Horun wrote on 2020-05-21, 03:18:
[...]
🤣 I have a bag full of 5v DIMMS so they are a thing, mostly from late 486 and P60/p66 boards from early Dell, Compaq and some others. Sorta like those AST 64pin simms I have that some claim were never part of anything PC but yes they were 😁
The 5v DIMMS will fit some 3.3volt slots but most (like the SDRAM world) are keyed to not fit by being off a few millimeters. I have two 486 boards that use 5V DIMMS not the 3.3v ones.
OK, should have qualified that - "desktop PC", in workstation/server world buffered 5V DIMMs were a thing, but they were keyed differently. A DIMM slot designed to take SDRAM, as supported by i430TX won't physically accept 5V DIMMs, for both keys for that matter (buffered vs unbuffered, 3.3V vs 5V)
Added: from Anandtech:
"Jul 4, 2001
While working on a system for a friends son recently, I noticed jumpers on the mobo for eith […]
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Added: from Anandtech:
"Jul 4, 2001
While working on a system for a friends son recently, I noticed jumpers on the mobo for either 3.3V or 5V DIMM modules.
This is an old PcChips motherboard. It took a good bit of seaching, but I was finally able to identify the model number of the board and download the manual for it.
What was initially concerning me is that someone had installed both simms and dimms. The manual shows that it is supported, so I left it as was.
Thanks for the help."
Yes, that jumper on the M571... very odd as the keying in the slot is 3.3V only, so a DIMM supporting 5V wouldn't fit.