Intel VS440FX with 128 MB or 3.3 V SIMMs \ VOGONS

Intel VS440FX with 128 MB or 3.3 V SIMMs

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First post, by feipoa

Posted on 2019-07-26, 19:11

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Has anyone tried 128 MB SIMMs in an Intel VS440FX motherboard? What about 3.3 V SIMMs? The manually specifically calls for up to 64 MB SIMMs, but was wondering if 128 MB would work. Also, the manual does not specifically mention 3.3 V SIMMs, so I assume it is 5 V only? Seems some Pentium Pro boards could take 5 V or 3.3 V SIMMs.

Board manual is here: http://www.elhvb.com/mobokive/Archive/Intel/V … FX_28181203.pdf

Last edited by feipoa on 2019-07-26, 23:41. Edited 1 time in total.

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Reply 1 of 7, by rmay635703

Posted on 2019-07-26, 19:54

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Usually works but only get a fraction of the capacity

Reply 2 of 7, by havli

Posted on 2019-07-26, 20:05

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I have no idea about the voltage, but 128 MB SIMMs actually might work at full capacity. i440FX supports up to 1 GB of RAM and it really works (I have 4x 256 MB EDO DIMM in 440FX board). So 2x 128 or 4x 128 should be easy.

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Reply 3 of 7, by The Serpent Rider

Posted on 2019-07-27, 01:20

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I don't think any "common" 440FX board knows how to deal with 3.3 SIMMs and manuals don't mention it either. In many cases SIMM slots are placed near AT/ATX connector with very obvious direct 5v feed from PSU. Does regular EDO DIMM even work at 3.3v?
Also I doubt that 440FX can work with buffered 128mb/256mb SIMMs or any sticks from HP servers. I tried some 128mb HP sticks, but they didn't boot.

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Reply 4 of 7, by alvaro84

Posted on 2019-07-27, 03:49

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Do 3.3V SIMMs have different keying?

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Reply 5 of 7, by kixs

Posted on 2019-07-27, 06:41

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alvaro84 wrote:
Do 3.3V SIMMs have different keying?

No. It's the same.

I've used 128MB 3.3V memory in Amiga Blizzard 1230IV card that supposedly only supports 5V. It's works just fine so far... 🤣

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Reply 6 of 7, by The Serpent Rider

Posted on 2019-07-27, 10:22

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So it's just 5v compatible.

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Reply 7 of 7, by kixs

Posted on 2019-07-27, 12:01

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The Serpent Rider wrote:
So it's just 5v compatible.

I hope so 😊

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