How far away the memories are in space is way more critical than the speed of any one element in isolation.
Correct me if I'm wrong, but I don't think this is true. If you put instant memory a whole meter away it'll still only have a round trip of 6.6ns at the speed of light, which is approximately the latency of L2. Given how close L2 is, I don't think distance is a large factor of its latency.
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Correct me if I'm wrong, but I don't think this is true. If you put instant memory a whole meter away it'll still only have a round trip of 6.6ns at the speed of light, which is approximately the latency of L2. Given how close L2 is, I don't think distance is a large factor of its latency.
The problem is resistance and parasitic capacitance scales with wire length, e^(-t/RC) is going to limit your max frequency.