4 ms·
This is not exactly the reason, but trace length/loss is a major problem. Laptop SODIMMs are already severely limiting DDR5 bandwidth, server/desktop DIMMs are
by brucethemoose2 3y ago
This is not exactly the reason, but trace length/loss is a major problem.
Laptop SODIMMs are already severely limiting DDR5 bandwidth, server/desktop DIMMs are getting close.
Users aren't gonna like it, but unswappable packaged RAM is coming to most CPUs.
- anonymousDan 3y agoWhat do you mean by packaged RAM and what protocol does it use that would be faster than DDR5?
- brucethemoose2 3y ago> What do you mean by packaged RAM Depends. Apple uses LPDDR5X on a cheap substrate, which is basically just RAM chips soldered to a tiny motherboard, and that is already very fast. But it could also mean HBM on an expensive interposer or cheaper Intel EMIB, or something like Samsung's proposed Wide I/O, or even something new like stacked RAM with TSVs. CPU/RAM packaging is getting increasingly complicated. > what protocol does it use that would be faster than DDR5 Depends, but it can just be straight up DDR5. SODIMMS are terrible because they need 1.35V (vs 1.1V stock DDR5) for really slow speeds and terrible ram timings, while soldered DDR5 and LPDDR5X do not. The closer the DDR5 gets to the CPU, the faster, more power efficient and lower latency it gets.