will a10 6800k bottleneck crossfire 7970?

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CptBarbossa

CptBarbossa

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Jan 10, 2014
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I was running my a10 6800k with two 7770's. I upgraded recently to 7970, but was wondering if my a10 would bottleneck a pair of 7970's, and if so, could I overclock my a10 to a point where it wouldn't? I am running a FM2+ socket mobo, and seeing as how it would appear AM3+ is going by the wayside, I really am not interested in switching to an FX cpu. I am hoping some sort of enthusiast gaming cpu will come to FM2+ socket (someday). The other reason I don't want to switch is a small form factor case.

This is soley for a build competition between me and a friend for benchmarking.

If a new CPU is necesarry, can I be pointed in the least expensive solution that will not render xfire 7970's useless?

And yes, I realize I will probably have to upgrade psu before I got xfire.

Current system
CPU - a10 6800k
GPU - XFX HD 7970
MOBO - FM2A75M - pro4+
RAM - 8gigs
PSU - Corsair CX 600M
SSD - 120gig
HDD - 1tb

Thanks all.
 
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CptBarbossa

CptBarbossa

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Jan 10, 2014
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Sorry, I accidently posted best solution.

I guess I need to be more specific. I have an mATX case that only supports 4 expansion slots. I really like this case and dont want to change it. as of right now the only reasonably priced mobo that I can and do crossfire is the one I have now.

If this is innacurate information please point me in the right dirrection. About the largest I want to go in case size would be 5 expansion slots, but that is still pushing it. I like the mobility and hate lugging a huge case around.

I would consider FX series, but only if I can somehow get the form factor out of it.
 
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maddogfargo

maddogfargo

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Nov 28, 2006
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The problem is you need a 990FX board to crossfire or SLI properly. This chipset supports 2 GPUs at x16 PCIe.

Going with a lower motherboard like a 970 or 960 will do 1 GPU at x16 and the other at x4 or x8.

The motherboard limitation will contribute to the bottleneck quite a bit. And I am not aware of a Micro-ATX 990FX motherboard.
 
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ksham

ksham

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Mar 29, 2013
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I recommend just not doing CrossFireX. The HD 7970 is plenty powerful and bottlenecking it with your weak A10 isn't helping. There are no Micro ITX motherboards for the FX socket but you can get a MicroATX one but they are all bad. Disable your A10 integrated graphics.
 
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CptBarbossa

CptBarbossa

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Ksham - a10 graphics are automatically disabled when you have a discrete gpu (unless you xfire it with a discrete such as 7750). A10 also isn't a TERRIBLE cpu. I know its not the best for gaming but from all the research I have done it is somewhere between fx 4300/4350, and has pretty good single threaded performance.

I know the overclock capabilities of the a10 is close to (if not at) 5.0ghz. At that overclock will it still bottleneck the xfire?

I also know my mobo runs one card 16x and one at 8x, but according to my research (if I am wrong please explain why), the bottleneck at 8x is not very significant.

Anyone heard of any hope for a good future cpu for the FM2+ socket?

 
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ksham

ksham

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Mar 29, 2013
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Oh sorry, I misread your post. I sincerely apologize. I thought you meant you want to CrossFireX your A10 with a HD 7970. For CPUs, it's not really about how many gigahertz it runs at. It also has to do with how many instructions it can process in that number of cycles. So a CPU at 2Ghz with 1 instructions per cycle (IPC) would be the same as a CPU at 1Ghz with 2 IPC. So Ghz itself tells very little about the CPU's capability.

With a pair of HD 7970, the A10 will bottleneck it. It may be okay with one HD 7970, but with two, the A10 won't be able to keep up.

There's no noticeable bottleneck on running them at x8/x8.

And I have not heard of any good future cpu for the FM2+ socket. I barely hear good news for the AM3+ socket. The new CPUs 9000 series are not worth it. So that's up in question.
 
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