Comment by Sweepi
3 years ago
8 Zen4 cores dont beat 16 Zen2 cores in multicore. Either Geekbench 6 does not utilize all cores, or the 3950x setup is borked.
3 years ago
8 Zen4 cores dont beat 16 Zen2 cores in multicore. Either Geekbench 6 does not utilize all cores, or the 3950x setup is borked.
Geekbench 5 pretended that all multi-core workloads were embarrassingly parallel by running N independent copies of the single-core test across N cores, with zero communication between threads. Geekbench 6 takes a more realistic approach so Amdahl's Law applies and it doesn't scale linearly with more CPU cores.
Geekbench 6 multi-core is a single-task benchmark. It runs one task at a time, using multiple threads when possible. This makes it scale worse and favor single-core performance more than benchmarks that run multiple independent tasks in parallel.
GB6 will use the Zen4's AVX512, which Zen2 doesn't support.