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A Look at AMD's Threadripper CPU Hardware Modes (Page 4)

By Steven Bassiri on Sep 20, 2017 05:20 pm CDT - 1 min, 41 secs reading time for this page

Handbrake, SuperPI, and ScienceMark

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).

A Look at AMD's Threadripper CPU Hardware Modes 13 | TweakTown.com
A Look at AMD's Threadripper CPU Hardware Modes 14 | TweakTown.com
A Look at AMD's Threadripper CPU Hardware Modes 15 | TweakTown.com
A Look at AMD's Threadripper CPU Hardware Modes 16 | TweakTown.com

When I initially tested the 1950X, I noticed that handbrake wasn't taking advantage of all threads and cores as it might on a much lower count CPU. That, of course, differs with what you do in handbrake, whether it be changing from one codec to another, from one resolution to another, or just tuning quality and the like, the performance differences will differ. We test using the "Normal Profile, " and in our UHD tests we take a 4K video and turn it into a 1080P video, and in our 720P tests, we change the codec of a 720P video.

HandBrake in UHD and 720P loves the 1950X with SMT disabled, but with distributed memory mode. Disabling half the CPU cores also doesn't cut performance in half, but rather reduces it by roughly 25%.

ScienceMark did show that SMT OFF/NUMA mode had the best memory performance and overall score in the benchmark, SMT OFF/NUMA is the opposite configuration to what is the default configuration (SMT ON/UMA).

SuperPI 32M did best with NUMA mode (lower latency) and with SMT ON, even better than with SMT OFF in the same NUMA memory mode. However, in UMA memory mode, the CPU did better in SuperPI with SMT OFF.

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Steven Bassiri

ABOUT THE AUTHOR - Steven Bassiri

Steven went from a fledgling forum reader in 2003 to one of the internet's brightest stars by 2010. Armed with an information systems degree, a deep understanding of circuitry, and a passion for tech, Steven (handle Sin0822) enjoys sharing his deep knowledge with others. Steven details products down to the component level to highlight seldom explained, and often misunderstood architectures. Steven is also a highly decorated overclocker with several world records under his belt. He brings that knowledge and experience to TweakTown.

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