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Upgrading Cpu On A Tyan S1854


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#1 Alchemist

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Posted 29 March 2007 - 04:04 PM

I've got a fairly old computer, a Tyan S1854 (also called 'Trinity 400') with a 700 Mhz Celeron on it. This board actually has the Slot 1 as well as the socket 370! This CPU is really barely adequate to run Windows XP, so I am thinking of upgrading to a real P III since they are now quite cheap. This board is supposed to to support up to 1 Ghz CPUs. But the manual was written in 1999 and is not absolutely clear that the Socket 370 supports any P III up to 1 Ghz, it only mentions the Celeron. The first thing I want to do is be absolutely clear that this Socket 370 interface is the same on all MBs and it will indeed take any FCPGA I Pentium III.

After that, I am curious about the difference in heat output between the Celeron and the P III. Is there are large difference at the same clock rate? Or will a heatsink designed for the Celeron handle a P III just as well? What about a somewhat faster P III like 800 or 933 Mhz? If this would not be sufficient, I need to figure the cost of a new heatsink into the upgrade because this board doesn't seem to have a heat sensor and I can't risk overheating. AND there is one more oddity. Searching for information I've found some reports that the default heatsink that came with the retail P III didn't fit on this board. If the spec for the design was well defined, I can only guess that some part of the board got in the way. Does anyone know what heatsinks are known to work on the Tyan S1854?

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#2 acklan

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Posted 29 March 2007 - 11:24 PM

There is an option that will increase your processor from a 1.2ghz to a 1.4ghz Celeron. This works I have 13 computers, P-III's 500mhz, that I installed the adapter into. It is plug and play and it works.
I am running XP Professional with 768mb of PC100 RAM.
On ebay you can find the older P-III slot 1 adapters which they no longer make.
If you have your computer setup like you want, but need more processor this maybe what you need.

http://www.powerleap.com/PL-NeoT.jsp
http://search.ebay.com/search/search.dll?h...8%26catref%3DC6
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#3 Alchemist

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Posted 30 March 2007 - 06:27 PM

Isn't the primary limitation of the Celeron the front-side bus clock? I think it would be easier to just put a P III at 100 or 133 Mhz FSB into the socket than get some special adaptor to connect a later Celeron than the board was designed for.

The only thing holding me back from just buying one on eBay right now (cheap!) is the question of heat output. The P III had more on-chip cache than the Celeron, right? Did this make a big difference in heat output?

#4 acklan

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Posted 30 March 2007 - 09:53 PM

8 of my computers have been running on this adapter for 3+ yrs. Never had a problem. I even had a Dell 266mhz PC66 running at 933mhz on a 1.4Ghz Celeron chip.
Heat has never been an issue. It is worth every penny if you just want to bump your processor and not get a new computer.
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