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A Look at AMD's Threadripper CPU Hardware Modes

By: Steven Bassiri | Guides | Posted: Sep 20, 2017 10:20 pm

CINEBENCH, wPrime, and AIDA64

 

The CPU was tested in five different modes. The first mode is 1950X Legacy Mode SMT ON/NUMA, which results in 8C/16T, uses local memory access (quad channel), and leaves SMT on (Gamer Mode in Ryzen Master).

 

The second mode is 1950X SMT OFF/UMA, which is 16C/16T with distributed memory access. The third mode is 1950X SMT OFF/NUMA, which is 16C/16T with local memory access. The fourth mode is 1950X SMT ON/NUMA, which is 16C/32T with local memory access.

 

 

The fifth mode is 1950X SMT ON/UMA, which is 16C/32T with distributed memory access, and it's also the default mode the CPU operates in (Creator Mode in Ryzen Master).

 

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UMA and NUMA modes have very little impact in the rendering benchmark CINEBENCH R15; the only surprise is that we find single core performance drops slightly with SMT OFF and UMA. I didn't expect to find any deviation in wPrime with UMA and NUMA modes, but I did find that with SMT OFF, NUMA was a bit faster than UMA. The opposite is true with SMT ON. However, the differences with SMT ON are within the margin of error.

 

AIDA64's FPU tests seem to not care at all about memory access, and they don't care about threads, but they do scale perfectly with core count, as that is the only difference between Legacy mode and the other four modes.

 

AIDA64's memory latency results show that NUMA has significantly lower latency, but bandwidth results show that UMA provides less bandwidth than NUMA, except in memory writes (this is the opposite of what we predicted).

 

Perhaps it's our out of the box testing method where the memory is running 2133MHz, or AIDA64 updated the program (they make major changes), but we didn't find that UMA provided higher memory bandwidth, although we did find NUMA did provide significantly lower latency.

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