I have the same mobo and indeed it has an IBM 486SLC2 66mhz soldered next to the fpu - it's fast and the vlb slots work fine.
I cannot tell you the exact model of the cpu because there is a heatsink glued on it.
The mobo is the ALARIS LEOPARD 486SLC2 -> https://stason.org/TULARC/pc/motherboards/A/A … SLC2-REV-C.html

Wait ... 32 bit slots on a 386 ... SX ?! What's the point ? 🤣

fast graphics , this is not a 386sx board I'll post some benches later

edit:

DOOM benchmark gives 16 fps

BIOS stock settings and I used a S3 928 VLB vga. What is bad about this mobo is that it only has 4 simm slots so you need to hunt down 4MB modules to install more than 4mb...

Ah, "LEOPARD". Adding this word to the search phrase makes google not stupid again. So it is IBM mobo and the wire is factory job but all the photos have the CPU covered with a heatsink. I suppose that is why mine is missing the CPU - someone tried to get the heatsink off...

The only photos I found without heatsink are some russian one and the hosting expired so I'm looking at a post-stamp size miniature that doesn't tell me anything. But, funnily enough, I've also found Vogons posts about this mobo and it seems it more-or-less matches the TI 486SXLC performance? Well then I suddenly lost a lot of interest in it, I've already put an SXLC2 on a cache-less mobo in place of 386SX and at 50MHz it's pretty much the max of what can be had. Unless I could enable clock tripling or mod the clock gen on the IBM.

BTW I found that Trident 8900D, while not the fastest ISA card, is actually plenty capable in these SX systems. It's too bad it has some vertical banding (it's not very bad like on Realteks) but I got it cheap. So considering the SX would need 2 memory transactions to write to VLB slot anyway, I don't think it's that much of an improvement.

EDIT: My TI486SXLC2 at 50MHz (25MHz bus):

1 CACHECHK V7 11/23/98  Copyright (c) 1995-98 by Ray Van Tassle. (-h for help)
2 CMOS reports: conv_mem= 640K, ext_mem= 3,200K, Total RAM= 3,840K
3 486 Clocked at 52.7 MHz
4 Reading from memory.  
5 MegaByte#:      --------- Memory Access Block sizes (KB)-----
6       1    2    4    8   16   32   64  128  256  512 1024 2048 4096 <-- KB
7 0:   27   26   26   27   74   74   74   74   74   74   --   --   --    us/KB
8 1:   27   26   26   27   74   74   74   74   74   74   74   74   --    us/KB
9 2  3  4  <--- same as above.
10
11 Extra tests----
12 Wrt   42   42   42   42   42   43   42   42   42   42   42   42   --<-Writing
13 Reading at different byte offsets, at megabyte #1.  Byte offset of...
14  0=  26   27   26   28   75   74   74   74   74   74   74   74   --    us/KB
15  1=  32   32   32   34  111  111  111  111  111  111  111  111   --    us/KB
16  2=  32   32   32   34   90   90   90   90   90   90   90   90   --    us/KB
17  3=  32   32   32   34  113  111  111  111  111  111  111  111   --    us/KB
18  4=  26   27   26   28   75   74   74   74   74   74   74   74   --    us/KB
19  8=  26   26   26   28   75   74   75   74   74   74   74   74   --    us/KB
20 12=  26   26   26   28   74   74   74   74   74   74   74   74   --    us/KB
21 This machine seems to have one cache!? [reading]
22    !! cache is    8KB--  40.5 MB/s  25.9 ns/byte (273%)         
23 >>>> If you think you do have L2 cache, you might have FAKE CACHE chips! <<<<
24    5.2 clks
25    Main memory speed --  14.8 MB/s  70.7 ns/byte (100%) [reading]  14.2 clks
26    Effective RAM access time (read ) is 282ns (a RAM bank is 4 bytes wide). 
27    Effective RAM access time (write) is 161ns (a RAM bank is 4 bytes wide). 
28    486 Clocked at 52.7 MHz.  Cache ENABLED.
29 Options: -t0 -z

And some other benches:

1** (RAM 4MB, 0 WS; ISA 0 WS)
2JP1: 1-2
3
4* NSSI (/SAFE):
520113 Dhry/s (fi 20188, 16-bit code)
63280 kWhet/s (fi 3292, real mode)
7
8* SI 8.0:
973.8
10
11* Speedsys 4.78:
1222.24
13
14-- Trident TVGA8900D (1024k x32):
15
16* TOPBENCH:
17118
18
19* Speedsys 4.78 VESA mem:
203445 kB/s
21
22* 3DBench (1.0, 1.0c):
2322.7, 22.3
24
25* PC Player Benchmark (320, 640):
265.7, 2.2
27
28* Landmark 6.00:
29203 MHz AT, N/A, 4147.85 chr/ms
30
31* Doom (low, high):
322134/2182, 2134/7267
33
34* FractBench:
35Fixed: 0m:07s.19
36Float: N/A
37
38* Chris's 3D Benchmark (320, 640):
39N/A, N/A

the performance boost is significant, your DOOM benchmark is 10.2fps - the leopard one on my test scored 15.99
so that's +60% , not small keeping in mind this is still built around the 386sx limitations. I assume most of the speed bump comes from cache - vlb slot just lets you use better graphics cards without having to hunt the better ISA ones.
Certainly a more useful board than some upgraded cacheless 386sx one IMHO - provided it still had the cpu 🤣 🤣 🤣

Yeah I know it's not really a 386SX, but a 32 bit bus with a CPU having only a 16 bit bus sounds kinda silly ^^

I wonder how that works (probably some weird things happening there, like with vlb pentium board's)

These benchmarks are quite interesting though as I plan to upgrade my 386SX25 to the Ti486SXLC2 and I've never seen benchmarks of it before. The speed looks very nice, it looks quite close to the 486DX2 despite the slower bus !

to my knowledge these were still budget boards, not meant to compete with fully fledged 486 systems so they made sense back then for that kind of market
Now they are just a curio for collectors or something 🤣

keropi wrote:

the performance boost is significant, your DOOM benchmark is 10.2fps - the leopard one on my test scored 15.99

Eh, yes, but that's down to my ISA VGA and the fact that Doom just loves 486 cache so 16kB of L1 is probably making more difference than the extra L2.
For example, another mobo I modded to accept 486SXL this time, so true 32-bit but still with ISA and on 40MHz clock:

1486SXL 40MHz + Cyrix CX-83D87-40-GP FASMATH
2
3** (RAM 8 MB, 1/1 WS, cache W-Back 0/0 WS Burst Enabled, BARB)
4
5* NSSI (/SAFE):
618619 Dhry/s (fi 18660, 16-bit code) - pretty much matches i486DX-33
75586 kWhet/s (fi 5603, real mode)
8
9* SI 8.0:
1065.7
11
12* Speedsys 4.78:
1310.25
14   
15-- Trident TVGA8900D (1024k x32):
16
17* TOPBENCH:
18126
19
20* Speedsys 4.78 VESA mem:
214851 kB/s
22
23* 3DBench (1.0, 1.0c):
2423.2, 22.8
25
26* PC Player Benchmark (320, 640):
276.4, 2.4
28
29* Landmark 6.00:
30168 MHz AT, 165 MHz 80287, 5146.81 chr/ms
31
32* Doom (low, high):
332134/1768, 2134/6367
34
35* FractBench:
36Fixed: 0m:08s.84
37Float: 0m:32s.35
38
39* Chris's 3D Benchmark (320, 640):
4019.6 (11.8 fps), 6.1 (3.6 fps)

Same VGA card, slower CPU but way faster bus and I still get an improvement in Doom. And I can probably make it better still by jury-rigging a proper FLUSH# circuit rather than use BARB option - the whole purpose of that mod, BTW. Still haven't got time to actually do it.
And here's a true 486 (U5S actually) at 40MHz in a lousy OPTi495SLC with very loose timings:

1U5S 40MHz
2
3** (safe: RAM 8 MB, 0/0 WS, cache 3-2-2-2, 1 WS)
4
5* NSSI:
626524 Dhry/s (fi 26750, 16-bit code) - in the middle between Am486Dx-40 and i486DX2-66
73380 kWhet/s (fi 3392, real mode)
8
9* SI 8.0:
10111.8
11
12* Speedsys 4.78:
1321.12
14
15-- Cirrus CL-GD5424 (VLB):
16
17* TOPBENCH:
18190
19
20* Speedsys 4.78 VESA mem:
218883 kB/s
22
23* 3DBench (1.0, 1.0c):
2438.4, 37.7
25
26* PC Player Benchmark (320, 640):
277.3, 2.8
28
29* Landmark 6.00:
30188 MHz AT, N/A, 9187.29 chr/ms
31
32* Doom (low, high):
332134/1331, 2134/3862
34
35* FractBench:
36Fixed: 0m:09s.44
37Float: N/A
38
39* Chris's 3D Benchmark (320, 640):
40N/A, N/A

It beats the 66MHz IBM Doom score. All thanks to 32-bit burst transfers on VLB. And that is way cheaper and easier to build so while I'm still intrigued by that mobo, I've just lost my drive to fix it. It's going to be shelved.

Deksor wrote:

These benchmarks are quite interesting though as I plan to upgrade my 386SX25 to the Ti486SXLC2 and I've never seen benchmarks of it before. The speed looks very nice, it looks quite close to the 486DX2 despite the slower bus !

Well I did that by putting a 3V3 chip with 5V tolerant I/O on a standard PC mobo. I did add a heatsink and I'm still below absolute max ratings for the TI chip but I can't guarantee it won't die prematurely. I don't mind though, it's only for testing. Here's a the original 386SX-33MHz scores with both Realtek and Trident to compare:

1386SX 33MHz
2
3** (RAM 4MB, 0 WS)
4
5* NSSI:
66692 Dhry/s (fi 6718, 16-bit code)
7591 kWhet/s (fi 593, real mode)
8
9* SI 8.0:
1025.4
11
12* Speedsys 4.78:
136.45
14
15-- Realtek RTG3105 (512k):
16
17* TOPBENCH:
1843
19
20* Speedsys 4.78 VESA mem:
21833 kB/s
22
23* 3DBench (1.0, 1.0c):
247.8, 7.8
25
26* PC Player Benchmark (320, 640):
271.9, N/A
28
29* Landmark 6.00:
3047 MHz AT, N/A, 1100.83 chr/ms
31
32* Doom (low, high):
332134/5194, N/A
34
35* FractBench:
36Fixed: 0m:29s.66
37Float: N/A
38
39* Chris's 3D Benchmark (320, 640):
40N/A, N/A
41
42-- Trident TVGA8900D (1024k x32):
43
44* TOPBENCH:
4568
46
47* Speedsys 4.78 VESA mem:
483448 kB/s
49
50* 3DBench (1.0, 1.0c):
5110.4, 10.3
52
53* PC Player Benchmark (320, 640):
542.1, 0.9
55
56* Landmark 6.00:
5747 MHz AT, N/A, 4147.85 chr/ms
58
59* Doom (low, high):
602134/4648, N/A

61
62* FractBench:
63Fixed: 0m:29s.55
64Float: N/A
65
66* Chris's 3D Benchmark (320, 640):
67N/A, N/A

https://www.ultimateretro.net/en/motherboards/2943

Haha, nice, the poor CPU-less mobo got immortalized. I wish I had a better photo to offer but alas it became a parts donor for other motherboards. So now it's even less complete, but at least didn't go to trash.

I have the little brother (or sister) of this motherboard, the IBM Opal LX (no VLB slots and no L2 cache). It is however complete and functioning. I see that it's not in the UltimateRetro database so I'll try to add it to that soon. I have the original manual too.

(and no don't worry - what you see next to the keyboard connector isn't a barrel battery; it's been replaced by a bank of supercaps)

Awesome !

If you're not a fan of discord, you can upload the files in this thread [CLOSED] The Retro Web submissions thread: suggest edits and/or add new boards here

Edit : actually it looks identical to this one https://www.ultimateretro.net/en/motherboards/442
strange that they haven't the same name. Anyways, photos and manual scans are still welcome (it might help to figure out why they're named differently as well. Who knows ?)

There is a discord server?

Yes, checkout the footer of ultimateretro 😀 (also I've edited my previous message)

Yes, that is it. I can dump the bios and scan the manual too. Mine was sold originally under the IBM brand, but was made by Alaris.