I like the Jaguar V because the chipset is "special" with the integrated 8kb cache. At least it stands out because it's different than the rest

The Symphony is a hybrid chipset? That certainly limits my interest by 85%.

Yeah, the Octek Jag is a good package.
It also has the fastest warm reset ever - ~1 second until back to DOS prompt.

Yeah Haydn is a hybrid.
To me the "purity" of some chipset does not matter much.
I look more at the whole package - Socket 2/3, VLB, 72-pin SIMMs are things that give me a pause.
Is that a beefy 386 board or watered down 486 one ?

If hybrids don't matter, what did you think about the UMC 481/482?

From my personal brain memory, it seemed like late era non-hybrid 386 boards have faster memory throughput compared to the hybrids.

481/482 is ok.
same for 492.
the best implementation of 48# i have seen is Forex FX-3000.
clock to clock slower than m321, Octek Jaguar V and way behind DTK-PEM-4036Y.

maybe i should post some links here, so my notes dont look too baseless.

Given the title of this thread, I think that would be a swell idea!

I also thought the 481/482 was pretty good.

EDIT:
Any chance you have results with

this particular Symphony board?

Another DTK PKM board - yum !
These are rare as chicken milk.
So you have this guy and didn't try it yet ?
I will be very curious to hear where it takes you.
I sense AMI Baby Screamer is getting tense. 😀

---

Ok couple of links about the discussed motherboards:
Forex FX-3000 UMC 481/482
Micronics TK-82C491/386-4N-D02C UMC 492
Octek Jaguar V rev.1.3 MX 305/306
DTK-PEM-4036Y Symphony Haydn <- !
PC-Chips M321 rev.2.3 Scroll down there (sorry). Later revisions get weird because of cost cutting. 2.3 to 2.5 are the better ones.

And the two very hybrid boards from Alaris/IBM:
Leopard rev. C
Cougar

Yeah, I've been sitting on that board for years now. I do have a PCI socket 3 system setup around a DTK PKM-something.

I would recommend posting their respective speedsys screenshots here. I don't think most users will click link after link.

Can share them at some point later.
Was thinking to put all 386 benchmarked metrics (including the ones you shared) in one chart so it is easy to follow.

DTK PKM-5031Y This one ?
Easily the fastest early 486 ISA-only mobo.

An ISA-only 486 just doesn't do it for me. My DTK 486 is socket 3 w/PCI.

Looks like your PEM-4036 has a lot smaller PCB foot print compared to my PEM-4030Y, thus I bet the results at 50 MHz will be a lot more favourable to the 4036. Also, I'm not sure if the RTC module on mine is compatible with the 12887. Mine has some RTC module that I haven't come across before.

I see about the DTK board.

Haven't seen this one.
Online search reveals single Atari related thread on some forums.
It should be compatible with 12887.

The PCI 486s from DTK actually aren't real DTK boards. They outsourced the job to Gemlight. I think the same applies to half of their VLB boards as well.
DTK was kind of a cool company when they designed and built their own hardware...except for their crappy BIOSes.
I'd love one of those DTK 386 boards with the Haydn chipset. I came from a DTK town, so I have a special attachment to DTK.
Their pre-assembled machines were pretty sweet too. They only used the finest quality Enlight chassis with matching power supplies. Their keyboards were often pretty good (usually Maxiswitch), and it seems they liked to bundle the Sony Trinitron with their higher end offerings.

Never saw DTK assembled PCs.
Do you have a reference ?

You can definitely see the ads and reviews in old copies of PC Magazine. One of the more popular models was called the "Grafika".

In this build I'm using a DRx2 so this might not count as a "real 386", but I hope it's interesting to see anyways. My goal with this project is see how much I could have upgraded my first PC that I got in '92 without swapping the mainboard.

CPU: Cyrix DRx2 33/66 with green heatsink
FPU: none
Motherboard: FIC LEO 386-SC-HG (like thishttps://www.ultimateretro.net/de/motherboards/5265)
Chipset: Symphony Labs Haydn
Cache: 128kB 15ns (tag 12 ns)
BIOS: Swapped the Amibios with a MR BIOS I found for another Haydn board
Memory: 4x4MB 50ns
HDD: CompactFlash 512MB
Video: ISA 512kb AVGA2 (Cirrus Logic 5402)

@JohnBourno, looking at the picture i got confused that there's only one level of cache. To my knowledge, every 486 type cpu has at least some tiny amount of on-chip cache.

Started to google your cpu and found that you've already started a thread here in vogons on enabling the L1 cache somehow. Good luck, i hope to see another speedtest result once you fix it! (Y)

And this is the same setup but the DRx2 overclocked to 41/82 MHz .. with a CPU fan added on top of the heatsink of course.

GigAHerZ wrote on 2022-03-23, 11:44:

@JohnBourno, looking at the picture i got confused that there's only one level of cache. To my knowledge, every 486 type cpu has at least some tiny amount of on-chip cache.

Good eyes! I'm not sure why the 1 KB cache doesn't show on speedsys, but it definitely on. When I test my SXL2 with 8 kb of L1 cache on this board you can definitely see the faster "ramp" in the beginning. Perhaps the 1 KB is too small for the memory test algos in speedsys?

JohnBourno wrote on 2022-03-23, 11:46:

GigAHerZ wrote on 2022-03-23, 11:44:

@JohnBourno, looking at the picture i got confused that there's only one level of cache. To my knowledge, every 486 type cpu has at least some tiny amount of on-chip cache.

Good eyes! I'm not sure why the 1 KB cache doesn't show on speedsys, but it definitely on. When I test my SXL2 with 8 kb of L1 cache on this board you can definitely see the faster "ramp" in the beginning. Perhaps the 1 KB is too small for the memory test algos in speedsys?

I have one 486DLC with 1kB of on-chip cache as well. If i remember correctly, speedsys did show it on graphs.
Maybe at one point i have a bit of time to check it once again. Especially now as i have 90MHz crystal on board that works. 😁

Which board has the fastest memory bandwidth ?