3 ms·
About the RAM. I doubt they wanted to do that, since basic gpu function is to render a frame in as little ms as possible. Currently VRAM is latency optimized on
by eurekin 3y ago
About the RAM. I doubt they wanted to do that, since basic gpu function is to render a frame in as little ms as possible. Currently VRAM is latency optimized on consumer gpus and all memory chips are an inch away from the gpu. Light only travels as far in the gigahertz realm. Thats why they started mounting vram chips on both sides of the board, cause there was no more place left on the first side.
Just checked: light travels 30cm in one nanosecond. So if the gpu is running at 4GHz it goes only 7.5 cm.
- redox99 3y agoVRAM is not latency optimized. VRAM has worse latency than your CPU RAM. The reason why it's mounted closer is because of signal integrity because of higher frequencies, not because of latency.
- eurekin 3y agoInteresting. Where can I read more about that?
- redox99 3y agoSorry can't provide any resources right now. If you search a bit I'm sure you'll find some latency comparisons between DDR and GDDR. But basically GPU memory (GDDR5/6/6X/etc) is optimized for bandwidth (because GPUs need to move a lot of data, have few branches, few unknown data dependencies, high spatial locality). CPU memory is more optimized for latency (because of branchy code).