PB 850 M/Board - CPU Upgrade Info

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This motherboard can accommodate the following CPUs:

• Intel P54C/P55C: 75 - 233 MHz
• Cyrix 6X86/6X86L, PR120+ - PR166+
• Cyrix 6X86MX, PR133+ - PR233+
• Cyrix MII: 266 - 300 MHz
• IDT C6: 150 - 200 MHz
• AMD K5
• AMD K6: 266 MHz
• AMD K6-2: 300 - 333 MHz

Zero Insertion Force (ZIF) socket. Uses the 321-pin Type 7 CPU Socket. Not keyboard switchable. Disable cache to slow down the system. The following tables contain settings for some of the more common CPUs.

* The "I/O Voltage" jumpers (JP5 & JP6) are only on revision B motherboard. Not on revision D.

AMD K5

AMD K6

Model 6 is .35m
Model 7 is .25m

AMD K6-2

Before installing a K6-2, ensure that you have upgraded the BIOS to at least version 1.07.

** 66 MHz bus only. AMD shipped the K6-2/300 in both 100 MHz bus and 66. This motherboard doesn?t support 100 MHz.
*** 66 MHz bus only. AMD shipped the K6-2/333 in both 95 MHz bus and 66. This motherboard doesn?t support 95 MHz.

Cyrix 6x86

Note: Some versions of the 6x86 have a Core and I/O voltage of 3.3V instead of the 3.5V listed above. Ensure which voltage is needed (it should be listed on the CPU itself), and change the voltage if necessary.

Cyrix 6x86L

Cyrix 6x86MX

Cyrix MII

IDT WinChip C6

Intel CPU