Another classic; the Pentium MMX at 166MHz. The Pentium MMX was made using a 280nm process instead of 350nm for the Pentium 133, 166 and 200. Because of this it runs cooler and with less voltage. This CPU did not only have MMX technology (which are a set of instructions) but also has twice the L1-cache. The bigger L1-cache is the main performance boost- not MMX! Especially at the time the Pentium MMX was released as application that used MMX could be counted on one hand.

See this Wiki page for more details on MMX.

The Pentium MMX uses a split-voltage design meaning it talks to the outside with 3,3V while internally it works at 2,8V. This causes incompatibility with older motherboards so the Pentium MMX can't run (by specs) in older motherboards.
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Same as this Pentium MMX 166 except that this version comes with an attached heatsink/fan solution. I also noticed that this CPU is multiplier unlocked so it can easily be set on 200MHz by raising the multiplier to 3x. Mutliplier locks prevent people from relabeling a CPU to a faster model. For example: take a Pentium MMX 166 and label it as Pentium MMX 200: the one who buys it, at the price of a MMX200, configures it at 200MHz and actually over clocks his/her chip. This can cause instability and Intel loses sales. As far as I know Intel began with the multiplier locks on some of the Pentium 133 CPU's but didn't lock all CPU's at once so there are newer unlocked models available. > Read more

A lot like this PPGA Pentium MMX 166 but than in ceramic form. > Read more

Same as this Pentium MMX 166 but then 33MHz faster. The 200MHz model became quite popular after some price drops. Intel's competitors couldn't match the Pentium in terms of FPU performance leaving game enthusiasts no other choice then buying the Pentium CPU. The 233MHz model was quite a bit more expensive and therefor less popular.

My CPU uses the PPGA (Plastic) packaging but I've also seen this CPU, with the same sSpec number, in CPGA (Ceramic) packaging . > Read more

This one is like the 166MHz and 200MHz Pentium MMX processor but running at a whopping 233MHz! At the time this was generally the fastest socket 7 processor money could buy.

In my benchmarks it's breaking the 100 FPS barrier in both MDK and Doom. Quake seems to get a nice 33MHz bump over the 200MHz part (it scales fine). > Read more

The fastest Pentium MMX on socket 7 and the second fastest Pentium MMX in the world. The Pentium MMX originally went up to 233MHz but mobile versions were also available in 266MHz and 300MHz versions. The 266MHz version was also made for socket 7 so it can run in very few desktop systems.

Intel used their 250nm manufacturing process to create the 266MHz 'Tillamook'. The original Pentium MMX is made on the 350nm process and thus this 'Tillamook' version can overclock a lot better. It's not difficult to get it up to 350MHz or higher . The only problem I encountered is compatibility. It does work on several of my motherboards but in all of them the system crashes after the P.O.S.T. Some motherboards do show the table with system information but don't show L2 cache. I suspect the motherboards can't handle the CPU properly and somehow mess up the L2 cache.

Because my motherboards don't run the 'Tillamook' correctly I don't have benchmarks.

I did not include a picture of the front of the CPU because it is exactly the same as the previous PPGA Pentium MMX CPU's. It looks just like the one shown here . > Read more