Motherboard (C621a chipset) support for Xeon W 3000 series

RolloZ170

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Apr 24, 2016
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saw a Xeon W-3335 QS running on a X12SPL-LN4F (X12SPL-F is the same pcb with 2 LAN not soldered)
but 16 PCIe lanes of the Xeon-W are not connected.
 
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Spartus

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That is very interesting, thank you! I'll explore this option (weigh the risk). I unfortunately can't imagine needing a single socket xeon scalable board board if it doesnt work out. Dual socket or whats the point.
 
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Phong Nguyen

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I'm happy to report that I just booted a Xeon W-3335 on an X12DAI-N6 (A dual socket board clearly meant for xeon scalable).
Have you encounter any glitch or incompatibility issue with Xeon W-3335 on X12DAI-N6? I am thinking of running the same CPU under X12SPi-TF. Thanks!
 

Phong Nguyen

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saw a Xeon W-3335 QS running on a X12SPL-LN4F (X12SPL-F is the same pcb with 2 LAN not soldered)
but 16 PCIe lanes of the Xeon-W are not connected.
Xeon W-3335 supports 64 PCI lanes. Thus we have 48 lanes connected and 16 unconnected. X12SPL-LN4F has 7 PCIe slots. Are you unable to use a particular PCIe slot(s)? Thank you for the info.
 

Phong Nguyen

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no, just can't use all the lanes of the Xeon W. and Persistant memory is not suported with Xeon W.
X12SPL-LN4F has these PCIe slots.

Lanes Slot
---------------------------------
(16) 2 x PCIe 4.0 x8,
(16) 1 x PCIe 4.0 x16,
(8) 1 x PCIe 4.0 x8 (in x16 slot)
(24) 3 x PCIe 3.0 x8

In total, 64 lanes are required. If 16 lanes on Xeon W-3300 CPU are not connected, then some slots
above are not accessible right?

Maybe I misunderstand the information. If that is the case, please explain. Thanks!
 

RolloZ170

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Apr 24, 2016
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In total, 64 lanes are required. If 16 lanes on Xeon W-3300 CPU are not connected, then some slots
above are not accessible right?
ooh we are on X12 not X11.
sorry i was wrong because all 3rd gen SKUs deliver 64 PCIe lanes.
even a Xeon Gold 6326.
forget what i have written.