That'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
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