Sign in with
Sign up | Sign in
Your question

AMD Athlon x4 640 bottleneck

Last response: in Components
Share
February 21, 2013 7:05:21 PM

will my cpu with a oc of 3.5ghz bottleneck a Radeon HD 7870 GHz Edition? if so by how much?
a b à CPUs
February 21, 2013 8:40:56 PM

Depends what games you're in. If you can push it a bit further then you'll be fine, but at the speeds atm you shouldn't notice the difference, it's still gonna kick out frame rates of 30+fps at 1080p
m
0
l
a c 111 à CPUs
a b À AMD
February 21, 2013 9:18:12 PM


It will be very close to stock 965BE in performance.

Clock-for-clock it should be no less than 5% difference. In some cases larger but no more than 8-10% in the *usual* games with which AMD struggles.

m
0
l
Related resources
February 22, 2013 3:30:21 AM

i play bf3 for the most part
m
0
l
a c 111 à CPUs
a b À AMD
February 22, 2013 1:42:39 PM


I think you're good. BF3 is GPU heavy.

You might lag a bit on '64-maps' but anything below (including single player) with be held back by the GPU.

What are your RAMs speed?
m
0
l
February 22, 2013 5:00:19 PM

CPU now @3.8 and its cheap RAM so nothing fast
m
0
l
a c 111 à CPUs
a b À AMD
February 22, 2013 7:48:00 PM


Great job!

The reason I asked about your RAMs speed, AMD has *Sweet Spots* with the RAM dividers that allow you to run the sticks at stock speeds. As an example with DDR3 1333MHz, the sweet spot is a system clock of 250MHz. You simply drop the divider from stock 6.67 to 5.33

15 x 250MHz = 3.75GHz CPU
5.33 x 250MHz = 1333MHz RAMs

Enjoy your CPU -- it should not be holding you back much, if any.


Edit: I fergit ...

Leave your HT Link as close to 2000MHz as practical, and raise your IMC/NB at high as you can!

For each 10% in speed you increase your IMC/NB, memory bandwidth is increased 3-4% and latency is reduced 3-4%

It makes quite a difference in your gaming.
m
0
l
February 23, 2013 7:09:27 PM

would it be worth upgrading to AMD Phenom II X6? and btw i just bought the 640
m
0
l
a c 111 à CPUs
a b À AMD
February 23, 2013 7:59:07 PM


Not really

(unless you do more video encoding / 3D modeling than gaming - then you would benefit greatly)




m
0
l
February 23, 2013 9:02:10 PM

i just play games on my rig
m
0
l
!