What's up with CAS Latency's?

colinstu · 06-26-2007, 02:02 AM

DDR was around the 2-4 range, DDR2 was in the 3-5 range, and now DDR3 is in this horrible 5-9+ range.

Everything gets better about memory every time the next version of DDR is released. More memory, more efficient, faster (clock rate at least), but for some reason the CAS Latency also rises.

Why is this happening? What's causing it? Are the people who are developing this stuff gonna think about making lower CAS Latencys?

Micro420 · 06-27-2007, 10:43 PM

Well, I'm sure there's a logical and physical reason why they can't lower the CAS latency. But I'm sure there are higher payoffs with DDR3 memory.

Crito · 06-27-2007, 11:14 PM

To move more data faster you either increase the clock speed or you widen the path. That's why graphics cards use 128-bit and 256-bit GPUs. It's not just about how much memory you can address.

colinstu · 06-27-2007, 11:27 PM

Quote:

Originally Posted by Crito

either increase the clock speed or you widen the path

And why can't both be done? I'm guessing it will be done sometime in the future, but as of currently and the current DDR3 on the market, yea - it can run really fast, but with a latency like that I'm really heasentant(sp?).

Crito · 06-28-2007, 07:27 AM

It's a lot easier to simply up the clock speed, but that draws more power, generates more heat and introduces more latency.