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- Path: sparky!uunet!think.com!ames!data.nas.nasa.gov!mustang.mst6.lanl.gov!nntp-server.caltech.edu!news
- From: steele@vlsi.caltech.edu (Craig Steele)
- Newsgroups: comp.sys.mac.hardware
- Subject: Re: 68040 speedup? 25MHz -> 33MHz
- Date: 20 Nov 1992 11:06:44 GMT
- Organization: California Institute of Technology
- Lines: 17
- Distribution: world
- Message-ID: <1eigs4INNgvv@gap.caltech.edu>
- References: <1992Nov17.011908.8812@reed.edu>
- Reply-To: steele@vlsi.caltech.edu (Craig Steele)
- NNTP-Posting-Host: kiwi.cs.caltech.edu
- Keywords: quadra, cache, speedup
-
- In article <7038@news.duke.edu> cchung@sneezy.phy.duke.edu
- (Charles Chung)
- writes:
- > One more thing, I think Daystar puts out a 128K cache out for the
- > quadras. However, I understand that Motorola estimates 93% hit rate
- > for the 2 4K caches on the 040. Has anyone used this product? Does
- > it speed up anything at all? How accurate are Motorola's estimates?
-
- The FastCache Quadra is reviewed in the MacWeek 11/9 issue,
- Their numbers showed speedups between ~2 and 35% on a Q700.
- On my applications I see 10 to 20% on large CPU-bound applications,
- no improvement on either small (e.g., benchmark programs), which
- fit well in the primary cache, or disk-bound applications.
- At $250, it's marginally cost-effective, but won't revolutionize
- your life.
-
- Craig Steele, steele@vlsi.caltech.edu
-