Subject: Re: [linux-audio-dev] Performance and Elegance? (Was: High Cost of
From: Joe Pfeiffer (pfeiffer_AT_cs.nmsu.edu)
Date: Thu May 17 2001 - 03:43:28 EEST
I wanted to point out something I discovered on Sun systems pertaining
to memory. At the company I work for we bought 5 new Ultra 80s, which
I thought were pretty good not counting the new blade systems. We
also maxed out the memory. I was looking at the memory and discovered
it was 50ns!! I thought this cannot be! Then I discovered that
instead of using faster RAM, the memory bus is 520 bytes wide ( which
includes some parity ). Now I have done no research on the PC
architecture, anyone have comments on this?
The PC industry is using a misleading spec for memory -- the actual
access time is something on the order of 50ns (I'm sure somebody can
correct me), but there is an on-chip buffer. Memory accesses from the
buffer are at the speeds the manufacturers like to quote.
I'm under the impression that DRAM (including SDROM ) is indeed
inherently slower than CPU speeds, due to the need to charge or
discharge the capacitors used for the actual storage.
-- Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605 Department of Computer Science FAX -- (505) 646-1002 New Mexico State University http://www.cs.nmsu.edu/~pfeiffer SWNMRSEF: http://www.nmsu.edu/~scifair
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