[SunRescue] Q: Regarding Sun Educator promo Ultra 5 system
GLeblanc at cu-portland.edu
Wed Apr 19 17:56:41 CDT 2000
> -----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
> 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?
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