Today, the vast majority of memory used by desktops, notebooks, and mobile devices is unbuffered non-ECC (Error Checking and Correction) DRAM. In fact, unless one is running an Intel or AMD CPU that can support ECC memory unbuffered ECC DRAM is the only choice for most users. Intel Xeons, for example, support ECC memory, while even the new Core i7’s do not. AMD has much broader ECC support at the CPU level, but many AMD motherboards do not support ECC memory features so it is not universal.
Regular readers of my site know that I am a fan of the Kingston KVR1333D3E9SK2/4G 4GB (2x2GB) ECC Unbuffered DIMM kit. It works in Intel 3400 chipset motherboards that are picky about memory. Two major changes have been happening with regard to this memory.