On 24 Feb 99, at 22:16, Dave Jones wrote:
> A friend has a HX motherboard and had a Intel P75 chip on it..
> Worked fine.. He wanted to upgrade it to a P233 MMX but the board
> didn't like the chip, so he swapped it for a P200MMX which the store
> said should work. We tried every way to get it to work, wouldn't
> even boot up. here's what the book says:
>
> *
> The motherboard is a 4-layer, 2/3 baby AT size high-performance
> mainboard. It includes Intel 82430HX system chipset Winbond W83877
> Super 1/0 controller.
>
> 1.1 GENERAL SPECIFICATION
>
> Processor
>
> * Intel Pentium P54C series - P54C, P55C (MMX)
>
> * Cyrix 6x86/6x86L series
>
> * AMD-K5/K6 series
>
> * The mainboard can run with following speeds:
> 75, 90, 100, 110, 120, 133, 150, 166, 200 and 233 MHz
>
> Chipset
>
> Intel 82439HX (Intel 82430HX System Controller)
> Intel 8237 1 SB (PCI ISA IDE Xcelerator)
> Winbond W83877 (Super 1/0 Controller)
>
> Cache Size
>
> * Sychronized Pipelined Burst Mode SRAM to achieve the high Pentium
> system performance.
> * Cache size is 0/256/512KB.
>
> Now does this say it will run a P200MMX? If not, what's the fastest
> I can stick in there? According to the book, I should be able to put
> a P200 in. Any ideas? Thanks Dave Jones
Both the 200MMX and 233MMX *should* work in that board, according to
what you've quoted. Note that these chips use a reduced "core" voltage
-- the board should provide some way to set this. [On some VX boards,
this was by way of an optional/unobtainable VRM (voltage regulator
module), but I don't recall ever seeing that on an HX board.] The fact
that 233 and MMX are listed suggests that this is one of the later HX
boards, so it should have voltage regulation on board -- but you do
have to set the jumpers to use it.
David G
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