Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!sun-barr!rutgers!cbmvax!daveh From: daveh@cbmvax.commodore.com (Dave Haynie) Newsgroups: comp.sys.amiga.hardware Subject: Re: RAMs for the A3000 Keywords: ZIPs or SIPPs Message-ID: <21890@cbmvax.commodore.com> Date: 24 May 91 16:35:26 GMT References: <1991May17.170845.8740@informatik.uni-erlangen.de> <1991May22.211639.8633@menudo.uh.edu> Reply-To: daveh@cbmvax.commodore.com (Dave Haynie) Organization: Commodore, West Chester, PA Lines: 21 In article <1991May22.211639.8633@menudo.uh.edu> jet@casc.math.uh.edu (J Eric Townsend) writes: >In article johns@dworkin.Amber.COM (John Silvia) writes: >>STATIC COLUMN chips offer more storage, and greater speed, and are more >>expensive than PAGE MODE chips. Average Static Column pricing is around >>$35-$42 per chip. >Is it because they happen to be larger chips (1Kx4 instead of 256x4), or is it >for some more nefarious reason? No, static column and page mode DRAMs come in both sizes. The static column memories are faster in the A3000 because the RAMSEY chip can support 68030 cache line burst fetches. It normally takes the RAMSEY chip 20 clock cycles to get 4 longwords. With RAMSEY's burst, it can get four consecutive longwords in 11 clock cycles. This doesn't actually double performance, but it does increase speed noticably in most cases. -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "That's me in the corner, that's me in the spotlight" -R.E.M.