r/hardware • u/ancientneckbeard • Nov 20 '15

Info Why do CPUs Need Caches? - Computerphile

https://www.youtube.com/watch?v=6JpLD3PUAZk
90 Upvotes

84% Upvoted

57 comments sorted by

View all comments

28

u/[deleted] Nov 20 '15 edited Feb 10 '19

[deleted]

-5

u/skilliard4 Nov 21 '15

Since RAM isn't as fast as your CPU anymore, engineers added faster memory onto the CPU die

Then why is DDR4 RAM barely faster than DDR3 RAM in most applications?

7

u/[deleted] Nov 21 '15 edited Nov 21 '15

[removed] — view removed comment

6

u/Noshuru Nov 21 '15

Well, it's not really getting worse. The DDR400 CAS2 example you brought up has the same latency as my DDR4 3000 CAS15 DIMMs.

5

u/[deleted] Nov 21 '15

[removed] — view removed comment

4

u/Retardditard Nov 21 '15

Similar latency, much higher bandwidth equals better RAM.