By "no boot" I guess you mean the system passes POST but hangs before booting the OS? Since it looks like you can access the BIOS to set L1/L2.

In that case you can try to disable "DRAM Write Burst" in the BIOS chipset options. I've found that setting does not work well when L1 is set to WB.

tryed but dont help.
L1 enabled , L2 disabled system boot fine. I benched the cpu, looks ok. Also run doom for 15min no crash.

But i had to set JP20 3-4 to get the CPU in WB mode. If i remove that jumper, like the sheet say, CPU is in WT mode..

edit: found this picture from a rev 1.5 with SK096 and the settings also work for me on 2.0! L1/L2 WB now, no crashs so far.

https://imgur.com/vTZcTDE

Bench:

Can you run ctcm from heise / c't too please?

PS.
It seems you lost a lot of memory write speed.

Here

I'm just puzzling why you have a (blue) write line of ~ 60 MB/s here in this post:

Jackhead wrote on 2024-08-26, 16:50:

Here the result, normal for the DX4 ? […]
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Here the result, normal for the DX4 ?

The attachment IMG_7235.jpeg is no longer available

and here with slowest hardware settings. Really slow 😀 I think that could be 386/33 range.

The attachment IMG_7236.jpeg is no longer available

and here:

Jackhead wrote on 2024-08-28, 16:01:

Here the Bench with P24CT jumped […]
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Here the Bench with P24CT jumped

The attachment IMG_7240.jpeg is no longer available

You can notice that the CPU name has changed, and the L1 cache is slower. 1point more on cpu bench.
L1 is in WT mode, but jumped to WB and bios is also set to WB.
Wonder what jumper is needed to get WB. As i say JP21 is jumped 3-4.

The attachment Screenshot 2024-08-28 194600.png is no longer available

-- but --
here it is at ~ 40 MB/s:

Jackhead wrote on 2024-08-30, 15:53:

tryed but dont help. L1 enabled , L2 disabled system boot fine. I benched the cpu, looks ok. Also run doom for 15min no crash. […]
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tryed but dont help.
L1 enabled , L2 disabled system boot fine. I benched the cpu, looks ok. Also run doom for 15min no crash.

But i had to set JP20 3-4 to get the CPU in WB mode. If i remove that jumper, like the sheet say, CPU is in WT mode..

edit: found this picture from a rev 1.5 with SK096 and the settings also work for me on 2.0! L1/L2 WB now, no crashs so far.

https://imgur.com/vTZcTDE

Bench:

The attachment IMG_7261.jpeg is no longer available

The attachment IMG_7262.jpeg is no longer available

I see, but with 60MB/s it was not really stable.
ATM its really solid so i take that slower write.
Well its for sure some other jumper setup working faster, but ok..

Hey, I got the same board, same CPU, same problem.
What configuration did you end up with??

I end up using the P75 AMD CPU again.