MP 7,1 Xeon Silver / Gold CPUs

[Tony Danger]

I know the 7,1 supports a handful of the W-3xxx CPUs etc, but what about dropping in something else from the LGA 3647? Is anything compatible or are they all not supported?

 

[StuAff]

AFAIK, only W-series Cascade Lake Xeons work- so the ones Apple used, plus the M & non-M variants thereof. Nothing else, I think. Greg Gant's upgrade blog lists:

Cascade Lake	28 core	Xeon W	W-3275M	2.5	4.4	2933	205W	2TB
Cascade Lake	28 core	Xeon W	W-3275	2.5	4.4	2933	205W	1TB
Cascade Lake	24 core	Xeon W	W-3265M	2.7	4.4	2933	205W	2TB
Cascade Lake	24 core	Xeon W	W-3265	2.7	4.4	2933	205W	1TB
Cascade Lake	16 core	Xeon W	W-3245M	3.2	4.4	2933	205W	2TB
Cascade Lake	16 core	Xeon W	W-3245	3.2	4.4	2933	205W	1TB
Cascade Lake	12 core	Xeon W	W-3235	3.3	4.4	2933	180W	1TB
Cascade Lake	8 core	Xeon W	W-3225	3.7	4.3	2666	160W	1TB
Cascade Lake	8 core	Xeon W	W-3223	3.5	4.0	2666	160W	1TB

 

[avro707]

what about dropping in something else from the LGA 3647? Is anything compatible or are they all not supported?

Not supported, otherwise they would have been listed on the topic here already. People have used Xeon Gold 6212U but the moment they do NVRAM reset it stops working and the machine won't start up.

Unfortunately we are stuck with hard to find and expensive Xeon W CPUs (at least the desirable ones people want like 16, 24 and 28 core).

W3175X also won't work reliably. More details:

https://forums.macrumors.com/threads/mac-pro-cpu-compatibility-list.1954766/post-28102571