Quick question: Has anyone tested the CPU fan header to see if the tach pin works as intended?

Some more background: I picked up a Dimension 4100 a while back and the processor ended up being significantly slower than I thought it would be. I'm thinking about upgrading the processor and figure I'd upgrade the heatsink and case cooling situation a bit in the process. The stock setup is a single case fan with a plastic shroud that sucks air up and through the CPU heatsink. The fan sounds unhappy at times and the shroud tends to rattle/buzz, which is less than ideal. The fan is plugged in to the CPU fan header on the motherboard, but it's a very "Dell" implementation where it's a 2 wire plug in a 3 pin socket, and the fan has a built-in thermistor for fan speed control. No CPU temperatures are reported in the BIOS or in hardware monitoring programs, so I'm not even sure if the motherboard is set up to read CPU temperatures, or if the appropriate RPM signal is getting passed along the third (currently unused) CPU fan header pin.

Has anyone tested a standard 3 pin CPU heatsink fan on the CPU fan header on a Dimension 4100 to see if it works as intended?

For reference, someone on another forum pointed out that the board is detailed on theretroweb here: https://theretroweb.com/motherboards/s/intel- … easton-dell-oem (but I didn't see any info on the fan header there).