The classic Pentium at 60MHz. This is the first Pentium-class CPU along with it's 66MHz counterpart.
Compared to a 486 the Pentium had several improvements including a superscalar architecture, 64-bit external databus and a faster Floating Point Unit (FPU). The superscalar architecture allows the Pentium to complete more than one instruction per clock cycle and the 64-bit databus allowed faster communication with the internal RAM. Due to the bigger bus SIMM's always have to be installed in pairs. One SIMM is 32-bit.
The FPU used pipelining (see this 486 that explains pipelining) to make it faster. The first Pentium CPU's (60~100MHz) had a problem in the FPU that resulted incorrect but predictable results. My Pentium 60 (as seen on the photo) also has the bug. The bug was detected in 1994 and eliminated in the end of 1994 meaning that only the oldest Pentium CPU's have the bug. Intel started a program to replace the bugged CPU's.
When running the Pentium 60 I noticed that both the chipset and the Pentium processor ran quite hot. The Pentium CPU needs 5V for operation which is a lot more compared to the newer Pentiums (P54; from 75MHz). Besides that everything ran normal.
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