Retrocomputing question (Pentium 75mhz)

[MC.Morrado]

I am trying to research what socket an old Pentium 75 uses. What socket does it use and how much RAM does it max out at? What 1990's motherboard can I replace a Pentium 75 with something (either AMD or Intel) with a 233Mhz CPU or faster and upgrade to 64 megabytes of RAM?

 

Sorry if my question sounds dumb, I'm writing a book that takes place in 2005 and one there's a scene where one of my characters goes on a quest to find some RAM sticks and a CPU to get a bunker's computer controlled systems running again.

[mariushm]

They were released on Socket 5  and Socket 7 : https://www.cpu-world.com/CPUs/Pentium/Intel-Pentium 75 - A80502-75.html

 

You can filter them by release year, socket or manufacturing process here : https://www.cpu-world.com/CPUs/Pentium/TYPE-Desktop Pentium.html

 

If you get the Socket 7 version then you would probably be able to upgrade to Intel pentium mmx maybe up to 233 mhz ,  AMD K5, K6 maybe even K6-2 - the later cpus would require "Super Socket 7"

 

CPU World should have a list of processors compatible with Socket 7.

 

But it really depends on what voltages the motherboard can provide to the cpu socket and supported FSB frequency - back then cpus needed two voltages, one for the core and one for IO ... could have something like 3.3v for the core and 2.8v for IO .. some motherboards didn't support some combinations and you couldn't use some cpus with them.  Also some chipsets supported only up to 66 mhz fsb, but some chips ran on 75 mhz or even 100 mhz fsb

[Echothedolpin]

9 hours ago, MC.Morrado said:

I am trying to research what socket an old Pentium 75 uses. What socket does it use and how much RAM does it max out at? What 1990's motherboard can I replace a Pentium 75 with something (either AMD or Intel) with a 233Mhz CPU or faster and upgrade to 64 megabytes of RAM?

 

Sorry if my question sounds dumb, I'm writing a book that takes place in 2005 and one there's a scene where one of my characters goes on a quest to find some RAM sticks and a CPU to get a bunker's computer controlled systems running again.

64mb of ram would’ve been your typical max for a socket 7 system. It wasn’t entirely uncommon to have systems that could technically support more, but very rare to actually have been populated. Most common chipset of the era couldn’t cache over 64mb so you’d have a 15-20% performance penalty on that upper memory.

 

-edit- even 64mb would’ve been uncommon, typical system would’ve been purchased with probably 16-32 mb.