2.00 gigs of ram.

 

[Lekamies]

so your x800gto has r430(x800xl) core? These dont overclock very well, 420-450Mhz is usual max clock range with stock volts.