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memory question
What's the difference between 32meg x 64 and 32meg x 72? Thanks
Sam |
#2
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In article , Sam Owens
wrote: What's the difference between 32meg x 64 and 32meg x 72? Thanks Sam The x64 is non-ECC, while the x72 is ECC. ECC is used on server boards, to catch errors in data read back from the memory. For desktop boards, the error rate is considered low enough that many designs don't support ECC. Check your motherboard manual to see whether ECC is supported or required for proper operation. ECC has the ability to check and correct memory errors. The extra 8 bits available, store a syndrome or signature, and when the 72 bits are read back later, a calculation is done, to see if the syndrome is consistent with the data word. For some small number of errors, the Northbridge can actually figure out which bits are in error, and correct them. If more bits are in error, then the error can be "uncorrectable", and if the processor is about to "eat" that data, generally the processor would be told to crash or error out of the affected application. With the ability to correct errors in memory, it is possible for the hardware to "scrub" the memory. This is a background process, where data unrelated to what the processor is currently doing, is read, corrected if necessary, and written back to the memory. This feature helps a server board that has a lot of memory, from "accumulating" errors in data stored for long periods of time. As long as the number of errors in a data word in memory can be kept small, the "scrubber" can keep removing them. HTH, Paul |
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On Fri, 07 May 2004 19:39:51 -0500, Sam Owens wrote:
What's the difference between 32meg x 64 and 32meg x 72? Thanks 32megx8, of course ;-) The practical difference is the x72 supports ECC or parity, the x64 doesn't support either... /daytripper |
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On Fri, 07 May 2004 19:39:51 -0500, Sam Owens wrote:
What's the difference between 32meg x 64 and 32meg x 72? Thanks Sam Thank You both for your well thought out informative answers Now I know Sam |
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32 x 72 meg RAM sticks are special and are called Registered ECC RAM. Very
few motherboard designs can use them. They're used in servers and high-end workstations. -- DaveW "Sam Owens" wrote in message ... What's the difference between 32meg x 64 and 32meg x 72? Thanks Sam |
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