Summary: I'm sure this is somehow self-evident to the more alpha geeks among you, but I matched the (more complete) specs I had printed on the old stick to the (less-complete) spec listed on Newegg (less) and still no dual-channel. Thanks to Newegg for the incentive to increase my knowledge of RAM memory modules.
Pros: Solid RAM for the type it is, memtest86+ likes it. Crucial modules I've had before seems to be good.
Cons: Not fully compatible with older sticks of the same P/N. I bought this to upgrade an older box that already had a stick of Crucial CT6464Z0B in it, and bought this partly to maintain dual-channel memory mode. This new CT6464Z40B runs fine, but only in single-channel mode; it won't dual-channel with the older CT6464Z40B. Now, some of the other numbers on the old stick are different, but who knows what they mean? Not me. I guess I need to buy another stick of this CT6464...
Summary: My previous 512 ram was dead and i ordered a new one from amazon with a great price and fast shipping but when i received this ram in a sealed box marking 512 ram on the label after i installed the ram i found out there was only 384ram so i missed 128 of ram, i emailed customer service about 6 weeks ago and i never got a reply.
Does not run at rated speed, but does run reliably
28 August 2005
Summary: It simply will not run at 200 Mhz in any of the three boards I have tried it in. I've tried Socket A and two Socket 939 boards, and it always runs at 166 Mhz to be stable. I bought Crucial for the stability and performance reputation, and I am not sure I will buy them again.