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Is there a reason that 175W of processing power on 80 small cores at 2 GHz would be faster than, for example, an AMD EPYC 7F32, which has a similar TDP of 180W
by LeifCarrotson 5y ago
Is there a reason that 175W of processing power on 80 small cores at 2 GHz would be faster than, for example, an AMD EPYC 7F32, which has a similar TDP of 180W and 8 cores with 2 threads each that run at ~4 GHz?
Naively, assuming identical instruction sets (I know they're not), 16 threads at 4 GHz is less than half as good as 80 at 2 GHz. But that can't be the whole story.
- dragontamer 5y agoAVX2 (256-bit SIMD instructions) is huge in the encoding world. A lot of these encoding algorithms operate over reasonable block sizes (8x8 macroblocks) that ensure that SIMD-instruction sets benefit greatly. ARM only has 128-bit SIMD through NEON. Its reasonably well designed, but nothing beats the brute force of just doing 256-bits at a time (or 512-bits in the case of Intel's AVX512)