4 ms·
"You can't put enough of it close enough to the CPU because the muxes needed to select the data you need have too many FO4s[1] of fanning" So it's like in Mine
by bradleyland 14y ago
"You can't put enough of it close enough to the CPU because the muxes needed to select the data you need have too many FO4s[1] of fanning"
So it's like in Minecraft when you can't make a redstone design any more compact because of limitations in the rules of redstone adjacency.
- Symmetry 14y agoWow, sorry, that sentence I constructed there was really confusing. There are really two separate effects. On the one hand, you can only make a cell of this memory so small, so you can't pack it as densely as you'd like. The other is that you have one cell of memory you'd like to access, and an output line you'd like the data from it to go out on. And you don't want the data from any of the other N billion cells of memory to go out on that line. There are actually some structures you use to retrieve that particular bit, but the more bits you're selecting between the more delay is introduced. In most current CPU designs this is a actually a bigger deal than speed of light, at least for the various levels of on-chip cache.