Official chipset manufacturer memory compatibility overview

Intel

DDR: http://developer.intel.com/technology/memory/ddr/valid/dram_results.htm
DDR II: http://developer.intel.com/technology/memory/ddr/valid/dram_results.htm

NVIDIA

nForce, nForce2: http://www.nvidia.com/content/nForceMemoryCompatability/lstnForceMemoryCompatibility.asp

ATI

Radeon 9100 IGP: http://mirror.ati.com/products/radeon9100igp/memvendor.html