K6-2 400 on older boards topped out a t 233mhz

[CMonster]

Don't mean to bore those who have been around a while....I just want to make sure everyone is aware of this because I think it's great:

If an older socket7 motherboard supports the propper core voltage for a K6-2 then the K6-2/400 can be run at 400mhz (396) even if the board's top rating is only 233mhz.

How is this possible? Because the K6-2 400 has a remapped multiplier; that is, if you set the board to 2x66 the AMD K6-2/400 multiplies the bus speed 6 times. AMD designed it to do this. I do not know if any other speed AMD chips do this, and I tend to think not, but I have personally done this upgrade 3 times and it works great.

[MR COMPUTER]

HI CMonster. This is something I am going to try. What boards have you done this on so far? http://www.sysopt.com/forum/wink.gif

[800XL]

The biggest hump to overcome with these setups is getting a board with voltage support down to 2.2-2.4v. Typically, if the board supports that on its own, it will support multipliers up to 6x as well. Cmonster is right that newer AMD chips (CXT core K6-2, and all K6-3) will run at 6x when set to 2x. I think the idea was two pronged: To support higher multipliers for future core speeds (600Mhz) and to work better with upgrade manufacturers' parts as well as older motherboards that lack bus speeds of 100Mhz or more.

[CMonster]

Mr. Computer;

I have done it on this generic 430TX "CompUSA" board that I inherited with a $50 system (I don't know who makes it, but I am using it to post this..no jumpers only dip switches - settings are written on the board) and I have done it twice with the Shuttle Hot 569 (for complete jumper settings you have to get them from the website). Both boards have voltage support but not multiplier support. There is a voltage adapter available for older boards, but it is almost as much as a new motherboard $50.

One more thing, I have found that the chip runs a little hot at the 2.4volt setting - 2.3 seems about perfect for me - but then again I think it was 102F in the San Fernando Valley today and maybe 95F inside my house (only swamp cooling).

[This message has been edited by CMonster (edited 07-13-99).]

[Paulo]

Hi
Before Asus P5a-b I had P55T2P4 and used AMD K6-300 on it.
I found some insteresting info here which may be of some help

http://www.jump.net/~lcs/kalle/rev3.htm

Regards

[UpGrD]

Any one running there K6-2 @ 2.5? I want to get some more life from my Abit AX5.
Later........

[MR COMPUTER]

CMonster. Your generic board might be an Amptron PM9600. I have one and I will try your idea... Thanks. http://www.sysopt.com/forum/wink.gif

[CMonster]

Thanks Mr. Computer, I will compare the board online to the Amptron - it would be nice to know what board this is.

UpGrD, I have run K6-2s at 2.5volts core while testing overclockability (and 2.6 - all the way up to 3.0 but that was using liquid cooling down to about 55F) if you intend to run one at 2.5 core voltage you should have extra cooling, otherwise the chip will tend to overheat.

[AuraEdge]

Wow...sweet, you mean i can take a 50-70 dollar K6-2 and shove it in my 233MMX AT box? (66 bus x 2, 3, 3.5) Wow..it'd be like another GOOD comp (32 ram but still..itd be sweet)
I have a compaq sniper Mobo...kinda bites..is that chip in it a SIMM or a onboard cache? I cant really tell...anyone know?its the only stick in it..and its an itegrated Mobo.

[This message has been edited by AuraEdge (edited 07-14-99).]

[MR COMPUTER]

Update. Tried a K6-2 350 on the Amptron board today. At 66x2 @2.2 volts - It posted as a K6-2 400! Unstable in Windows.Next step- Raise the voltage and improve the cooling. http://www.sysopt.com/forum/wink.gif

[UpGrD]

Thanks CMonster I'm going to have to fire that baby up! (oop's did I say fire?)

[Variable]

Do you know if this is possible with an Asus P55T2P4. I know it only has 2.5V, but what if you cool the CPU real good?
Does anybody know if it is true that this motherboard has 3.5 Multipler setting?
What is the Jumper setting??

[wyvrn]

Hey cool tip thanks. If I come across an old mobo, I know what I am going to do with it http://www.sysopt.com/forum/smile.gif .

[shadow]

That is cool. I have a Tyan 1576 running a 166mmx and I see that the mobo is capable of a voltage range from 2 - 3.5v, cpu multipliers of 1.5, 2, 2.5, 3 and fsb's of 66, 75, 83. But of course the manual only lists settings for cpu's to 233. The 400 should work on this board if set at 2.2v and 66x2, right? I just may have to try your idea...anyone have an AMD 400 for sale http://www.sysopt.com/forum/smile.gif
PW

[This message has been edited by shadow (edited 04-04-2000).]

[Brydon]

Variable..2.5v should be ok, just make sure you have a good hs&fan http://www.sysopt.com/forum/smile.gif

[shadow]

I've been told the K6-2/350 will easily handle running at 400 in a board like this, and the 350 can be had for real cheap. I think I'll give that a try as soon as I find a cheap one to buy.

[Glytzhkof]

Hey! I too have a Asus P/I-P55T2P4 motherboard and would like to breathe some new life into it. As somebody else wrote it only has 2.5 V, but maybe I should give it a try?

[Johnny]

I am running a K-2 400 on a Shuttle 569 ver.2. Had to flash the bios, but it runs great!

[CMonster]

Yes, longer life from older motherboards!

As long as this thread has been revived, let me add that on many older boards the BIOS does not enable the write allocate feature of the K6-2 , this causes writes to memory to be painfully slow. There are a few ways around this, one is to use the "Control Panel" available at www.powerleap.com (http://www.powerleap.com) listed under "Free Stuff" there is no direct link. Another I have recently been told about is "Cpuidle," and there is also a program called "SetK6."

It is important to point out that not all motherboards will work with this trick. I have had a couple of problems with generic non-intel VX and TX "Pro" motherbaords. Also any motherboard that BIOS does not recognize the Standard K6 chip .