[SunRescue] Q: Regarding Sun Educator promo Ultra 5 system

[Cyrus M. Reed]

Even worse, try finding Buffered EDO ECC DRAM DIMMS, that's the *only*
thing my Dual PPro board (Intel PR440FX) will take.  I love the system
(built in 10/100 networking, Adaptec 7880 UW SCSI, I'd call it a
workstation if I didn't know it would be insulting to the real thing), but
RAM is a killer for it. It wasn't so bad a while back when I got the RAM
for it when memory in general was dirt cheap (though this stuff was still
about 50% higher); but now its gone up to about $250/128M when you can
find it at all. I think all the PPro boards required Buffered ECC EDO RAM
if I recall (that is I don't think I've seen any that didn't).

-Cyrus

On Wed, 19 Apr 2000, Gregory Leblanc wrote:

> > -----Original Message-----
> > From: James Lockwood [mailto:james at foonly.com]
> > Sent: Wednesday, April 19, 2000 3:26 PM
> > To: rescue at sunhelp.org
> > Subject: Re: [SunRescue] Q: Regarding Sun Educator promo 
> > Ultra 5 system
> > 
> > 
> > On Wed, 19 Apr 2000 nick at ns.snowman.net wrote:
> > 
> > > The u5 (to the best of my knowledge) uses a thing called 
> > EDO Dimms.  EDO
> > > dimms are evil.  The only reason they were ever created is 
> > sdram failed to
> > > add something on the order of 2 pins so interleaving could 
> > be done.  This
> > > means that while sdram is faster 1 on 1, when you boost it 
> > up to 1 on 5
> > > (interleaved 5 times) or 1 on 10 (interleaved 10 times) 
> > sdram looses.
> > 
> > EDO DRAM predates SDRAM.  EDO was used to cut down on CAS 
> > latch time from
> 
> On a side topic, Intel LX based P-II motherboards often used EDO DRAM DIMMS.
> Real pain in the neck to find, costs much more and is a bunch slower than
> SDRAM.
> 
> > FPM.  SDRAM eliminates that latching interval per address 
> > (just bang on
> > RAS to get more bytes out), making it ideal for cache line refilling. 
> > 
> > You can certainly interleave SDRAM if you like.  Most PC motherboard
> > vendors seem to follow the school of thought of "cut costs no matter
> > what", and are therefore unlikely to handle it correctly.
> 
> So, uhm, why are these machines using EDO ram?  Wouldn't SDRAM be a better,
> faster, cheaper choice?
> 	Greg
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