K6-III+ and motherboard voltage question \ VOGONS

K6-III+ and motherboard voltage question

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First post, by jolurove

Posted on 2015-10-14, 20:19

jolurove Offline

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Joined: 2014-10-13, 17:35

Hello.

I recently bought an AMD K6-III+ 450MHz from ebay, and it's core voltage is 1.7V, my socket 7 motherboard's lowest voltage is 2.2V. Can I use this motherboard with this processor? I wouln't like to fry them, since it wasn't that easy to find any of them.
I searched an answer online but I couldn't find it.
Thanks!

Reply 1 of 4, by Skyscraper

Posted on 2015-10-14, 20:22

Skyscraper Offline

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2.2V is OK but you need good cooling and dont go higher than 2.2V.

At that voltage the CPU will likely run fine at 6x100 MHz, 5.5x100MHz is guaranteed.

Normally a motherboard that can do 2.2V also can do 2.0V, but the setting isnt always documented. Often you have 4 jumpers, the first jumper adds 0.1V the second 0.2V the third 0.4V and the forth 0.8V, no jumpers at all gets you the minimum voltage of 2.0V. Check if this is how your voltage selection block works.

New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.

Reply 2 of 4, by jolurove

Posted on 2015-10-14, 20:49

jolurove Offline

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Joined: 2014-10-13, 17:35

Thanks! That was quick! I have one of those startech coolers.. I guess it should do. And I didn't quite get that last part. Do I have to measure the voltage directly from the motherboard with a tester? I'm a little slow, sorry. But anyway, if 2.2V is OK then I should just leave it there don't I?

Reply 3 of 4, by Skyscraper

Posted on 2015-10-14, 20:55

Skyscraper Offline

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Location: Sweden

If you have 4 jumpers controlling the voltage and the 2.2V setting is set with Open-Closed-Open-Open then your V-core jumper block probably works as I described.

Using the documented 2.2V setting is the safer route.

Reply 4 of 4, by jolurove

Posted on 2015-10-14, 21:05

jolurove Offline

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Rank: Newbie
Posts: 37
Joined: 2014-10-13, 17:35

OHH! I get it now! Sadly that's not the jumpers layout on mine 🙁
You've helped me a lot. This info may serve me for a future socket 7 motherboard purchase

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