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

[nick at ns.snowman.net]

That's exactly the thing Sun's use.  As I said, they are evil.
	Nick

On Wed, 19 Apr 2000, Cyrus M. Reed wrote:

> 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
> > _______________________________________________
> > Rescue maillist  -  Rescue at sunhelp.org
> > http://www.sunhelp.org/mailman/listinfo/rescue
> > 
> 
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