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- From: ejdeal@terri.austin.ibm.com
- Newsgroups: comp.sys.ibm.pc.misc
- Subject: Re: 384-40 vs 486sx25
- Message-ID: <1992Aug19.200047.20045@awdprime.austin.ibm.com>
- Date: 19 Aug 92 20:00:47 GMT
- References: <1992Aug18.210209.6191@sarah.albany.edu>
- Sender: news@awdprime.austin.ibm.com (USENET News)
- Reply-To: ...@cs.utexas.edu:ibmchs!auschs!terri.austin.ibm.com!ejdeal
- Organization: IBM Advanced Workstation Division
- Lines: 61
-
- In article <1992Aug18.210209.6191@sarah.albany.edu>,
- pv9955@albnyvms.bitnet writes:
- >
- > I know that a form of this question has apreared all over the net. But this
- > one is slightly different...
- > I think that we will all agree that a 486dx2-50 is faster than a 486dx33,
- > with internal processing. But it still operates at 25mHz for addressing the
- > bus, and hard drive, whereas the 486dx33 operates at the faster 33mHz.
- > So under the assumption that a 386-40 and a 486sx25 can process information
- > at about the same speed (the 386 is faster, the 486 is more efficient),
- > is is safe to assume that the 386-40 will access the bus (including hard
- > drive) faster than a 486 running at 25mHz ?
- > For those people using Windows or OS2, which use a lot of virtual memory, and
- > disk swapping, this question should be more important than internal
- > processing. I am about the buy a computer for OS2, and I would like to know
- > which motherboard will handle the disk swapping better.
- >
- > Thanks,
- > Peter V.
-
- Unfortunately, the question isn't as simple as the raw processor speed.
- The motherboard choice and peripherals would likely be the
- differentiating factor.
-
- Since ISA motherboards all run between 6 and 12 MHz (depending on your
- BIOS settings and how far you want to push the bus speed), both
- processors should have equal data transfer capabilities over the bus.
- Now, you can improve the performance by selecting an EISA, MCA, or
- local bus motherboard, all of which should outperform ISA.
-
- I use OS/2 and just upgraded my system (motherboard change):
-
- was: is now:
- 386-25 MHz 486-33 MHz
- 0K cache 256K cache
- 8 MB RAM (80ns) 8 MB RAM (70ns)
-
- Both used the same 85 MB SCSI drive using INT 13 access under OS/2.
- (Still waiting for the drivers :-( ).
-
- When running with my new motherboard, the main difference I see is
- with screen update speeds and application performance. Windows open
- faster and everything is more fluid. Unfortunately, the overall speed isn't
- great because disk transfers are holding everything up!
- In comparison, I've seen OS/2 run on a 486-33 with 64K cache,
- 4 MB RAM, and 85 Meg IDE. Since IDE doesn't need the additional
- drivers this system ran as fast as mine simply because the disk
- transfer rates are higher. EVEN WITH 4 MEG! (NOTE: I wasn't
- running a bunch of programs at once).
-
- Please do not take my comments about SCSI and IDE to mean that
- SCSI is inferior to IDE. When the drivers become available,
- my drive should be at least equivalent to a similar IDE.
-
- I guess the moral of the story is you either get a fast disk or
- more RAM (ie refill RAM faster or don't go to disk often) for best
- performance. Processor speed/performance relates primarily to
- application performance.
-
-
- Eric Deal
-