boris@world.std.com (Boris Levitin) (08/28/90)
cerberus@caen.engin.umich.edu (R Eric Bennett) writes: >Why is the SE/30 clocked 34% slower than the IIci (or why is the IIci 50% >faster than the SE/30)? They both have the same 68030 No, they don't. The SE/30 has a 68030 running at 16MHZ (the same chip that powers the IIcx); the IIci has a faster, 25MHz 68030. >Also, can a Mac Plus be sped up? There is a large number of accelerators available offering 68000, 68020 and 68030 CPUs at a variety of speeds, with or without FPUs. The fastest is a Gemini II 50MHz 68030-based board with a 68882 FPU, available for $2,800, which speeds the Plus up 1,160% (yes, one thousand one hundred sixty percent, or faster than the IIfx). To accelerate a computer, it's not enough to change just the speed of the CPU and FPU; you must also speed up (or replace with faster versions) many the chips with which they interact. That's why you need an accelerator board and not just a faster CPU. >On an aside, why did they put color quickdraw in a computer with a monochrome >monitor attached? To enable people to attach a color video board (such as the RasterOps 264 and 364) to the SE/30's Processor Direct Slot, and power a color monitor. The SE/30 is a relatively fast machine intended for people who may well need/want/ be able to afford color video. Boris Levitin ---------------------------------------------------------------------------- WGBH Public Broadcasting, Boston boris@world.std.com Audience & Marketing Research wgbx!boris_levitin@athena.mit.edu ---------------------------------------------------------------------------- (The opinions expressed herein are my own and do not necessarily coincide with those of my employer or anyone else. The WGBH tag is for ID only.)
ar4@sage.cc.purdue.edu (Piper Keairnes) (08/28/90)
boris@world.std.com (Boris Levitin) writes: >To accelerate a computer, it's not enough to change >just the speed of the CPU and FPU; you must also speed up (or replace with >faster versions) many the chips with which they interact. That's why you >need an accelerator board and not just a faster CPU. Just as well, one should consider the SCSI performace and overall capabilities of the parts involved. To merely plop a 50MHz 68030 in a Plus and then try to compare its performace to a 40MHz IIfx is far-fetched. The IIfx and the IIci are streamlined high performance machines (as far as Macs go). Their entire architecture is such that the maximum performance from the increased clock rate is attained. The Plus architecture cannot fully exploit the power in a 50Mhz accelerator board. The August (I think) issue of MacUser gives you a breakdown of performance of accelerator boards and comparable performance to the Mac line of computers. Pick it up... ----- Piper Keairnes ar4@sage.cc.purdue.edu
boris@world.std.com (Boris Levitin) (08/29/90)
ar4@sage.cc.purdue.edu (Piper Keairnes) writes: >boris@world.std.com (Boris Levitin) writes: >>To accelerate a computer, it's not enough to change >>just the speed of the CPU and FPU; you must also speed up (or replace with >>faster versions) many the chips with which they interact. That's why you >>need an accelerator board and not just a faster CPU. >Just as well, one should consider the SCSI performace and overall >capabilities of the parts involved. To merely plop a 50MHz 68030 in a Plus >and then try to compare its performace to a 40MHz IIfx is far-fetched. The >IIfx and the IIci are streamlined high performance machines (as far as Macs >go). Their entire architecture is such that the maximum performance from the >increased clock rate is attained. >The Plus architecture cannot fully exploit the power in a 50Mhz accelerator >board. The August (I think) issue of MacUser gives you a breakdown of >performance of accelerator boards and comparable performance to the Mac line >of computers. Pick it up... >----- >Piper Keairnes >ar4@sage.cc.purdue.edu Sure, I'm sorry if I indicated otherwise. The only thing an accelerator board (on the Plus or another computer) will change is processing speed. Even with the Gemini II 50MHz 030/882, the Plus will have a slow SCSI bus, no more than 4MB RAM, etc. Boris Levitin ---------------------------------------------------------------------------- WGBH Public Broadcasting, Boston boris@world.std.com Audience & Marketing Research wgbx!boris_levitin@athena.mit.edu ---------------------------------------------------------------------------- (The opinions expressed herein are my own and do not necessarily coincide with those of my employer or anyone else. The WGBH tag is for ID only.)
Adam.Frix@p2.f200.n226.z1.FIDONET.ORG (Adam Frix) (09/01/90)
Boris Levitin writes in a message on 08/29/90 at 04:43:14 ... BL> Sure, I'm sorry if I indicated otherwise. The only thing an BL> accelerator board (on the Plus or another computer) will change BL> is processing speed. Even with the Gemini II 50MHz 030/882, BL> the Plus will have a slow SCSI bus, no more than 4MB RAM, etc.... Total Systems sells a high-speed SCSI port to alleviate that problem. --Adam-- -- Adam Frix via cmhGate - Net 226 fido<=>uucp gateway Col, OH UUCP: ...!osu-cis!n8emr!cmhgate!200.2!Adam.Frix INET: Adam.Frix@p2.f200.n226.z1.FIDONET.ORG