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PC800-40 vs. PC1066 - What the heck???

G

Grid

Junior Member
What is the difference between PC800-40 and the PC1066 RDRAM? I am currently running PC800-40 and my BIOS shows my system bus is running at 533MHz. Is it worth going to PC1066 if I am already running at 533MHz? Whats the deal, I am like totaly confused!! HELP!!!! 😕
 
Your processor is running at 533fsb (133mhz quad pumped)but your memory is running at PC800 speeds (effectively 100mhz). Using PC1066 will mean your memory will also run at 133mhz which is synchronous with the FSB frequency. You will notice the difference😉.
 
The "40" I believe refers to the latency of the memory modules. With RDRAM, the faster the bus, the lower the access latencies (which was one of the big complaints people had about RDRAM when it first came out, compared to SDRAM). PC1066 uses 32ns chips (though there appears to be PC800-45 and PC1066-35, but Intel chipsets don't support those).

As was said, there is a noticeable difference in performance by using faster memory, due both to lower latency and the considerable increase in memory bandwidth. (PC800=3.2GBps, PC1066=4.2GBps).
 
Aaahhhh, makes perfect sense! 😉 Thanks! Without spending an arm and a leg, what type (manufacturor) of PC1066 memory should I buy?
 
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