Retrocomputing topic for a Pentium 75 MHz processor
Retrocomputing topic for a Pentium 75 MHz processor
I'm looking into the socket type for an old Pentium 75, its maximum RAM capacity, and compatible motherboards from the 1990s that could replace it with a faster CPU or upgrade to 64MB RAM. This info should help your 2005 book scene where a character restores a bunker's systems.
They were launched on Socket 5 and Socket 7: https://www.cpu-world.com/CPUs/Pentium/Intel-Pentium 75 - A80502-75.html You can sort by release year, socket type or manufacturing process here: https://www.cpu-world.com/CPUs/Pentium/TYPE-Desktop Pentium.html If you find the Socket 7 model then upgrading to Intel Pentium MMX might be possible, potentially reaching around 233 MHz, while AMD K5 and K6 could work possibly even K6-2 – newer models would need "Super Socket 7". CPU World maintains a list of processors that fit Socket 7. However, it really depends on the voltage options the motherboard offers for the CPU socket and the supported FSB speed – at the time CPUs needed two voltages, one for the core and one for IO... maybe around 3.3V for the core and 2.8V for IO. Some boards couldn't handle certain combinations, and not all chipsets supported speeds up to 66 MHz FSB, while others ran smoothly at 75 or even 100 MHz FSB.
64mb of RAM was usually the upper limit for a Socket 7 setup. While it wasn’t unheard of to find machines that could handle more, such high memory levels were rare. Most chipsets from that time didn’t support caching beyond 64mb, which meant you’d face about a 15-20% slowdown when using that extra space. -edit- Even 64mb was not typical; most systems came with around 16-32mb.