i got the sapphire version of the x1650pro AGP, this version starts off at 546Mhz, and yea the max core is 675Mhz, the memory is locked on mine, i can't change it either way without it crashing. I use ATI tool, have for years, its never let me down. I don't really wanna change the memory anyway, its at 1594Mhz, there is an option to disable the crashing(RAMDAC) when the memory is adjusted with RivaTuner, but i cannot figure out how to get it working, its a setting exclusively for the ATI x1000 series. I butchered up a few CPU heatsinks and thermal pasted em on the ram chips, and attempted to adjust the memory again with no success over\\underclocking, also, heatsinking the co-processor on the opposite side of the board from the main gpu should be mandatory (has white tape with a square cut in it, makes the surface flat which is perfect for placing a heatsink on), whilst running doom 3 OC'ed, i put god mode on and let a bunch of creatures attack me and i stood there. I felt around the card for hotspots, that co-processor was unnervingly hot, also the 4 power fets(2 on each side of the board, they are heatsinked to the card itself(stock)) were very hot. So now my card has 13 heatsinks and 2 fans. the 2nd fan is a chassis fan that cools the gpu co-processor sink and the mobo's northbridge sink, seeing as they are right next to eachother. Since I have performed these modifications, I have gained as much performance with cooling as i have overclocking. Now i can play unreal tournament 3 on max and the gameplay is smooth as Jessica Alba's nice round buttocks. paid 100bux even for this card, and it was worth it, oh and BTW THIS CARD RUNS FINE ON MAX250 WATT PSU'S cuz im still using my stock 218 watt rms 14A PSU and the specs call for 350watt 18A min, and with an insanely beefed up memory clock. this card is worth every penny.
X1650PRO AGP 675Mhz\\1.6Ghz 512mb on 218watt psu