M571 500mhz processor incompatability

[Grim]

From what i read the m571 boards m571lmr and m571mr can support cpu speeds of up to 500mhz.
I currently have a m571mr with a AMD k6 2 400mhz processor.
I tried to upgrade to my 500mhz k62 processor but no matter what i did (changing cpu and multiplier frequencies) i could not achieve 500mhz.
I got 450 mhz TOPS and it would not boot, it gave me a error saying "-----trap exception---"
and lot of numbers (addresses i think) following.
The PC will only boot at a speed of 400mhz or lower.

Ive searched the threads on this forum but so far ive seen no post describing a problem just like mine.

Any suggestions?

[timmy]

Disk drives, memory, PCI cards, and the on-board video can all affect the ability to overclock, especially at 83.3 MHz front side bus speeds.

Actually, this subject has come up pretty often here, and that's why I wrote down the issues regarding this subject on the M571 website -- they came up so often it seemed a better plan than writing the same answers over and over.

[cricketmad!]

Grim,

Assuming the M571MR to be similar to the M571, you will need to set jumper JP5D to the 1-2 position to boot at 75MHz and 83 MHz FSB, even though the recommended setting is 2-3.

This will overclock the PCI bus, which may affect some of your other hardware. I've got two M571s, a 3.2 and a 7.0, and both operate happily at 500Mhz with JP5D in the 1-2 position.

This is all covered in detail on timmy's site.

Regards,

[grayboy]

The m571lmr isnt very good for overclocking - what is max bus speed available in the bios ? If it is only 75 mhz, then you may reach 450 mhz if you set the multiplyer to 6x - you may need to increase the core voltsage to run at the higher speed. If this doesnt work, then hard luck !!
graham

[alex zorrilla]

I suspect that either something on the computer cannot handle the higher FSB (on this motherboard, an FSB of 83 gives a PCI clock of 41 MHz, instead of its normal 33), or the motherboard is not giving the CPU enough voltage. I would put my money on the FSB, but try raising the CPU voltage a tad to see if it makes any difference.

[Grim]

Thanks Guys

Graham, the max fsb speed is 83mhz and mutiplier's max =5.5x.
Ive tried diffrent voltages and everything.
The only option i see now is to try out what cricketmad suggested, i think it might work seeing that the m57MRs are in fact simmilar to the m571s:rolleyes: .
I think alex might have a point too, ill try removing all disk drives and pci Cards and see the result.:)

[cricketmad!]

AMD processors recognise the 2x setting as 6x; so if you succeed with your 83Mhz bus, change your multiplier to 2x and "hey presto" you'll get the magic 500Mhz!

Regards,

[grayboy]

The boards are similar, but the lmr series control the cpu in the bios( aka M598/599 boards) whereas the 571 (non lmr) are controlled by jumpers -
I think there maybe some confusion with these boards
graham

[Grim]

I think you right Graham, but let me get something straight. Are you saying that the only way to configure the FSB and multiplier speeds with the normal M571s, is with the jumpers?
If so then my board would probably fit in the same gategory as the M571LMRs
(in terms of how the cpu speeds are set) which would unfortunately negate cricketmads' earlier suggestion.
Left at square one here guys,
how can I using the bios' configuration achieve a processor speed of 500mhz with my K62? (and have it boot, which is my real prob).

Oh, by the way cricket, I have the manual for the M571lmr and there isn't a JP5D

Thanks in Advance

[grayboy]

Grim,
Yes, the cpu of the 571 is controlled by setting jumpers on the board, for bus speed,multiplier and voltage - they dont have any cpu setup options in the bios.
Your board, being a 571mr has the odd jumper for bios reset,audio and video
and controls the cpu in its bios. Cricketmad is correct that the amd sees 2x as 6x but I think this applies to jumper settings only and not in a bios control
scenario.
If the max bus speed is 83 and the max speed is 5.5x, then 460(457) is the fastest speed your board will setup to,thats if your processor will run at that speed.
I have several M571 boards,none of which will run at 83 bus speed using an amd k6/3 450 processor, the fastest I can obtain is 450 using 75x6 (2/6x) and yes, I've tried all setting and it wont run stable at 83 mhz.
I currently run my k6/3 in a Soyo sy-5ehm which has 100mhz bus speed,agp graphics and 1mb on board cache, it really is a smooth running machine.
graham

[timmy]

If you can do 83 FSB (83 x 5.5 = 457) without trouble, then your problem most likely isn't something on the board, like cards, drives, or memory. The only difference between 457 and 500 would be the processor. Remember that AMDs like to be at least at spec, if not higher regarding core voltage. If you have a 2.2v cpu, shoot for around 2.35, recalling that your measurement will be a bit higher than what the cpu actually sees. If you are running a 2.4v cpu, you will have less room to play with. I would start feeling really leary about going over 2.5v, myself. But, if you can make 457 with a 500 MHz rated processor, I'd be thinking that success may be close.

There's only one way to find out, but remember that there's always a little risk involved. You might not make it, and bad things can always happen. Not trying to discourage you, but just reminding you that you are pushing it. There was a fellow who posted K6 2 numbers for 500 MHz that I saw, and they were impressive.

Good luck.

[Grim]

Thnkx PPL

Graham, your right. The fastest bus speed that I have reached and actually seen the bios start up with is 450mhz. Try to go any higher, and I wont see anything on the monitor.
The CPU does recognize 2x as 6x in the bios though, the trouble is that when I try to let my PC boot at anything over 400 (in the last case 450mhz) It (occasionally) passes the ram check and goes on, and then right before I should see the OS loading, it comes up with that error I was telling you about"-----Trap Execption--" with gibbrish following.
So you see, the PC does come up with a speed of 450mhz, but it wont boot.

[grayboy]

Grim
What happens if you wind the cpu core voltage up, as per timmys post ?
graham

[Grim]

Well graham,

Let me say first that the core voltages stated onmy K6/2 chip is 2.2/3.3

I was trying out what you guys suggested and...
I really wanted to give specific results for each attempt, but it turns out they're diversed.

Keep in in the FBS for all these tries is (2.0x x 75x)

I tried 2.2 volts- "IRQ not equal or less" on boot
when i tried that fsb at 2.3 volts (i cant get 2.35, there are no decimal settings) It stoped at boot screen once, gave me the IRQ error, and the other times it went into windows and hanged.

2.4v - wouldnt pass drive detection, even though it detected the drives, and displayed them (as all the others voltages did at least once!) The other time it give me the "IRQ not equal or less" error

3.3/3.2v goes into windows and hangs.

Im going to try 88.3 x 5.5x now as timmy was saying.

Suprisingly this time around, I didnt get not even one of those trap exception errors (probably has something to do with the fact that is was using onboard video).

Any Ideas Guys/

[Grim]

Nope, no luck on 5.5 x 83.3. It won boot at all

[cricketmad!]

Grim,

Can the PCI bus speed be adjusted in the BIOS?

With the "ordinary" M571, the point of jumpering JP5D in the 1-2 position is to keep the PCI bus at half the CPU speed, because the K6-2 must be synchronous with the CPU clock. The normal PCI bus speed of 33Mhz is fine at 66MHz FSB. At 75Mhz FSB you will need a PCI bus of 37.5, and at 83.3 Mhz FSB you'll need a PCI bus of 41.65.

Regards,

[Grim]

No cricketmad

There are no such options in the bios, and my manual which is really a m571lmr manual, but it's basically the same, I think (and hope), doesnt show me any jumper responsible for anything like that either.
I'm beginning to lose hope of getting my PC to work at 500mhz:(


PS
If any knows where i can get software to flash my bios I'd really appreiciate it.

[tazwegion]

Well assuming the LMR is similar to the standard M571, you'll find the updated BIOS & flash utility @ Timmy's M571 page (http://m571.com/m571/index.htm) :cool:

EDIT: BTW the whole 2x 6x multiplier thing, relates to AMD remapping their K6 series processors to recognize (as cricket said) 2x as 6x multi because @ the time many people wished to upgrade their CPU's but not motherboard 66fsb units, 6x66=396Mhz perfect for the K62-400, making AMD an affordable upgrade path for consumers (pretty good business stratagy from AMD) :D

[alex zorrilla]

Well assuming the LMR is similar to the standard M571, you'll find the updated BIOS & flash utility @ Timmy's M571 page (http://m571.com/m571/index.htm) :cool:
Unfortunately, it is similar, but it is not the same. It uses a different BIOS than the plain old M571.

Try this: http://www.pcchipsusa.com/support-pcchips-bios.asp

[Grim]

Thanks Alot Alex, I'll check it out and then post you on how it goes.
BTW I changed my OS to XP and well.. there are less reoccurences of the IDE prob, but it does come up reinstalling now and then.
I love win2000 but I think i'll stick with XP for now though, simply for that reason.