VOGONS


First post, by idan182

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Hi all
I have a 430TX Totem Socket 7 Motherboard with 233MMX CPU
it supports up to 75mhz, and it's the currently settings with 3.5x
The CPU original voltage is 2.8.
When I overclock it to 266, It's only stable with voltage of 3.38.
I tried 2.9, 3.2 but it restarts on dos games suddenly.

It has a heatsink + fan which is hot to the touch but I can stay my hand on it.
I have seen people wrote that they overclock with original 2.8 voltage.

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Last edited by idan182 on 2022-04-16, 08:10. Edited 1 time in total.

Reply 1 of 13, by zyga64

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I think it is not worth to torture Pentium MMX with such a high voltage. Performance increase is minimal and you risk burning your CPU.
If your motherboard supports lower voltages, you may try AMD K6-2 400 MHz (it interprets 2x multiplier as 6x - so 6x66MHZ = 400MHz).

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Reply 2 of 13, by Tetrium

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The pic of the heatsink is from a top angle, so it's hard to judge the height of the heatsink but it looks like one of those models that are very flat.
I wouldn't be surprised if you could get the CPU to remain cooler if you upgraded the HSF.

Btw, the 2 higher fins on either side of the heatsink don't count 😜

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Reply 5 of 13, by NostalgicAslinger

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Every 233 MMX should run with 262 MHz (75MHz FSB) at the stock voltage. My best Pentium MMX P55C runs with 300 MHz (100x3) at 2,8V stock voltage! Try out a better heatsink with a thermal compound on the CPU core.

I use this Socket A/370 heatsink on my MMX 233@262MHz (75MHz FSB) 2,8V. Also runs fine with 291MHz (83MHz FSB) at this voltage, but for daily use, 262MHz is more than enough for a MMX machine.

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Reply 6 of 13, by Cuttoon

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Better heatsink couldn't hurt, that's quite a bit of overvoltage.

The Gigabyte GA586TX3 actually had a temp sensor under the CPU.

In any case, you're risking a five Euro CPU.

I like jumpers.

Reply 7 of 13, by NostalgicAslinger

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Cuttoon wrote on 2022-04-16, 12:31:

In any case, you're risking a five Euro CPU.

Yes, if you have luck to find one for this price on the flea market...The Ebay Price of a 233 MMX is around~19€.

Reply 8 of 13, by Cuttoon

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NostalgicAslinger wrote on 2022-04-16, 13:27:
Cuttoon wrote on 2022-04-16, 12:31:

In any case, you're risking a five Euro CPU.

Yes, if you have luck to find one for this price on the flea market...The Ebay Price of a 233 MMX is around~19€.

OK, it depends on the looks and that's basically the "wholesale" price:
https://www.ebay.de/itm/4-x-Intel-Pentium-MMX … 5-/284661089629
Interesting that there's always a gold digger bidding about 9.58 € for these. Including some margin, that might be the hard price floor for any CPGA Pentium 😉

Well, let's say if he burns it, there's the learning experience and the excuse to invest in a fancy K6!

I like jumpers.

Reply 10 of 13, by Cuttoon

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idan182 wrote on 2022-04-16, 15:52:

I can see my motherboard supports up to 300mhz K6
Its a socket 7, not super

430TX was a late chipset, the last by Intel. They all should do k6-2, if not III+

I like jumpers.

Reply 11 of 13, by waterbeesje

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Some socket 7 board do support lower voltage. As does my IBM aptiva, supports 2,2v on a Ali IV chipset. And I've got a s7 boards with sis chipset that supports 2,0 and up the way any super7 does.

And I can agree with most people: the sink you use is fine for stock MMX, but for oc I'd recommend a large sink as well.
I
've ran my 200MMX at 300 (3x100) with 2,9v for some time with a socket A cooler which has a copper base and aluminium fins.
Also had one at 3,5x83 on an Intel chipset for a while, but the SCSI controller began to bug. Probably the PCI speed was to much for it. It now runs a cyrix MII at 225MHz and 75MHz bus.

Stuck at 10MHz...

Reply 13 of 13, by NostalgicAslinger

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idan182 wrote on 2022-04-16, 15:52:

I can see my motherboard supports up to 300mhz K6
Its a socket 7, not super

I would stay with the 233 MMX and change the heatsink to a better one. A MMX CPU is better for DOS Gaming, because of THIS.

And HERE is the Setmul Test with Wing Commander 1 on my 233 MMX System.