vintagely wrote on 2022-08-06, 18:22:It is VERY similar just a couple chips are kinda different (the BESTKEY one is in place of a VIA-II VT82C42N chip) and there ar […]
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Sphere478 wrote on 2022-08-06, 17:27:Is this your EXACT board? Same chips? Heatsinks, configuration?
https://www.ultimateretro.net/motherboard/image/35-8258-00-5fbe […]
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Is this your EXACT board? Same chips? Heatsinks, configuration?

It is VERY similar just a couple chips are kinda different (the BESTKEY one is in place of a VIA-II VT82C42N chip) and there are NKK chips near the EDO/FPM banks.
Sphere478 wrote on 2022-08-06, 17:27:
I see that it has two regulators. One on each side of the heatsink. But you say only one is installed?
In fact there are 2 on both sides. they are different, but 2 they are. Otherwise, the pentium MMX would be gone/failed long ago i guess
Sphere478 wrote on 2022-08-06, 17:27:
The regulators on your board are linear, so likely even if you did have both there are no (easy) hidden settings. Getting a lower setting likely requires using a resistor jumper or changing a resistor or using multiple jumpers.
That's bad news. How do you tell they are linear? Just to educate myself i'm totally n00b on this side.
Sphere478 wrote on 2022-08-06, 17:27:
Being linear they will make a lot of heat. Especially on more advanced low voltage cpus.
So basically a 400 mhz k6-2 will make regulators reach critical temp in like a minute of 100% usage?
Sphere478 wrote on 2022-08-06, 17:27:
Your 200 might support 3.5x most are locked though. But some are unlocked. Just try it, and find out
Is there a way to discriminate just by looking at the CPU? (serial number..) or i just have to set 1.5x and 66 mhz bus on the jumpers and see if that works? it's a black chip i heard they may be unlocked, or maybe not.
Sphere478 wrote on 2022-08-06, 17:27:
Higher fsb: we need a close up pic of your clock gen. So we can look up the datasheet.
Dunno where is the clockgen. Can you kindly help me locate it on the same picture you posted before?
Okay, if there are two regulators and you have the jumpers for the voltages then it is probably a dual plane board.
This is the clock gen
The attachment 069A8D5B-367F-4FF4-844D-F801B0AC9CB0.jpeg is no longer available
Just set 1.5x and see what happens. There are no markings to tell you, it is simply try and see.
I have a few 200 mmx chips that will do 3.5x but most of mine don’t.
You could try the cpu and find out 😀 but more current at less voltage means more heat. If it were mine I would probably risk it. But your call.
Btw, idk if you were trying to find the fastest chip for your board with what you got, but a k6-2+570 modded to 3+ is the best you can shoehorn in there. Also it’s a mobile chip. So if you can get down to say 2.0-2.2v it should be rather conservative on the wattage. And have more performance at 400 mhz. (If you are goin all in may as well fo all in)
Don’t try a + with more than 2.2v
If 2.5 is all you can get then a k6-3 non plus is your best chip.
That’s a lotta juice for those rega though. Try and see. If they are getting really hot then may wanna reconsider