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- Path: sparky!uunet!olivea!spool.mu.edu!uwm.edu!rpi!utcsri!geac!itcyyz!lsican!torsys04_7!michael
- From: michael@Canada.lsil.com (Michael Smith)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: chipset:UMC,OPTi,C&T what are they?
- Message-ID: <1992Dec18.201218.9405@lsican.uucp>
- Date: 18 Dec 92 20:12:18 GMT
- References: <1992Dec16.095448.90827@vaxc.cc.monash.edu.au>
- Sender: usenet@lsican.uucp
- Reply-To: michael@Canada.lsil.com
- Organization: LSI Logic Corporation of Canada, Inc.
- Lines: 63
-
- In article 90827@vaxc.cc.monash.edu.au, ecn644e@vaxc.cc.monash.edu.au () writes:
- >Dear Netters,
- >
- >What are the differeces between motherboards built according to different kinds
- >of "chipsets". I heard about names like UMC, OPTi, C&T and of course Intel.
- >Also people comment about have a 1 or 3 chips configuration.
- >
- >Is is one kind of chipset better than the other for some reasons? Sorry if this
- >is a FAQ. Please enlighten me in this matter.
- >
- >Thanks in advance.
- >
- >Simpson.
-
-
- A "chipset" is a group of support chips that allow one to easily have things such
- as DMA, Interrupt controllers, DRAM, timers, ISA/EISA/MCA/PCI bus control, and
- other things in just a few chips instead of the zillions of discrete chips (and
- PALs and stuff) that were on the original IBM-PC machine.
-
- The Headland (i.e. LSI-Logic) "Shasta" 486 chip-set has three components:
-
- - A Local to ISA bus controller
- - A MCU (Memory Control Unit)
- - A cache controller
-
- Included in these things are refresh controller, write-buffers, write-gatherers,
- DRAM control algorithms, EMS re-mapping hardware, DOS compatability hole
- support, and piles of other details.
-
- The Headland Shasta chipset without cache is essentially as good as all of the
- other chipsets *WITH* cache. The secret of success here is with our write-buffers
- and write-gatherers; other chipsets suck-rocks on writes. Throw in a level-two
- cache and things continue to get faster.
-
- Most chip-sets are all the same; i.e. benchmarks will run the same on all of them.
- Some companies (e.g. Headland) do some real engineering with these things and
- put together a chipset that will actually show speed increases in real applications.
- This is especially true if you're running a 486DX2 with a Unix environment; the
- Shasta chip-set is significantly faster in this environment than OPTI, VTI, or
- other chipsets.
-
- The number of chips in the set is basically related to cost, and not really
- performance. Obviously, as more pins are available (as there will be on 3 chips
- rather than two or one), there are more possible things that can be done in
- the chipset. So, the number of chips is loosely related to features and
- performance, but only in an indirect way.
-
-
- Michael Smith - Chipset Design Engineer
-
- Phone: (416) 620-7400 michael@canada.lsil.com
- Fax: (416) 694-5005
-
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- _/ LSI Logic Corp. of Canada, Inc.
- _/_/_/ Suite 1110, 401 The West Mall
- Etobicoke, Ontario
- M9C 5J5
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