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[Sorgklaan]

Short question, hoping somebody can clear this up. For Dwarf Fortress, would it be better to go with CAS 8 DDR3, or CAS 15 DDR4?

[malvado]

Depends entirely on the speed of the memory kit.

Ie, a 15 Cas 3400 Mhz memory is probably faster than a Cas 8 1333 Mhz memory.

If you are a bit more specific I should be able to tell more correctly.

[Sorgklaan]

Let's say I were to compare DDR3 and DDR4 at the same clock speed, however, the DDR3 has CAS 8 or 9 and the DDR4 has CAS 14 or 15.

My question is, would there be any actual improvement just from going up to DDR4? Or would it be entirely irrelevant?

[malvado]

DDR4 Cas 15 3000 Mhz would be slower than Ie DDR3 Cas 8 3000Mhz.

Read this one : http://superuser.com/questions/593772/calculate-performance-of-ram-using-timing-and-speed

[davsim]

It doesn't matter.

[Parhelion]

It doesn't matter.

I hate to agree, but I think Davsim may be right.  You're talking about something that is on the order of hundredth's of milliseconds, on a machine that will be multitasking anyway.  If there any going to be any bottleneck at all, it's likely going to be your CPU.

[Thief^]

Let's say I were to compare DDR3 and DDR4 at the same clock speed, however, the DDR3 has CAS 8 or 9 and the DDR4 has CAS 14 or 15.

My question is, would there be any actual improvement just from going up to DDR4? Or would it be entirely irrelevant?

CAS numbers are relative to the speed of the RAM. If they are the same speed, lower CAS is better.

At this point there is actually little benefit to going DDR4, and the motherboards aren't even future-compatible (they can't handle higher speeds) so there's not even a good future-proofing argument.