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Hello, I was wonder if I was doing something wrong to fully utilize my 4x Dell R930 4xE7-4830 v3, 512 GB DDR4. It seems as though after three instances there are MASSIVE diminishing returns.
The biggest issue you'll have is decode. Low clock speed xeon's are not ideal for this typically but since your using x265 which is a very CPU intensive, you should get away with it.
I wouldn't have thought memory throughput would be an issue at 1080p, but it's difficult to say. We haven't yet enabled numa on x265 which should allow it to better handle multi-socket machines.
What sort of drop-offs do you see with the 4th instance?