Re: EDO 70ns 16MB and P133/EV Board ?

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Article #2284

#2284

From: Rajesh Varia
Date: Tue, 19 Dec 1995 00:00

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In article <819398125snz@longley.demon.co.uk>
           David@longley.demon.co.uk "David Longley" writes:

> I  guess I can get confirmation that my SIMMs are EDO  by  seeing 
> what  the  EV  setup  detects.  However,  surely  the  60  vs  70 
> nanosecond spreed is not something trivial? Why is it that  INTEL 
> purportedly  say  that  the 133MHz CPU  *must*  have  60ns  SIMMs 
> (quoting  the  above article) but one finds 70ns  SIMMs  in  such 
> systems?
> 
Think about it this way, at 66MHz (external speed of P100 & P133)
clock cycle is 15.15ns.  Thus with 60ns simms you would need 3 
wait states, with 70ns you would need 4.

60 MHz (P90 & P120), cycle is 16.66 ns.  60ns simms = 3 ws, 70ns =
4 ws.

Remember that the marked speed is the slowest guaranted speed, with
most simm actually being quicker than marked.  I have rarely come
across 70ns simms that do not work as 60ns simm when placed in a
simm tester.

> -- 
> David Longley
> 

-- 
Rajesh Varia     raj@c4rv.demon.co.uk

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From: Rajesh Varia <raj@c4rv.demon.co.uk>
Subject: Re: EDO 70ns 16MB and P133/EV Board ?
Date: 1995/12/19
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