Reply 40 of 126, by pyjujiop
I no longer recall exactly how far I tried to take the original C6, but I think it didn't go much past its rated frequency. The 233 MHz rated Winchip2 seemed to run OK at 262 MHz.
You had better luck than I did with one. About 12 years ago, I used one of these to upgrade a P5-75 MHz machine that belonged to a friend. It was one of the 233 MHz rated models, and it would run fine at 240 (60*4), or at 225 (75*3), but not at 266 (4*66) or at 263 (75*3.5). Your benchmarks suggest that the 240 MHz configuration is fastest, but I remember in my own real-world testing after I installed it, that the 225 MHz configuration was noticeably faster than stock 233 or running at 240.
Later on, I used a few more of them to upgrade P5-based 3.3v systems, and always used them at that setting if the board could handle it. They weren't very fast, but they were a pain-free way to speed up a P5.