You can put a socket 5 processor on a socket 7 but not vice versa. Your only option is Pentium Overdrive.

https://web.archive.org/web/20070504165927/ht … b/CS-001826.htm

Or use it with WinChip 200GA 200MHZ(tested, its like +- 133MMX performance) or other WinChip(s)

Also, not all Plato revisions support 66MHz FSB, so in that case not even a P100 would work.

So make sure what version of the board you have.

dominusprog wrote on 2024-04-17, 13:53:

You can put a socket 5 processor on a socket 7 but not vice versa. Your only option is Pentium Overdrive.

https://web.archive.org/web/20070504165927/ht … b/CS-001826.htm

Sorry for the necropost, but just wanted to clarify that this is incorrect. Your link specifically refers to Pentium MMX, which has a dual-plane / split-rail voltage, while OP asked if he can use higher speed NON-MMX CPUs.

The answer is yes, even a Pentium 200 will work on this board, however it will be underclocked to 90 or 100 MHz (if the board has the 66MHz FSB setting - mine does), due to the fixed 1.5 multiplier. I imagine it should be easy to force a 3x multi to get the full 200 MHz speed, by pulling down the BF1 pin (never tried it myself, though).

So, just for kicks, I modded one of my Pentium 200 CPUs (pulled BF1 to ground) and tested it on an Intel Plato. Works like a charm, have been playing with it for many hours now.

And since I did this, I also added a socket for the Dallas chip (and replaced the Dallas with the custom RTC module designed by Necroware) + replaced the DIN5 keyboard connector with PS/2 keyboard & PS/2 mouse connectors. Btw, if you do this, DO NOT add the 3 missing capacitors, just add the 3 x missing FBs near the mouse connector + missing 47 ohm resistor (R13D7) located near the N82C42PE keyboard controller.

For some reason, after adding those 3 x 1nF caps, both the keyboard and mouse stop working. Removing them restores keyboard & mouse functionality. Not sure if it's related to my specific board revision, or if it's something that happens with other revisions as well (there are some boards that come with the PS/2 connectors from the factory, and they obviously do work with those caps). Anyway, worth keeping in mind (+ the mouse works perfectly fine without them anyway).

Added some photos with the 200 MHz Pentium CPU mod & a few benchmark scores.

bloodem wrote on 2026-09-20, 05:10:

Sorry for the necropost, but just wanted to clarify that this is incorrect. Your link specifically refers to Pentium MMX, which has a dual-plane / split-rail voltage, while OP asked if he can use higher speed NON-MMX CPUs.

The answer is yes, even a Pentium 200 will work on this board, however it will be underclocked to 90 or 100 MHz (if the board has the 66MHz FSB setting - mine does), due to the fixed 1.5 multiplier. I imagine it should be easy to force a 3x multi to get the full 200 MHz speed, by pulling down the BF1 pin (never tried it myself, though).

You are right that plain Pentium 133-200 is the right voltage and fits, but Intel still disavows it.

What does 3.3V clocks mean?
The "additional supply current, etc." could vary from board to board as to whether Socket 5 already supplied it.
Anyway, I only have one Socket 5 board, and I use a Pentium 133 on it. Since the 120 is allowed, and the 133 is a newer process and uses less power, I don't see why it wasn't allowed.

jakethompson1 wrote on 2026-09-20, 20:44:

You are right that plain Pentium 133-200 is the right voltage and fits, but Intel still disavows it.

That's just Intel being... well, the Intel we all know. 😀

The board works great with the 200 MHz Pentium (flashed the latest BIOS: 1.00.16.AX1), didn't encounter any issues, it's quite stable.
I've installed Windows 95 OSR2, and it's surprisingly fast when paired with a Voodoo card. Many games are perfectly playable, including GLQuake, NFS2SE, Tomb Raider.

In terms of slowdown options, when using the keyboard shortcut for deturbo/turbo (CTRL + ALT + minus sign / CTRL + ALT + plus sign), you can get down to a ~ 386DX-20 (~ 10 FPS in 3DBench 1.0), while with the L1 cache turned off, you get a ~ 486DX-33 equivalent speed (~ 26 FPS in 3DBench 1.0c).