Posted on 1999-01-10
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.
Can anyone give me some good advice here.
Thanks in advance