Will I fry my K6-2 500 at 3.3V?

[Keermalec]

Hi, I'm thinking of upgrading an old Pentium 75 to a K6-2. The motherboard has jumpers for 1.5x or 2x multiplier and 50 MHz or 60 MHz FSB, but no voltage jumper: it is stuck at 3.3V. I know my K6-2 500 will map the 2x multiplier to 6x so I can potentially get 360 Mhz (woohoo) but, can it take 3.3V or will it fry before my eyes?

[Etruscan]

And besides the voltage which definitely - for sure - will fry your processor, you will have problems with BIOS recognition which will be, quite probably, insurmountable.

[vagpap]

Hi there

I believe that this kind of voltage is way too much for this processor. All the o/c tries I have seen set as max voltage 2.8-2.9 with the best cooling possible.
If you can't afford losing your K6-2 don't try this.
500@360 doesn't really worth the trouble (i think) because of the very low FSB.

See you
Vangelis

[Bovon]

3.3 V-core is 1.1 volts over the standard V-core for K6-2 cpus. Even with the best sink available, I doubt it would last long enough to get into Windoz, unless you could someway chill it with freon or nitrogen... http://www.sysopt.com/forum/biggrin.gif

[richamies]

Will I fry my K6-2 500 at 3.3V?

Yes.

Have a look on eBay for a Winchip, I think these take care of their own multipliers but I'm not sure.

If you can't get one or it's gonna cost you more than a few dollars, I'd say it's not worth looking hard for. Memory makes a far bigger overall speed improvement compared to a jump from 75 to 150 or 200mhz - I'm using a P150 as I type and it's fine for normal use, but could use a bit more memory than 48mb.

--Rich

[Keermalec]

Heh, I think its quite clear, this baby is way too old for a K6 upgrade. The Winchip idea is good but not sure if I can find one. Anyone heard of any other chips that will support 3.3V and 1.5/2x multiplier?

[Peter M]

math ... you have a 3.3V supporting board there, most likely with a 5-Amperes (or so) linear regulator.

K6-2 at 360 MHz and 2.2V draws around 8 Amperes already, 12 at 3.3V. AMD rates the "Absolute Maximum" voltage at 2.5V - this is the voltage at which it WILL take physical damage.

So it's just a question of what will blow first, the CPU or the board's voltage regulators.

In other words, forget it.

regards, Peter

[araaraara]

Get a winchip2-3d. It is the best that an old motherboard will take and is much better that that old 75. I was in the same situation with my p75. My winchip 233 added 2 years onto the system's life.

[rbirtwistle]

At 3.3 volts you will most definately fry your K6-2. I know because I accidently fried my K6-2 350 changing the voltage when I in error put 3.5 on it changing jumper settings. It literally went up in smoke in 3 seconds and also killed the mobo dead. Get a SS7 board which has the right voltages.

[Hellmund]

Considered one of those evergreen upgrade cpu's. Run fast in really old boards....Not sure on speficics of them though, think Richard Cranium had a post about em a few days ago.

[Raphaël]

<<
will it fry before my eyes?
>>
Yes.
You can find a K6-2 233 3.3v for few $ or an AT SS7 board like FIC VA-503 if you already have the K6-2 500.
Your old motherboard uses EDO Ram and upgrading to a new CPU is useless if you can't have enough memory.

[Wizzard~Of~Ozz]

Changed post.

It probably wont work, I wouldn't waste a chip to find out, it's pretty much doomed to pop.

[This message has been edited by Wizzard~Of~Ozz (edited 09-06-2001).]

[Keermalec]

OK, got a last option: I have an old Pentium 233 MMX left over from a system which I recently upgraded to K6-2 500.

This Pentium runs at 2.8V (with 3.3V core) and maps a 1.5x multiplier to 3.5x.

My mobo offers a 1.5x multiplier and 3.3V (with 5V core). The chip can probably take 3.3v instead of 2.8V but will it take 5V core instead of 3.3? If it does then it will run at 3.5x60 = 210 MHz!

Am I right in thinking the core will take this extra voltage, or will it fry?

[This message has been edited by Keermalec (edited 09-12-2001).]

[Bovon]

Will it take 5 volts? no

Will it fry? yes

[Keermalec]

Lol, thanks. Seems this ol' Pentium 75 is doomed...