I bought an XFX 7900GT (520/1500) and I'm really happy with it. Performance is SUPERB! Really great value for the price I paid for it. This card comes with the Samsung k4j55323qg-bc14 GDDR3 chip (1.4ns) that is supposed to run at 700MHz/1400MHz effective. http://www.samsung.com/Products/Sem.../GDDR3SDRAM/256Mbit/K4J55323QG/K4J55323QG.htm However, XFX has them running at 750MHz/1500MHz effective. Anyways, I started overclocking it and when I started raising the ram, it seemed like it just wouldn't stop going... At first I thought coolbits wasn't working or something but SysTool showed that the clocks were real. Well just look at what I've got. Now do keep in mind that there is nothing on the ram chips at all. It's on stock cooling and unmodded in any way shape or form. I will probably be able to push it higher with better cooling. The OC at the end of the day was 590MHz core 870/1740MHz ram. This is a stable OC (no artifacts or anything - tested by looping a variety of games.) I could go higher but I would get heat artifacts on the core and slight artifacts and mis rendering on the ram.) Note: 3dmark06 wouldn't run at any setting. Crashes on the HDR tests. Must be driver problems or something.