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Socket 7 vs Socket 5 OverDrive confusion

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First post, by racingthebeam

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I recently picked up this lovely Olivetti P133S and I'd like to upgrade it to a 166MHz MMX but there's confusion between the manual (attached) and what's actually on the motherboard.

The manual describes the processor socket as an "Intel OverDrive Ready Socket 5", but the socket on the board itself clearly says "Socket 7" (and the pinout does indeed look to be that of a Socket 7, with the extra pin present in the bottom right corner).

Being very unfamiliar with this era of chips I'm unsure what my upgrade options are here. Like I said, I'd like to have an MMX. Do I need to track down a Socket 5 166MHz OverDrive or would a standard Socket 7 MMX do the trick?

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Reply 1 of 4, by dominusprog

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Well if motherboard supports MMX processor is possible to upgrade it to 233MHz.

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Reply 2 of 4, by Gmlb256

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The Socket 5 Pentium MMX OverDrive can be installed on Socket 7 motherboards, but if the motherboard provides dual split rail voltage (which doesn't and it lacks the 2.8v core voltage according to the manual), then it is preferred to get a regular Pentium MMX CPU.

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Reply 3 of 4, by racingthebeam

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Gmlb256 wrote on 2023-10-25, 18:52:

The Socket 5 Pentium MMX OverDrive can be installed on Socket 7 motherboards, but if the motherboard provides dual split rail voltage (which doesn't and it lacks the 2.8v core voltage according to the manual), then it is preferred to get a regular Pentium MMX CPU.

Thanks, this is exactly the information I needed.

Reply 4 of 4, by dionb

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Socket 5 vs Socket 7 is fundamentally about the presence of the second multiplier pin, BF1. So5 only has BF0 so can only select 1.5x or 2.0x, So7 can also select 2.5, or 3.0x..

Additionally, So7 allows for optional split voltage plane, required to support Pentium MMX and later CPUs, but by means all So7 have that; as a rule it will not be implemented on any i430FX boards (like this one).

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