Archived from groups: alt.comp.hardware.pc-homebuilt (
More info?)
john wrote:
> "David Maynard" <dNOTmayn@ev1.net> wrote in message
> news:10j7o8ri87bep44@corp.supernews.com...
>
>>john wrote:
>>
>>
>>>how do i switch between 66 and 100mhz bus on compaq presario 4240es PII
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> 333
>
>>>?
>>>
>>>i believe it may be overclocked to 500 when it should be 333 at 5*66 it
>>>maybe 500 at 5*100
>>>
>>>this is causeing it to overheat and freeze up, i backed off to a 3
>>>multiplier and now it works underclocked and cooler but im not sure if
>
> its
>
>>>at 200mhz or 300mhz. meanwhile i will try to rig up another fan for it
>>>
>>>i find jumpers for multipliers of 3,4,5,6 etc but not for bus speed
>>
>>There won't be FSB jumpers on a Compaq motherboard because that's set
>>'automatically'.
>>
>>If it's overclocked, as you suspect, then they would have probably used
>
> the
>
>>'B21 tape trick' which causes 100/66 bus select to go high saying it wants
>>a 100 MHz FSB. The 'simple' way was to place a piece of tape over the pin
>>of the Slot-1 cart but some might cut the PCB trace for a more 'rugged'
>>solution. Generally they'd have to do a similar mod to the Vcore processor
>>voltage select pins because it won't run that fast at the stock 2.0 volts.
>>In fact, it's rare for a P-II 333 to hit 500 under any conditions.
>>
>>However, from the almost non existent documentation on the Compaq site, I
>>get the idea your motherboard doesn't even support 100 Mhz FSB so I doubt
>>it could be overclocked the way you suspect.
>>
>>Why do you think it's a P-II running 500MHz?
>>
>
>
>
> its overheating and freezing up so i thought it maybe overclocked, since the
> silk screen on the board has two columns of info for each of the jumper
> settings, i suppose its just locked at 66bus and maybe the other column is
> for future possibilities.
>
> btw it is an intel BX chipset FW82443BX 1997 with AGP set
In that case it's possible to overclock because BX is the 'official' 100
MHz FSB chipset for the P-II.
>
> i believe the fan on the power supply is too weak to cool thru the strange
> bafle they have in here, also no fan on the cpu heatsink just a baffle.
Common Compaq cooling setup for those. Works great when everything is as it
was intended to be.
> i
> plan to add another fan and try to get it back up to 333 its only at 200 now
> and yet it still seems pretty fast, anyway for 48mb ram, i also have 128mb
> pc133 sdram ordered
>
> thats another possibility in the BIOS it has fast Memory speed and slow
> memory speed, is the mem running async with the fsb?
No.
> i will get pc133 anyway
> but i considered that 100mem may cause 100fsb but prob not
Memory does not 'cause' the FSB. That is set by the processor 100/66 select
pin, as described above.
>
> thanx john
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>
>
>
>
>
>>
>>>any ideas
>>>
>>>thanx john
>>
>>
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>