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Minimum FX CPU to Avoid BottleNecking 7870 Tahiti LE.

post #1 of 9
Thread Starter 
Basically,

I have not had a FX series since FX-6100, It was bottlenecking my 7970, I skipped vishera. However I am at a complicated crossroads of picking between the 8120, 6300 or a 4570 currently on sale on newegg.

if theres a sub $200 CPU that wont bottleneck the 7870 LE by AMD I will go for it.
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post #2 of 9
The 8320 and 8350 are sub 200$ CPUs...
post #3 of 9
Thread Starter 
Quote:
Originally Posted by jameyscott View Post

The 8320 and 8350 are sub 200$ CPUs...


8350 Still showed a slight bottleneck with an 7970 on friends system downclocked to 7870 XT Speeds. That disabled GCN portion might help but yeah...
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post #4 of 9
the 8350 are AMDs best cpus.... Anything less will make the bottleneck worse...


What do you mean the 7970 downclocked to 7870xt speeds?
Edited by Quesoblanco - 10/30/13 at 1:03pm
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post #5 of 9
I'd suggest getting the 8320, though. It can easily overclock up to 8350 levels and above. The only problem with these processors is you have to get a beefy board in order to make them shine. Like the Gigabyte UD7, ASUS Crosshair, etc.
post #6 of 9
Quote:
Originally Posted by Feyris View Post

8350 Still showed a slight bottleneck with an 7970 on friends system downclocked to 7870 XT Speeds. That disabled GCN portion might help but yeah...

With what games? How did you test for a bottleneck.

The reality is there is very little CPU bottleneck @ 1080p with 9/10 games, as proved here (test was done with an OC 7970):

http://www.ocaholic.ch/modules/smartsection/item.php?page=13&itemid=1117

Core i5-4670K Stock 100.00 %
Core i5-4670K 4.5G 101.02 %
AMD FX-4350 Stock 91.09 %
AMD FX-4350 4.5G 92.79 %

Conclusion:
A 83x0 will be less than 5% behind a 4670k @ 1080p. And if there is any bottleneck at all, it will be very minimal.
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post #7 of 9
Quote:
Originally Posted by Feyris View Post

8350 Still showed a slight bottleneck with an 7970 on friends system downclocked to 7870 XT Speeds. That disabled GCN portion might help but yeah...

eh.. when i tested a r9 280x i didn't get any bottle necking.. unless you call 1% a bottle neck.. ( 99% usage in demanding situations, 100% in stress testing)

if you want to pop into the FX 83XX club you'll see a few users running tri or quad fire 7970's, they experience no bottle necking.

fyi 83XX > 8150 by a LONG shot. that is like like comparing a 3770k to a 2700k.


if your buddy is running his 7970 in an 8x or 4x slot (why anyone in their right mind would do that is beyond me) then he might see some degraded performance.

that however has absolutely nothing to do with the card or the processor, its called human error.

fyi, the 8 core fxs don't bottle neck the brand new amd cards either wink.gif (i've not seen any FX+ 780 Ti yet so can't comment)
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post #8 of 9
Quote:
Originally Posted by Feyris View Post

8350 Still showed a slight bottleneck with an 7970 on friends system downclocked to 7870 XT Speeds. That disabled GCN portion might help but yeah...

No bottleneck here with my 8350 and 7970 and I haven't seen one game it was a bottleneck in.

Here's Metro LL, and Crysis 3.



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post #9 of 9
No bottle neck with having a powercolor 7879 tahiti le, and 8350
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