Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!van-bc!outbound!patrick_meloy From: patrick_meloy@outbound.wimsey.bc.ca (Patrick Meloy) Newsgroups: comp.sys.amiga.misc Subject: Re: Amiga 3000's that run at 16mhz and the 68040. Message-ID: Date: 6 Mar 91 07:47:33 GMT Organization: Outbound Communications Lines: 30 I'm not exactly a hardware guru (understatement :) but there are a couple of things I have picked up about the 3000. >Hey does anybody know if the 68040 speed-up boards for the amiga >3000 ,16mhz version, work at top speed or at the speed of the system. >What determines the speed of the bus???? How fast is the 68040 >compared to the 3000. How much do the speed-up cards cost with The 3000 bus goes as fast as the original CPU. The 16Mhz version's bus runs at 16mhz, the 25Mhz at 25Mhz. This is one of the 'unsung' nifties of the 3000 over most other 'speedyboxes' on the market. The Macs run on NuBus which is (as I am told) 10Mhz only. No matter how fast the CPU is. I don't know whether the 16mhz boxes are capable of 25Mhz on the bus or if they are restricted to 16Mhz only. Either way your bus is going faster (and in 32bits) which is far far better than the 8/16 bit 8-10Mhz buses of the competition. The 68030 25Mhz has a mip rating in around 7.5 (we all know how bogus MIPS rating are, but its all we have for comparison). The 68040 of the same speed is presently up around 20-27 MIPS (a 486 is typically 15-18 MIPS) and should be able to hit 40 MIPS in the final production (All chips out to date are really more of less BETA versions). Again, I'm not a hardware GURU and am only repeating what I have picked up from other people. If someone who REALLY knows would care to comment we'd all be better off :) --------------------------------------- | patrick_meloy@outbound.wimsey.bc.ca | | 'The Outbound' BBS Vancouver BC | ---------------------------------------