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echo: tech
to: Greg Easthom
from: Wayne Chirnside
date: 2003-02-23 13:43:00
subject: Re: RAM sticks.

-=> GREG EASTHOM wrote to WAYNE CHIRNSIDE <=-

 WC>  GE> Intel 4-clock

 WC>  Intel 4 clock? Don't understand that bit.

 GE> http://www.4allmemory.com/index.cfm?fuseaction= faq.details&faq_id=25

 GE> What is the difference between 2-clock and 4-clock memory?

 GE> Two types of SDRAM modules are the 2-clock and the 4-clock module.
 GE> Structurally, they are the same, but they are accessed differently.
 GE> A 2-clock SDRAM module is set up so that each clock cycle accesses two
 GE> chips on the module. A 4-clock SDRAM setup accesses 4 chips per clock
 GE> cycle. To choose what kind to get, you must look into the motherboard's
 GE> documentation. 4-clock modules are the more commonly used.

 GE> The typical indication of the wrong type being used is a system giving
 GE> error beeps and not booting as it cannot use the memory installed. The
 GE> system will not proceed past POST (Power On Self Test). 2-clock was
 GE> only used in 66 MHz systems. All PC 100 and PC 133 memory is 4-clock
 GE> only.

Thanks, that was what was holding me up from committing to purchase
and it seems I was right to do so as this machine's buss runs
at 66 :-(
As to documentation in the manual for an H.P., ha.
Guess I'll snag up some cheap EDO from Ebay for the NEC and see what I
can get going here while waiting for some of this rather unobtainium
SDRAM to make an appearance.
I did download the DIMM SDRAM specification revision 1.0
as a PDF to see what I may be able to squeeze into the H.P.
but the darned timing spec's on the PC100 and PC133 seem to be awfully
picky about whatn they'll accept and still present valid data. 
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