Have a Shuttle Hot 591 which had a Pentium 233 MMX, it died. Install new cpu AMD K6 2 450mhz, the computer screen reads Unknown-S CPU at 400Mhz, it will test memory but after showing the Awards Bios Extensition line the cursor just sits there blinking. Sometimes it will allow me into the Bios and other times not. Is it a bad cpu or is me the end user and if so what can I do.

Forgive me if I ramble in many directions...

Any idea on what killed the first cpu? Possible that the same thing damaged your motherboard (like a power surge)?

Voltage - both the pentium mmx and the k6-2 are dual voltage processors that newer socket 7 boards support. However, they do run at different core voltages - the pentium 233 mmx should be at 2.8v (+ or - .1) and the k6-2 450 should be at 2.2 volts. Did you change the settings for the voltage? Newer processors will auto config for the voltage but sock7 mobo's won't.

I've also had a few older socket 7 boards (a PC Chips flashes in my mind) that required a bios flash to properly recognize a k6-2 chip.

Thanks to your reply, not sure what happen to the old cpu, I just know that installing to my other computer nothing happened. On voltage the MMX was at 2.8v/3.3v (auto detect) the k62 had to be manually set at 2.4v/3.3v. Can't flash the bios because I can not boot up on a startup disk or, matter of fact, do anything. What can I do next?

Hey BigDog,

I assume that you installed a good HSF with the AMD CPU? Did you use thermal grease between the CPU and heatsink? If you did, did you clean off the old stuff first? Can you feel the processor to see how hot it is? If you can't hold your finger on it, then it's too hot.

Since the system is recognizing a 400Mhz processor, and the processor is really a 450Mhz, you must not have the FSB and multiplier set correctly.

Maybe you should try going with a smaller multiplier. Your processor will run slower, but maybe it will at least run. I also have a K6-2 450Mhz processor, that wouldn't run right unless I backed off on the FSB and multiplier to effectively run it at 417Mhz.

Post back with your progress.

Big Blue 66


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