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- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!gatech!destroyer!cs.ubc.ca!uw-beaver!newsfeed.rice.edu!rice!stiv
- From: stiv@stat.rice.edu (david n stivers)
- Subject: Brainstorm & MicroMac SE accelerators
- Message-ID: <C0Lx69.JKD@rice.edu>
- Sender: news@rice.edu (News)
- Organization: Dept. of Statistics, Rice University
- Date: Sat, 9 Jan 1993 22:01:21 GMT
- Lines: 44
-
- The Brainstorm accelerator is remarkably simple and elegant; it
- consists of a new bus chip (twice as fast @16MHz and tweaked) and a new
- CPU (also 2x as fast, a 16MHz 68000), both of which just plug in (the
- CPU is by itself on a very small daughter board that plugs into the
- expansion slot). I assume that there is some software as well. This
- package increases speed by almost exactly 2X (see MacWeek May 4), but
- it's still significantly slower than the Classic II. List is $289 for SE.
- Could Brainstorm have used a 16MHz 020 or 030 instead?
-
- For $299, there is a 25MHz 68030 accelerator from MicroMac. This is
- designed around 60ns SIMMs. How much of a performance hit do you take
- if you use 70 or 80 ns SIMMs instead? (They sell 60ns 1M SIMMs for $37
- apiece). This is a more traditional daughter board that plugs into the
- expansion slot, and includes an FPU slot and a PMMU.
-
- These two are the cheapest accelerators for the SE that I've been able
- to find. I really like the elegance of the Brainstorm, but it seems a
- little overpriced if you can get a 25 MHz 030 w/FPU slot and PMMU for
- only a little more. I guess that the disadvantages of the MicroMac
- would be slower disk throughput and poorer compatability. The tradeoff
- would be _much_ greater CPU speed (esp w/FPU) and greater memory
- capabilities (16M w/Virtual 3.0).
-
- I guess I'm really wondering why Brainstorm didn't use a more powerful
- CPU. I could live w/o the FPU and extra memory, but I'd really like the
- greater speed, and I like the trick that they used to speed up the
- bus. Why couldn't they use a 16MHz 020 or 030 (assuming that the bus
- speed is tied in to the CPU speed)?
-
- Reviewing the Speedometer results posted (are all those copies
- registered? :-| ), it seems that using the 030 boosts speed by 2x, so
- that a 16MHz 030 is about 4x faster than an 8MHz SE/Classic.
-
- Brainstorm 415-964-2131
- (Reportedly, WE FIX MACS 800-933-4962 carries these at a pretty good
- discount.)
-
- MicroMac 714-362-1000
-
- Comments?
-
- David
- --
- david n stivers stiv@rice.edu
-