I've just bought a TX 2 Pro Main board and an IBM 686mx PR300 CPU to upgrade an old Olivetti P66.
I am trying to set the board up so that I can get as close to 300MHz on the CPU as possible, however IBM states that the fastest clock multiplier that I can use with this CPU is X 3.5. This means that I would have to use an external clock of 83MHz.
Now I only have 72 pin SIMMS and I was told that they would'nt be able to cope with a bus speed of 83MHz. I was also told it would be better to set the external clock speed at 66MHz with a clock multiplier of X 4.5, however this exceeds what IBM have stated.
and the answer is ;-)
the PR300 in the processors name is its performance rating and not the maximum clockrate support by the CPU, it just means that cryrix rates the CPU to be as fast as an (nonexistant)
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