Depends on what do you want to do with it.
A lot of motherboards are good for an DX4.

hmm.. newest is good..
bios update, etc..

486 boards are getting hard and expensive to find these days.
I would recommend seeing what you can find 1st then confirm if it runs a DX4 120
You may never find the perfect board.

Just remember
PCI is nice but buggy.
VLB is cool but cards are $$$$
Very few use PS2 connections, less of a problem for the keyboard. More so for the mouse

As above, try and find one with a high CPU frequency support. Try and avoid the ones that have only ISA and 30-pin SIMM's since they are limiting and simply won't justify a faster CPU (though chances are them types of bords wouldn't support over 50Mhz anyway). But really, i'd take what you can get, I think mine has a 100Mhz 486 but I don't think it's running any faster than 50Mhz which is annoying. However the main thing is it supports 72-pin SIMM's and 3 VLB slots so atleast it's making use of whatever speed it's running at.

There are motherboards with good PCI support, like GA-486AM/S.
I have two 486 PCI motherboards that both support 133MHz AMD 5X86, PM me if you're interested or check my Amybay.

Take a look here:

Build 486's And They Will Come! Suggestions please!

and.. and what from ebay?

http://www.ebay.com/sch/Vintage-Parts-Accesso … rd&_dcat=175690

Not to sound terse.. but you just have to narrow your search a bit more..

http://www.ebay.com/sch/i.html?_odkw=Socket+3 … rd+486&_sacat=0

Then you can drill down and see what's decent. In my (recent) experience, boards that use a SiS or UMC chipset should be sought after. Again, it's a matter of preference... How much work do you want to make for yourself? Things like onboard IDE/Floppy controllers vs VLB controllers, coin battery vs barrel battery, PCI vs VLB bus types, flashable BIOS vs burned EPROM chips... All of these things are up to you.

http://www.ebay.com/sch/i.html?_trksid=p20506 … cat=0&_from=R40

tokyoracer wrote:

I think mine has a 100Mhz 486 but I don't think it's running any faster than 50Mhz which is annoying. However the main thing is it supports 72-pin SIMM's and 3 VLB slots so atleast it's making use of whatever speed it's running at.

What mainboard do you have, you can always mod the multiplier setting for the DX4 to run 3x instead of 2x.
VLB boards can run up to 50mhz and with multi 2 you end up 100mhz, that is great for a 100mhz 486 instead of 100mhz at 3x33

As for the better board a 120mhz 486.
Personally i would go vlb for 66-100mhz 486's and pci route for any faster system.
PCI cards also have more ram for graphic modes and easy to find and cheap.
also nice to put in some good scsi or ide card always helps.

JaNoZ wrote:

tokyoracer wrote:

I think mine has a 100Mhz 486 but I don't think it's running any faster than 50Mhz which is annoying. However the main thing is it supports 72-pin SIMM's and 3 VLB slots so atleast it's making use of whatever speed it's running at.

What mainboard do you have, you can always mod the multiplier setting for the DX4 to run 3x instead of 2x.
VLB boards can run up to 50mhz and with multi 2 you end up 100mhz, that is great for a 100mhz 486 instead of 100mhz at 3x33

IDK it's some random unbranded one. I'l see if I can PM you about it, if you could help me get it running upto speed that would be super. It has a metric sh*t-ton of jumper options that's all I do know!

ok, thanks for reply..

i can buy one from this.. which is good, best?

486IG-B-2-1 (BIOS 486)

PKM-0038S E2 (BIOS 486)

486IB-B-6-1 (BIOS 486DX)

MS4125 (BIOS 486DX)

MB-1433FA (BIOS 486DX)

V4P895GRN/SMT V1.0 (BIOS 486DX)

UMC 35-8333-01 (BIOS 586)

ELPINA V1.3A (BIOS 586)

PT2007 (BIOS 586)

VA-502 (BIOS 586)

? INTEL (BIOS 586)

I buy complete OEM desktops: best value for money.