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American Megatrends MAN-758 Computer Hardware User Manual

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MegaRUM PCI Motherboard User’s Guide6

Step 2 Configure CPU Speed

If using two CPUs with different speed ratings, set the motherboard jumpers to

the lower CPU speed. J21 and J24 select the CPU speed. The drawings on the

next screens show how J24 and J21 should look for each possible CPU speed:

CPU Speed J21 J24

120MHz OPEN Short Pins 1-2,

Short Pins 3-4

Short Pins 5-6

Short Pins 7-8

133 MHz Shorted Short Pins 1-2,

Short Pins 3-4

Short Pins 5-6

Short Pins 7-8

150 MHz OPEN Short Pins 3-4

Short Pins 5-6

Short Pins 7-8

166 MHz Shorted Short Pins3-4

Short Pins 5-6

Short Pins 7-8

180 MHz OPEN Short Pins 1-2

Short Pins 5-6

Short Pins 7-8

200 MHz Open Short Pins 1-2

Short Pins 5-6

Short Pins 7-8

210 MHz OPEN Short Pin 5-6

Short Pin 7-8

233 MHz Shorted Short Pin 5-6

Short Pin 7-8

240 MHz OPEN Short Pins 1-2

Short Pins 3-4

Short Pins 7-8

266 MHz Shorted Short Pins 1-2

Short Pins 3-4

Short Pins 7-8

Important

Please contact American Megatrends technical support at

770-246-8645 to support a CPU running at other speeds.

Cont’d

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