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will 2 R9 280x in crossfire bottleneck an FX 8350?

JUMPERMAN
By JUMPERMAN
in Graphics Cards
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will 2 R9 280x in crossfire bottleneck a FX 8350? what is the recommended over clock to stop bottlenecking?  
And what PSU is recommended for this configuration?? 

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750w-850w.

a 8350 will bottleneck 280x's probably. 

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If anything the 8350 will slightly bottleneck the 280xs lol. I'd recommend an 850watt power supply, at least 80+ gold and from either evga, cooler master or corsair.

 

by the way @JUMPERMAN , make sure you follow your posts so you are notified when someone answers.

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750w-850w.

a 8350 will bottleneck 280x's probably. 

 

+1, the 8350 will be the weak link if any.

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If anything the 8350 will slightly bottleneck the 280xs lol. I'd recommend an 850watt power supply, at least 80+ gold and from either evga, cooler master or corsair.

 

by the way @JUMPERMAN , make sure you follow your posts so you are notified when someone answers.

Thanks for the advice mate. what CPU do you recommend for running this crossfire configuration?

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Fx 8350 will bottleneck the 280xs in a some games.

Planetside 2- Very heavily, but Every CPU bottlenecks Planetside, unless your graphics card is complete shit.

Minecrart- Morden Graphics cards can easily push Mine craft well past 800 Fps , Just the issue is CPUs, My 8320 pushes ~130 Fps in mine craft on servers, ~140 Single player. ~220 W/ Optifine which uses more cores.

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Do you already have the cards? If you're playing at 1080p, a 290 is a better bet. 280x in crossfire doesn't fare to well when it comes to minimum frame rates.

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I don't play games but the 700W PSU is fine even when both cards are under 100% load such as when password cracking or mining.

ok fair enough. thanks for the response mate! 

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ok fair enough. thanks for the response mate! 

They're just about even actually. Maybe a very slight overclock and the 8350 will be just perfect with two 280x's

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My friend has 2 Titans and a 8350 and really no bottleneck, you should be fine.

 

And a 750W 80plus Gold will do.

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you will be ok :P id go with one 290 or 290x if thats still an option tho since we all know, one more powerful card>two less powerful cards

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I don't play games but the 700W PSU is fine even when both cards are under 100% load such as when password cracking.

 

That sounds a bit dubious :P

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Planetside 2 favors Intel CPUs more, my old i5 3570 + 7850 is beating my friend's 8350 + 7870.

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I didn't run notice any bottleneck issues when I ran my Dual-X HD 79790 with a Vapor-X HD 7950 in Crossfire  on my FX-8350 system (the HD 7950 was purchased for another system of mine. Was just testing it for a bit to make sure it's not defective / broken).

 

Just a note, my FX-8350 is clocked @ 4.8GHz.

A R9-280X is a rebranded HD 7970

 

A 750W PSU should be perfectly fine, but I'd personally go for a 850W.

Using a power meter, with my FX-8350 and HD 7970 overclocked, I pull about ~541W from the wall during load. Being a 80 PLUS Bronze PSU, that's about 460W that the actual system uses. The rest is given off as heat.

Assuming another GPU adds another 200W - 250W (takes into account for overclocking, etc), that's going to be about 600W - 650W that the actual system will use.

 

Given that their overall system power draw for two R9-280X, over at AnandTech, was about 671W while running Furmark (lower with realistic game load), that's about right.

http://www.anandtech.com/bench/product/1058

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I really don't think an 8 core CPU will bottleneck 2x 280x's, but best to get an ~800w psu like everyone said.

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you will be ok :P id go with one 290 or 290x if thats still an option tho since we all know, one more powerful card>two less powerful cards

Yeah, i got a 280x for my birthday from my best friend (because i needed an upgrade, i was running this 5 year old generic GPU). so yeah not an option unfortunately, its a little late for a 290.  

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I really don't think an 8 core CPU will bottleneck 2x 280x's, but best to get an ~800w psu like everyone said.

More cores do not mean better performance. It's still going to have trouble feeding those two GPUs since Vishera cores are incredibly weak.

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More cores do not mean better performance. It's still going to have trouble feeding those two GPUs since Vishera cores are incredibly weak.

Very true

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Very true

I think AMD was intending to release Vishera around the time Westmere was released, benchmarks show that their single core performance is very similar.

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Thanks for the advice mate. what CPU do you recommend for running this crossfire configuration?

 

Oh, the FX is fine, however if you have the extra money and will mostly game on your pc I recommend an intel core i5 4690k with an asus z97-a motherboard and an aftermarket cooler for overclocking. Another thing that is worth it (if you have the budget) is going for r9 290s instead, they can drive 4k no problem in crossfire.

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More cores do not mean better performance. It's still going to have trouble feeding those two GPUs since Vishera cores are incredibly weak.

Yeah but they're not gonna shove 8 cores into a shitty cpu :P Vishersa is kinda old though so I guess you're right

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