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by butvacuum
19 hours ago
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Desktop DDR rarely exceedes 64bits(you have to combine more than one dimm). Since RAM is a parallel bus that means 64 conductors that have to be impedance and length controlled. GPUs use >192bit busses, with 512bit in the high performance GPUs. So that's now 512 conductors. 512 conductors that have to be exactly the same length. Make them longer you'll say- now you just lost your high memory clocks to propigation delay and parasitics. Seeing the problem? |
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