I have a Pentium 133, no MMX computer and my friend said he somehow got a hold of a 166MHz chip, so I installed the new one. The problem is that upon startup, while some elements are different (like the beep sound), the indicated speed is still 133MHz. I was curious so I used SiSoft Sandra to benchmark and behold it performed less than a 166 and more than a 120. For the most part, I got no considerable gain I should have received from the chip upgrade. The only thing new I noticed is that it had MMX support.
My friend believes it is a 166, but maybe there's a jumper that is holding back the performance? Do I need to change something in the BIOS settings? SiSoft Sandra indicates that:
Processor: Intel Pentium MMX @ 133MHz
Model Information: P55C Pentium MMX 166-233 2.8V
... so supposedly the model should perform at 166? At first I thought my friend was just dumb, but I'm not so sure anymore. Should you need more info, I could send a whole report from Sandra.