Is there a BIOS setting? Maybe a jumper?

Are Pentium mobos Turbo-able even?
This guy has a similar PC to yours and couldn't figure out how to do it.

https://ancientelectronics.wordpress.com/2014 … ay-2000-p5-120/

I'd say wait to get into DOS, then hold Ctrl+Alt then start pressing each key on the keyboard (except Del, hehe). You might get lucky and discover the right toggle key... if there ever was one.

Another thing to do probably even before trying, is to trace the Turbo LED connector. If it has a dedicated header on the mobo or if it's branched off some generic LED connector (maybe even PWR LED). In which case it would prove to be a dud Turbo LED.

Chances are that the option isn't there (no turbo header on the motherboard or a shortcut on the keyboard). This is different to just having an LED connected to the motherboard.

Turbo switches were more common up to the 486 era but, but beginning with the Pentium era, it started to become obsolete. There were some Pentium boards with a functional turbo header (I have one) but, they aren't that common.

Your best option would be to either go into the BIOS to disable L1 or L2 cache or use a utility like Setmul.

Its a Intel OEM motherboard inside?
So "CTRL ALT +" and "CTRL ALT -" combos under DOS and "TURBO MODE" on/off inside BIOS (as permanent variants)

Can confirm CTRL ALT + numpad + and - turns it on and off... perfect thank you everyone.

Now I'm curious how slow does it get with turbo off 😀

wbahnassi wrote on 2022-10-03, 15:07:

Now I'm curious how slow does it get with turbo off 😀

Probably as a fast 386.

Is that a Gateway 2000 "Family Computer"? I just picked up a P5-75 a few weeks back. There is an option in the Bios to turn off the turbo, but you really wanna keep it on if you intend to use it as a P5-100.