home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!cs.utexas.edu!swrinde!mips!cs.uoregon.edu!nntp.uoregon.edu!news.u.washington.edu!milton.u.washington.edu!macuser
- From: macuser@milton.u.washington.edu (Hung Le)
- Newsgroups: comp.sys.mac.misc
- Subject: Re: Information on: The IIvi, IIvx, and Performa 600
- Message-ID: <1992Aug16.234034.10895@u.washington.edu>
- Date: 16 Aug 92 23:40:34 GMT
- References: <1992Aug16.210017.1816@risky.ecs.umass.edu>
- Sender: news@u.washington.edu (USENET News System)
- Organization: University of Washington, Seattle
- Lines: 65
-
- In article <1992Aug16.210017.1816@risky.ecs.umass.edu> breck@ganzer.ecs.umass.edu () writes:
- >Someone emailed to me (Liam Breck):
- >> in comp.sys.mac.misc you write:
- >> > The IIsi's only advantages are slightly better CPU speed (not a big
- >> > enough difference to notice in real time use, but you will notice the
- >> > disappointing screen redraw speed) and the ability to plug in Nubus
- >> > cards, again, not an issue because the LCII is a very popular machine,
- >> > so there are a lot of cards for its PDS (processor direct slot).
- >>
- >> You want to justify this? The si uses a 32 bit bus, not a 16 bit bus, so is
- >> about twice as fast. Same reason an SE/30 is twice as fast as an LCII. Also
- >> an LCII has max memory of 10MB. That doesn't leave much room for expansion.
- >> I have 8MB on my SE/30 right now and plan to go to 20MB in a month or so.
- >> I'd be pissed off if my machine maxed out at 10MB.
- >
- >This is a common misconception. Actually, the IIsi is about 28%
- >faster, which is not enough to notice in most real-time applications.
- >When doing something very CPU-bound, you might notice. That is to
- >say, if you usually complete a coffee break while compressing a large
- >archive with an LCII, you will have a bite of doughnut and sip of
- >coffee to go when the same task finishes on a IIsi. :-) This 28%
- >difference in speed is mostly accounted for by the difference in
- >processor speed beetween the two machines -- 16MHz vs. 25MHz. The
- >*IIci* is something like twice as fast as the LCII since it's clock
- >speed is 33MHz. The bandwidth of the memory bus is really not
- >critical in personal computers, 'cause other bottlenecks hold things
- >up before the bus width does. For instance, the 80386 is only 4%
- >faster than the 80386sx, which has a 16-bit external memory path.
- >It's the same in the case of the Macs; you'll find that the original
- >Mac II is only 4% faster than the original LC (both 020s at 16MHz).
- >
- >A really critical issue, though, is screen redraw time, since most
- >real-time apps (word processors, drawing apps, the finder, etc.)
- >redraw the screen a lot. The LCII uses the latest Apple on-board
- >video standard, which includes dedicated, dual-ported VRAM. The same
- >stuff that the Quadras use, only pared down for the LCII. It's very
- >fast compared to using the main memory for video (the IIsi and IIci do
- >this). You can speed up video on the latter machines by making your
- >RAM cache huge, but that's another subject, see one of the columns in
- >the current MacWorld (sorry, forget which one) for more info.
- >
- >Another point about video... Since the LCII can use a low cost VGA
- >monitor (I got a Trinitron screen for $350) it really lets you save on
- >the monitor. To get the same quality on a IIsi, expect to shell out
- >the bucks!
- >
- >The 10MB limit on the LCII's memory expansion is unfortunate, but not
- >unacceptable. I have 8MB in mine, and run a whole heap of concurrent
- >applications and I haven't run out of memory yet! If I was going to
- >use Quark and Photoshop at the same time to work on some layout, I
- >would buy a IIci (or one of the future Macs) and a lot of memory, not
- >a IIsi and same.
- >
- >So, when the whole story's told, the LCII is a better machine
- >price/performance wise than the IIsi. The only reason I can think of
- >to buy a IIsi is if you absolutely have to use a Nubus card. But
- >since the LC(II) is the best selling Mac ever made, I don't expect
- >you'll find a lack of cards for it...
- >--
- >Liam Breck breck@zonker.ecs.umass.edu
- >
-
-
-
- excuse, but the IIci is only 25Mhz, not 33Mhz!
-