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Apple Silicon chips share memory between the CPU and GPU, would that play into any calculation of the relative benefits? Presumably the GPU isn't getting the fu
by roxgib 4y ago
Apple Silicon chips share memory between the CPU and GPU, would that play into any calculation of the relative benefits? Presumably the GPU isn't getting the full benefits of a GPU optimised memory set up so the difference would be smaller?
- kllrnohj 4y agoThat's been doable on other products for over a decade. AMD's APUs and Intel's CPUs, for example, along with nearly every mobile phone SoC from the last 10 years It makes some GPGPU workloads viable that otherwise wouldn't be, but it doesn't reduce the bandwidth needs of the GPU for traditional GPU workloads so net-net you're worse off overall. You either use DDR and penalize your GPU performance, or you use GDDR (like consoles do) and sacrifice CPU memory latency. Also power efficiency of GDDR is worse, especially compared to Apple Silicon's choice of using LPDDR HBM2e gets you everything except it's expensive and limited capacity. But it'll be interesting to see how that plays out with the Xeon Max, which can also still supplement the 64GB HBM2e with some absurd channel count DDR5