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by Legend2440
256 days ago
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Memory access times have not significantly improved in many years. Memory bandwidth has improved, but it hasn't kept up with memory size or with CPU speeds. When I was a kid you could get a speedup by using lookup tables for trig functions - you'd never do that today, it's faster to recalculate. 2D vs 3D is legit, I have seen this law written down as O(sqrt N) for that reason. However, there's a lot of layer stacking going on on memory chips these days (especially flash memory or HBM for GPUs) so it's partially 3D. |
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We could say that it actually became worse and not better if we put it more into the context. For example, 90ns latency coupled with a 3GHz core is "better" than 90ns latency coupled with a 5GHz core. In latter, CPU core ends up being stalled for 450 cycles while in the former case almost half as much - 237 cycles.