No heat problems yet when the overdrive processor was sold with only a cooler glued to it.
A breakthrough was made with the Intel 486DX 100, based on Socket 3, which made the 100 MHz mark.
The 486 DX4 with 100 MHz was incredibly expensive in 1994 - it wasn't for students with summer jobs.
An alternative was offered by an AMD clone of the 486 DX processor, which ran at up to 133 MHz. The 120 MHz model was particularly popular.
The AMD 486 DX 120 was easy to overclock and even surpassed the first Pentium CPUs, while heralding the beginning of the AMD fan club.