Bios incorrectly identifies k6-2 400

[sfarley]

I have a Matsonic 6260s motherboard with an AMD k6-2 400 processor. I set the jumpers at 100MHZ x 4.0 multiplier. On boot-up the bios reads k6-2 450! SiSoft identifies the cpu as a 400 and reports tests as 401MHZ performance rating and pentium performance rating of 461MHZ. I don't have any lockup problems. Does the fact that Bios doesn't recognize the chip properly mean anything? If I try to overclock, it locks up on boot-up and still identifies the speed wrong. Thanks for any info......

[Bleeding Edge]

Your memory bus speed is not set to the proper frequency. If you are using PC100 compliant RAM a bus setting of 112MHz will result in such a matter as you discribed.

[JimS]

Some boards BIOS not set up to identify certain speeds. Although 400 is common, maybe that is the case. When I try to get 4 x 95 = 380 mhz on my board, BIOS reports it at 350.

[Sammy]

Hi,

I have exactly the same setup with the same result.

Edge, I believe you are talking about the front end bus speed, which if you are is not possible on this motherboard since the maximum allowed by the jumper setting is 100Mhz.

I believe this is likely to be just a "bug" in the BIOS itself, mine is dated 19/12/98, and I guess if you have just got your board it will be the same. Since this revision was released to support the 400Mhz K6, I am currently watching the Matsonic website for a BIOS update.

For curiosity's sake, I am presently trying to overclock my CPU to 450Mhz, ( 100Mhz bus, 4.5 multiplier ) and got it running stable by upping the core voltage by 0.1 volt. Interestingly, it still reports the CPU speed as 450Mhz, although I am trying to benchmark the system to see if there is any performance increase.

Its nice to know I wasnt alone in this problem, and I'll keep you posted about the benchmarking.

Cheers

[Sammy]

Hello again,

well I tried benchmarking my cpu with the speed genuinely set to 450Mhz, and it showed an increase in performance of about 12 - 15%.

The BIOS still reported it as a 450Mhz AMD.

But, when I set it to 500Mhz, the Bios reported it as a 500Mhz CPU. So it looks as if the problem is bios related...

I am going to set it back to 450Mhz now and see how well it runs long term.

Hope this helps.

[duh]

Sfarley,

Do you know the date your bios was made? I know there is a bios that you could change the bus speed during the setup. I think made after 10/10/98 has this option. If so try changing "Host Clock" to disable when you change your jumpers.

[This message has been edited by duh (edited 03-12-99).]

[This message has been edited by duh (edited 03-12-99).]