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I think some of mine are OEM motherboards too, mostly they sadly are missing the VR part, so no other then 5 volt cpus are possible.
Can you tell me which OEM boards you have?

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@Robin4
didn't check the 486SLE bios yet? tsk tsk tsk , bad Robin4!! 🤣 Send me a dump! 🤣

I don't have as much stuff as I used to , only kept:

my old 440BX mobo, a Diamond Micronics C400
the 486SLE
an A-Open VI11 r1.1 486vlb mobo
an SNB-MOO8 286/16 mobo
a couple of these last and small 386DX/40 mobos that I am unsure of the model/make
and ofcourse 3x HOT591-P ss7 mobos (my favorite!)
and lastly a DFI P5BV3+ mvp3 ss7 mobo that is very similar to the HOT-591p's but has 1MB L2 cache instead of 512kb

moved to marvin

Here are my SS7 boards

FIC VA503+
Gigabyte GA5SMM
Gigabyte GA5AA
Chaintech CT 5AGM2
Soyo SY 5EHM
Epox EP MVP3GM
Epox EP MVP3G2
FIC PA 2013
Gigabyte GA 5AX
DFI K6XV3+
MSI MS 5169
Asus P5A
Aopen AX59 pro
TMC TI5VG+
TMC TI5VGF
TMC TI5VGA

Abit SA6R (i815EP) (Socket 370) #1 (2000)
Abit SA6R (i815EP) (Socket 370) #2 (2000)
Asus A8N32-SLI Deluxe NForce4 Socket 939 (2000)
MSI K8N Neo2 Platinum MS-7025 Ver. 1 (Nforce3) Socket 939
Asus CUSL2 Rev. 1.02 (2000)
Asus P2B-LS Rev. 1.03 Slot 1 (Intel 440BX) #1 (1998)
Asus P2B-LS Rev. 1.03 Slot 1 (Intel 440BX) #2 (1998)
Asus P5A Super 7 Rev. 1.06 (ALi Aladdin V) (1999)
Asus PCI I-486SP3G (Intel S82423TX) Rev. 1.8
Asus PVI-486SP3 (SiS 496-497) Rev. 1.2
Asus PVI-486SP3 (SiS 496-497) Rev. 1.22
Asus SP97-V Baby AT (SiS 5598) (1997)
Asus TX-97 Socket 7 (Intel 430TX) (1997)
Asus VL I-486SV2GX4 Rev. 2.0 (SiS 407-471)
Asus VL I-486SV2GX4 Rev. 2.1 (SiS 471-407)
BIOSTAR MB-8433UUD-A Socket 3 Rev. 3.1
FREE COMPUTER TECHNOLOGY 486VL-VII (SIS-85C471-2C4I8F21-00)
Gigabyte GA-5AX Super Socket 7 Rev. 5.2 (2000)
LS-486E Rev. C Baby AT (SiS 496-497)

I wouldn't know where to start.
I did try to make lists of what motherboards I have, but I kinda kept misplacing said lists 🤣

But last time I counted, I had slightly over 100 motherboards (not sure if all of them worked though, but most of them should work) of which around 1/3 are AT boards (most Socket 7 Pentium boards) and a lot of Slot 1 ATX boards.

I did post some pics of how I stored them (on shelves with usually 2 motherboards in each motherboard box and some motherboards stored in those kiwi boxes) in my attic. They are still there!

Edit: I found a few sheets of paper with a partial list of motherboards (I made lists by socket)
Apparently I should have the following boards:
ATX Socket or Super 7:
*GA-5AX rev 4.1
*P5A 1.03 (2x)
*P5A 1.04
*Soltek SL-56D5
*PA-2013 pcb 2.0
*MS-5169
*Epox EP-MVP3G2
*AOpen AX59PRO
*PWB-20630-001 rev B01 (SiS 5598)
*PWB-20630-001 rev E01 (SiS 5598)
*M5SIBADCXP512K (SiS 5598)
*TX97-XE
*TX97-X
*GA-5SMM

Slot 1
*20650-001 rev B01 (440EX)
*35-8929-00-01
*MS6147 ver 1.1 BX7
*Chaintech 6ATA2
*ABIT BE6-II
*AOpen AX6B (2x)
*SE440BX2 Intel
*Chaintech ??? BX board (8x)
*Intel Nightshade board

Socket 370
*TUSL2-C rev 1.04 (2x)
*TUSL2-C rev 1.03
*TUV4X 1.01 (3x)
*GA-60XT rev 1.0
*ECS P6VXAT rev 1.0 (yes, I actually have an ECS board 😜 )
*AOpen AX3S-U

*CUSL2 rev 1.02
*Chaintec 60JV2
*Intel D815DEEA
*Compaq P3B5A (has a black CPU socket)
*Compaq Top Tooling 240762-001 (Also black socket)
*GA-6VXE7+ rev 3.0

These boards are only the boards in storage, I didn't count the ones in existing systems 😜

286:

Octek FOX II -- In transit ATM

386:

Unichip UNI-386WB
QDI QD-U386DX -- Stuck in customs ATM 😠

486:

QDI V4P895GRN/SMT V1.1
VLB board i didn't care to ID yet
LuckyStar LS-486e REV:D
LuckyStar LS-486e REV:F
Zida Tomato Board 4DPS -- 2x
ATrend ATC-1425B

Socket 7:

QDI Titanium IB+ -- With modded BIOS for K6+ support, awesome board
A couple ones more that i really don't care about 🤣

Super Socket 7:

Aopen AX59Pro
Freetech/Flexus P5F103
Gigabyte GA-5AX rev 3 -- needs recapping
FIC PA-2013
IWill XA100 Plus
DFI K6XV3+
DFI K6XV3+ /66
Shuttle HOT-597 -- On transit ATM

Socket A:

Soltek SL-75KAV

I should get a XT motherboard. Always wanted to own one.