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100 GB/s is the bandwidth of six DDR4 channels. Knights Landing has 500 GB/s of local memory bandwidth, plus the same 100 GB/s of a Xeon for DDR4. If future Xe
by bonzini 10y ago
100 GB/s is the bandwidth of six DDR4 channels. Knights Landing has 500 GB/s of local memory bandwidth, plus the same 100 GB/s of a Xeon for DDR4.
If future Xeons integrated RAM like Knights Landing does, this would make GPUs less interesting. But KNL can already be used as the main CPU, if I remember correctly.
- geezerjay 10y agoYou're ignoring the main factor: cost. Intel's offering costs as high as €4000 per processor, which come with a meager 8 cores. NVidia's offering sells, right now, for less than €1000 a pop.
- daemin 10y agoWhat about ongoing electricity costs? IIRC my graphics card chews up more power than my CPU.
- geezerjay 10y agoA delta of $3000 per component buys you a whole lot of electricity. Furthermore, the performance of each of NVidia's GPUs falls somewhere between 5 and 20 teraFLOPs. A Haswell Xeon gets you about half a teraFLOP for around 1/3 of the power consumption of a NVidia Tesla P100 GPU.
- bonzini 10y agoI am not sure where you get those numbers. Both a Knights Landing Xeon Phi and a Tesla K80 are about 3 teraflops for $5000. Comparing GPUs with Xeons makes no sense.