Reply 20 of 31, by amadeus777999
There's one thing about 256K PPro's. While the core is 350nm indeed, the cache die is still 600nm. So it may be a limiting factor. Many 256K PPro's don't even POST at 266MHz, though 1M chips don't do it either. The 512K PPro comes with a single 350nm cache die. It takes two of these for the 1M chip with a lot of power consumption. I have measured 11.7A @ 233MHz on the VRM while running Memtest.
I have recently overclocked one 200MHz/256K to 266MHz at 3.4V. It was unstable in benchmarks and couldn't compile a damn thing, so I modded it by soldering 10 1.0uF capacitors on the top.
It's fine now, passes all benchmarks and can compile a Linux kernel. What's really interesting, this is an early SY013 with the A0 core revision and A cache revision. It isn't supposed to do 266MHz, but it does.
That's an awesome mod!
Only PPro machine that I saw in real life was back in '99 at a friends house - 24" CRT included.
The machine was a few years old and he must have spent a fortune on it. He wanted to sell it to me for a few hundred and I refused as I had no use for it.