The Cyrix 6x86MX PR200 was Cyrix's answer to the Intel Pentium 200 (and MMX). Generally it ran quite well although it ran slightly hotter than the Pentium. For Office use the 6x86 was a fine choice but for gamers Cyrix left the competition when games like Quake arrived. The floating-point unit (FPU)... > Read more

Cyrix's M2 was, on paper, quite an improvement over the M1R that the IBM 6x86 P200+ used. This is because the M2 is made on 350nm instead of 650nm and thus uses a lower core voltage, which causes much less heat generation. Despite this, the increased L1 cache (to 64KB instead of 16KB) results in the... > Read more

Similar to the Cyrix 6x86MX PR200 but then a tad faster. This one clocks at 187MHz using a 75MHz front-side-bus so it's only 21MHz faster than the PR200 mentioned earlier. Usually the increased front-side-bus will compensate for the slightly decreased clock ... > Read more

In early 1998 these CPUs were fine if you weren't into gaming or using floating-point intensive programs. Straight up competitor with the Pentium MMX but to make things confusing Cyrix/IBM also threw their own CPUs in the ring: the PR233 was available in both 66MHz FSB and 75MHz FSB versions. Usuall... > Read more

IBM's fastest 6x86MX is the PR333 at 250MHz using a 83MHz FSB. They are based on the Cyrix MII core but the IBM 6x86MX PR333 seems to be ever so slightly faster than the Cyrix MII 333GP in the benchmarks.

Cyrix did release faster versions like the 366GP, 400GP and 433GP but since they had problem... > Read more

Almost identical to thisIBM 6x86MX PR300 except for the clock frequency/FSB ratio. One runs at 233MHz/66FSB and the other at 225MHz/75FSB.

Since the IBM 6x86MX is essentially a Cyrix MII (same core, different name) they should perform equal to the Cyrix M... > Read more

Technically this is a Cyrix CPU but IBM sold them under their name as well. I like the dark looking heat spreader that just sits on top of the 'die' (the core). You can look under the heat spreader and actually see the 'die' along with some SMD chips. Somehow that reminds me a lot of the AMD K6-2 (w... > Read more