3 ms·
But IIUC you would at least need to pass the heat of the CPU though the RAM. So if you want to keep a lot of memory near the CPU you are at the very least addin
by kevincox 5y ago
But IIUC you would at least need to pass the heat of the CPU though the RAM. So if you want to keep a lot of memory near the CPU you are at the very least adding some sort of "blanket" between the heat source and the heat sink.
- nine_k 5y agoAlternatively, you could put the CPU core on top of RAM, closest to the heat sink. You also don't want to run your CPU at 80°C, else the RAM will produce much more errors. (ECC is a must anyway, I suppose.)
- kevincox 5y agoYou can definitely do that, but now your RAM is twice as far away from the CPU on average than if you put RAM on all sides. The best solution is probably some sort of hybrid where you put RAM on all side, but more on the bottom to balance the thermal effects and the latency.
- amelius 5y agoThermal resistance is linear wrt the thickness of the material, so if the layer is sufficiently thin, it doesn't form a significant obstacle.
- rbanffy 5y agoThey also mentioned both dies are thinner so they are mechanically compatible with current heat spreaders.