In my case, with the MS03-CE0 I (back) ordered, it's an 8 memory slot board. You can't get more than 1 DPC. It's a matter of running with all the slots filled with smaller DIMMS or half filled with larger ones. The cost difference of the 2 configs is not significant.
ES Xeon Discussion
- Thread starter britinpdx
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I understand that that 8 channels are 1DPC, but i misunderstood that you already ordered the 8 channel board. I am mentioned the 2DPC cpu speed decrease because the 'advantage' of the 4-channel 2 DPC board is said to be more upgradeable, but an upgrade from 4 dim to 8 dim will detriment speeds, even its only 10%. What still is not clear to me if besides the difference in cost, if there is ever any technical advantage of the 4-channel workstation board vs the 8-channel server boards if the cpu is 8-channel. Is by design the bandwidth of the 4-channel board not always limited to half the bandwidth of the 8-channel? I mean would running 4 DIMMs in the 4-channel board, give the same/similar performance, as the 4 DIMMs in the 8-channel board? Is there any memory configuration in which the 4-channel board has advantages?
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with 4 mem.channels 1/4 of the core count have only single channel mem.bandwidth. with low latency.
4 channel = cheaper, Xeon W?240xx support only 4 channels, enough/good for lower core counts,
with 4 mem.channels 1/4 of the core count have only single channel mem.bandwidth. with low latency.
Thanks, o I wish i asked this one day before... i just ordered QYFS, but now i see that Q0KG E0 is just a bit more expensive. Maybe i can still change it. But strange that E0 should work, on the ASUS dual socket board, while a while ago you wrote : 'stepping E0 was tested, doesn't POST on W790 Ace...' for the single socket board. And for D0, things are the opposite (works at single socket w790, not on dual socket). Quite a puzzle all of this, at least to me.
ASUS Z13PE-D16 is built on a server chipset C741, the W790 is built on a different chipset - W790 (hence the board name). It is not just a cutdown version of the dual socket board, they have different sets of features (like overcloaking support on W790) and very different BIOS. W790 does not work with production like steppings (meaning when CPU identifies itself as Xeon Platinum 84xx rather than the earlier Genuine Intel 0000%@). And the BIOS on C741 often has support for such earlier steppings removed so they only work with production like late steppings.
ASUS Z13PE-D16 (C741) supports SPR-SP not SPR-WS
i talk about SPR-SP stepping E0 ES not WS parts.
ASUS W790 (Ace/SAGE) (W790 chipset) supports officialy only SPR-WS, but as a strange exception SPR-SP D0 ES.
we know Intel stopped Xeon support on desktop/HEDT after X99/C612.
but QLRX (7900X / W-2155 ES B0 not prod. stepping) work with C422 and some X299 boards.
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not fully correct. nothing insinde looks at brand strings, there are working parts with "0000%@"
but they are SPR-WS ES steppings E0 and up.
checked some other BIOS but 0301 is first release of Z13PE-D16 and already supports Emerald Rapids.
Z13PP-D32 supports D0 ES(806f3) in first BIOS 0401
but later D0 ES(806f3) MCU is removed and added MCU for SPR-HBM and EMR-SP(Emerald Rapids)
this can not caused by limited space in BIOS, Gigabyte managed to hold all MCUs in they're C741 BIOS.
Thanks for checking the Asus boards with old bios. Even if it works The z13PP-D32 looks very scary to me and i need pcie and sort of normal shape to find a case with high reasonable silent coolers.
Interesting so if i understood it correctly ASUS W790 would also not support any official normal
About Q0KG E0, i read in this forum that its E0. But in the screen shot of seller...
...the stepping part seems blank. How to recognize what are E0 steppings? Do they start Q0.., or is it the 4?
The sellers mentions compatible with GIGABYTE. But are for Q0KG (or other E0 SPR-SP) , are besides Asus and GIGABYTE other dual socket or C741 boards from brands like Supermicro, Asrock known to be working or not working?
The ASRock SP2C741D16X-2T would be quite amazing 7 pcie slots on dual socket wow.
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correct, cpuid 806F4 is stepping E0About Q0KG E0, i read in this forum that its E0. But in the screen shot of seller...
...the stepping part seems blank. How to recognize what are E0 steppings? Do they start Q0.., or is it the 4?
I’m not saying it does. It’s just my way to figure out the earlier generations of engineering samples. Ones who identify themselves as a proper model usually pretty stable and have all the model specific features enabled. And this generation it is just a coincidence that WS motherboards accept earlier versions but do not accept latest ones. Fun fact - even Intel XTU software is tricked by that engineering sample so it starts and works with D0 SPR-SP as if it was Xeon W without X - meaning multiplier is locked. But still - that is probably the first time I see XTU not complaining about unsupported CPU and exiting right away.
after stepping D0, intel reworked the SPR silicon. maybe it is very easy, E0 and up SPR-SP doesn't like DMI4,
D0 ES2 support DMI4, but later intel decided to give C741 only DMI3.
Intel Emerald Rapids Backtracks on Chiplets – Design, Performance & Cost
Competitive Analysis Considerations, Sapphire Rapids Stealthy Redesign
www.semianalysis.com
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Sorry my typing mistake, all these abbreviations are still new and not in my fingers.
It good to know that that W790 does not support SPR-SP cpu's.
But for example 8461V is 'scalable' but its only single socket, and also not WS
So if i understand correctly in asus w790 the d0 stepping of these SPR-SP 44xx, 64xx and 84xx cpu's are strangely enough supported but later steppings even official versions are not supported in Asus w790.
Does this mean that for these steppings one can buy any C741 board, and as long as one does not update the bios, these steppings are supported? Sorry i dont understand what a 806F8 MCU container, is and google was not very helpful.
HWinfo
scalable: no (don't ask)
wayness: 1S
and of course don't work on ASUS W790
yes, but i doubt it is the stepping only. W790 likes to run DMI4 with the CPU, D0 ES can, but stepping E0 and later not.
originaly intel reported for both C741&W790 DMI4, but changed C741/SPR-SP to DMI3 late.
i'll try to explain:
you see a microcode in the BIOS, 806F8, but hey ? stepping E3 CPU-ID is 806F6, why does it work ?
here is the microcode 806F8 platform Type 87
note "F8 06 08 00" and "05 00 00 00" is the intel x86 little endian format of 0x000806F8 and 0x00000005
HxD shows extended header of mcu.
the 05 00 00 00 is the count of entries.
then 5 supported cpuid's of this microcode.
F8 06 08 00
F7 06 08 00
F6 06 08 00 stepping E3
F5 06 08 00
F4 06 08 00
UEFITool can decode this too.
and MCE.py ( MCExtractor, most possible latest version )
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I tried to understand, and i will try again. But until now it was not clear. Maybe i need some more sleep, and probably also some extra education. But one thing became clear by the language settings of your screenshots.Also includes the single socket C741 right?