Run it at the lowest speed then change your memory timings. 5-2-2-2 instead of running at 400mhz with 7-2-2-2.5
You won\'t be able to overclock a 2.1gb (266) chip to a 3.2gb (400) chip.
Even better, just get another chip. Try to match it to the chip you already have. Different manufatures use different SPDs. So if you want to change your memory timings, you\'ll most likely get trouble with mixed memory.