I know this topic has been discussed here before, but I just wanted to relay my experience so far. I recently put together a retro system with this motherboard and used a Pentium MMX 233Mhz. I set the motherboard multiplier to 1.5x as Pentium MMX CPUs remap this 3.5x to get the full 233Mhz. (Thanks to shamino on this board for reminding about the multiplier remapping). I used a Startech all copper heatsink/cooler:

https://www.amazon.com/StarTech-60x10mm-Socke … 94064760&sr=8-8

I have had no issues even though the Pentium MMX CPU is being overvolted from 2.8V to 3.3V as this board does not support the 2.8V. I guess time will tell if the CPU lasts over the long haul. I just really like this motherboard being one of the first ATX motherboards from Intel.