And I sure don't know... I'm trying to find out if this is the memory that I bought installed in my computer......What I bought was......Memory: 4GB DDR2 Corsair at 1066MHz Dominator (Dual Channel) (Extreme-Performance)What sandra says I have is......Memory Module 4Manufacturer : CorsairModel : CM2X1024-8500C5DExtended Information : mVNType : 1GB DIMM DDR2Technology : 16x(64Mx8)Speed : PC2-6400U DDR2-400Standard Timings : 5.0-5-5-18 3-22-6-3Version : 1.2Date of Manufacture : Saturday, December 25, 1999Memory DC Line : 1.80VSet Timing @ 400MHz : 5.0-5-5-18 3-22-6-3Set Timing @ 270MHz : 4.0-3-3-12 2-15-4-2Enhanced Performance Profiles : YesProfile @ 533MHz: Optimal : 5-5-5-15 X-22-32-X 2T 2.2VAre they the same???? Thanks...Mason

Hi Mason,Yes, they are the same. I had a similar concern most recently. If you bought your memory in matched sets, as I assume you have, the model numbers are different than if you had bought individual sticks. Sandra is giving you the "individual sticks" model number. As for the speed, all 1066 memory is really just OC'd 800. So the indication of PC2-6400U DDR2-400 is correct.Regards,Jeff

Ahhh..You're a good man..Thanks much for the info...And yes I bought them in pairs........