64mb+ simms were extraordinarily rare and $1000+ a stick when these systems were released
many times they had support before the Simms were being sold meaning it can be hit or miss

Usually 128mb Simms aren’t fully standard, so if your board supports odd memory types you might be good but no way to know without testing it.

I had one system that supported k6-2 chips with a bios update but after that update 128mb sticks became unstable

Back to the old bios and the larger memory worked fine.

Well, the 430HX chipset supports up to 512 MB if I'm not mistaken. Has anyone seen a motherboard containing a 430HX chipset which contained eight SIMM sockets?

feipoa wrote:

Well, the 430HX chipset supports up to 512 MB if I'm not mistaken. Has anyone seen a motherboard containing a 430HX chipset which contained eight SIMM sockets?

For what it’s worth Mine had 6 72 pin Simms , I’ve also owned an HX with 5v Dimm sockets
(for edo dimms only, I was a dumb teen at the time and tried sdram, which didn’t work, thankfully no damage)

Now it does appear yours supports 128mb Simms

This guy using your mobo had 512mb of ecc registered fpm, so yep does work.

My oldskool gaming Peecee...

Good Luck

Ahh, nice find! What about this chipset supporting 3.3V EDO and FPM modules rather than the standard 5V pieces?

3.3 volt edo dimms are rare sorta like 5 volt sdram

So I doubt it’s an issue

I don't think they are all that rare. They appear rare because sellers don't bother to look up the specs and assume they are 5 V. I have ended up with a 256 MB set of 3.3 V FPM and a 256 MB set of 3.3 V EDO. They were advertised as 5 V. Does the chipset support 3.3 V SIMMs?

Chipset is irrelevant the board would list a voltage setting if it supports it

I doubt it and I have run 3.3 volt memory at 5 Volts for years.

http://www.tsukumo.co.jp/20thanniversary/comp … ASUS_manual.pdf

There is no such thing as a 3.3 volt simm and your board only works with Simms

In the transition between simms and dimms, both formats had both voltages.

There are 5v dimms, I own some
There are 3.3v Simms, I own some.

But to answer the issue, if its a simm, Its highly likely to be 5v, conversely dimms are highly likely to be 3.3v.

If the motherboard supports different voltages, it will have jumpers to select the proper voltage. I know, because I have several motherboards that take simms and are selectable between 3.3 and 5v.

luckybob wrote:

In the transition between simms and dimms, both formats had both voltages. […]
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In the transition between simms and dimms, both formats had both voltages.

There are 5v dimms, I own some
There are 3.3v Simms, I own some.

But to answer the issue, if its a simm, Its highly likely to be 5v, conversely dimms are highly likely to be 3.3v.

If the motherboard supports different voltages, it will have jumpers to select the proper voltage. I know, because I have several motherboards that take simms and are selectable between 3.3 and 5v.

That is pretty much what I thought the situation was.

I was also wondering about the chipset. Like how some chipsets seem to require mixed-mode SRAM, e.g. the SRAM runs at 5 V, but outputs at 3.3 V. For motherboards which take, both, 3.3 V or 5.0 V SIMMs, I assume it is the motherboard which adds, say, a double-series-diode implementation to drop 5 V to 3.3 V (selectable via a jumper, or automatic), or is it that the chipset's northbridge has a wide range of voltage acceptance for I/O? Is there any analogous mixed-mode FPM or EDO IC's?

well, specifically, the board I have at hand uses 7x 74F244's between the chipset and memory. I would wager they are doing the heavy lifting here.

Quality boards use buffer IC's, but I've seen some PC Chips boards which use a resistor and call it done.

Tested 128 MB FPM SIMMS and they worked.