5 ms·
Therefore in one cycle of a 3GHz processor, light travels about 4 inches. Wild.
by glial 2y ago
Therefore in one cycle of a 3GHz processor, light travels about 4 inches. Wild.
- xhrpost 2y agoWhich is maybe part of the reason RAM needs to be so close to the CPU? Granted though most RAM access takes several CPU cycles.
- fennecfoxy 2y agoThis is exactly it, the longer your traces (or any sort of write I guess) between processor and memory, the longer delay you have to have for things to "settle". Additionally increasing capacitance means that it takes more effort (read, even longer) for the line to settle. Does make me realise I don't know so much about the super low level parts of it beyond electrons and holes. One end of the wire needs to be at a lower potential to encourage electrons to flow from that side to the other. Hmmm.
- Brusco_RF 2y agoMy favorite riff on this: at a previous job we worked on a 12GHz SERDES, which meant each inch of the cable had a different data bit on it