No need to pay the extra getting the PC2-6400 (800mhz), you could of saved some £££ and just brought the 667mhz stuff, they are all the same, they just use different SPD's, which if you have the know how are flashable, however, at the end of the day, you dont even need to flash them, these are major overclockable Micron D9 based moduals, in fact Crucial are Micron, everyone else with Micron Based Moduals have to buy the chips from Crucial/Micron, now known as Lexar Media.
Anyway I have 3gb across 4 sticks on this board of 667mhz stuff, currently running stable at 1081mhz 5-5-5-15 2T @ 2.15v and still yet to tweak my memory on this board.
PC2-5300 667mhz = 3-3-3-12
PC2-6400 800mhz = 4-4-4-12
PC2-8000 1000mhz=5-5-5-15
The Crucial Story taken from here: http://www.crucial.com/uk/company/index.aspx
Crucial, now named Lexar Media, brings you two outstanding brands in memory: Crucial DRAM and Lexar flash products.
Our story starts with Micron Technology, one of the largest dynamic random access memory (DRAM) manufacturers in the world. Headquartered in Boise, Idaho, USA, Micron manufactures DRAM chips and assembles them into high-quality memory modules for sale to original equipment manufacturers (OEM) worldwide.
Having experience success with corporate customers, Micron saw the need to provide OEM-quality memory directly to end users — the home desktop user, the IT network professionals, the student notebook user. So in 1996, Micron responded to a growing demand for high-quality memory upgrades among end users who wanted the best possible performance from their systems. Micron launched Crucial in September of that year, and for the first time, end users had the opportunity to buy directly from the manufacturer the same memory modules bought by the world's leading manufacturers for original installation in their systems.
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