Cyrix MII-300
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AMD K6-2
AMD K6-2 300
Cyrix 6x86 PR200
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Cyrix MII-300
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Dear CPU Scorekeeper

I have a Cyrix MII 300 machine, and wonder how to best upgrade. First of all, what's the best CPU I can upgrade to without replacing the motherboard (I know it will accept K6 processors, but I'm not sure about clock speed and other specs), and is it a good idea, after all?

Would it be a better deal to just replace the whole motherboard or system?

What's the best-bang-for-the-buck motherboard you would recommend for a medium-priced home desktop?

- - Italo, May 2000

See the questionCPU Scorekeeper Responds

To check out the standard clockspeed and voltage requirements for a compatible Socket-7 upgrade for your Cyrix MII-300, see our K6-2 stats page. Depending on your motherboard, you may need to flash its BIOS to recognise a new CPU.

If your motherboard can support the K6-2's normal bus speed of 100MHz, you could double the performance of your current system (see our CPU Comparator). Even if the maximum bus speed of your motherboard is only 75 or 83MHz (normal for the MII-300), you still may be able to run a K6-2, though you won't get the same maximum performance out of it.

Whether to upgrade just the processor or your whole system will depend upon your budget and how much you would like to enjoy today's newest games. For typical home use, a CPU upgrade would probably be sufficient.

A good source for motherboard comparison and recommendations based on your budget and upgrade needs can be found at

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