Sandbo

Still struggling between getting 3900X now or wait till September for 3950X.
It's 50% more expensive for 22% more performance overall, but hell I think I want to get the best and forget the rest.

Sandbo

引用:

原帖由 bebird 於 2019-7-8 09:52 發表

3950X
you use for professional purpose

Not necessarily, though I sometimes use my 2700X to do computation, I mostly use my Threadripper system.
The performance difference is still minimal between 3900X vs 3950X, and it seems I should rather invest more on the upcoming Threadripper.

Sandbo

引用:

原帖由 bebird 於 2019-7-8 11:40 發表


no need to buy 3 series

3950X is still much faster than 1950X in many ways, given the former has superior single threaded performance and higher base clock.
Though, 1950X still has an edge in cases where memory is read/write often due to its quad channel memory.

Sandbo

ok, ordered 3900X

Sandbo

引用:

原帖由 Sandbo 於 2019-7-9 00:14 發表
ok, ordered 3900X

Just cancelled my order. See this:

Sandbo

引用:

原帖由 qcmadness 於 2019-7-11 21:11 發表

what do you mean?

These charts show the intercore latencies of different CPUs, including a 3700X, 2700X and a 3900X.
It reveals (not to my surprise) that 3700X's has two CCX of 4+4 core, and 3900X has four CCX of 3+3+3+3.

Looking at 3900X's chart, you will see that there are only 3 cores with small latency, and the use of any extra core is going to introduce a tripled latency.
The problem is then any applications currently optimized to use 4 cores will need to access the extra core and could be significantly slower. This is likely to generate a problem in certain games.
As a result, I think I will instead get the 3950X.