290x 390x crossfire questions

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Componentgirl90

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Jan 9, 2015
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Good morning everybody.

I have a 390x 8gb and a 1440p monitor. I noticed that some of the 290x cards on eBay are pretty cheap now and have been thinking about getting one to crossfire with my 390x.

Is 4gb enough for 1440p? what about 4k? Will my EVGA 850W G2 be enough? Does this configuration work as well as a two 290x? When buying on eBay what should I ask the seller?

Thanks for comments in advance.

P.s. I know it would be better to get a single 1080 and crossfire sometimes has issues but I can't afford a 1080 and this is just a cheap way to get a big boost.
 
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bicycle_repair_man

bicycle_repair_man

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I'd suggest you stick with the 390X until you can afford a new GPU like a GTX 1070. There's nothing to stop you from using a 390X and 290X in Crossfire, but you're entirely dependent on developers optimising their games for multi-GPU setups. There's also the issue of increased heat, especially when you have a 390X.

I have a GTX 770 4GB and don't have a problem with 1440p.
 
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Componentgirl90

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@bicycle - I have been semi aware that heat will be an issue as these babies run hot. I hear the 290x can reach 95 quite easily. My case is not great for thermals so I would probably benefit from a new case come summer 2017. I guess the only issue with heat is that the components will fail faster?

I prefer the crossfire option because I am prepared to accept the pitfalls of crossfire and I do not want to go through the hassles of selling my 390x. Buying a 1070 is actually just about an option at a stretch but I do not see that card as a big enough upgrade from the 390x. 290x *2 when working should outperform a 1070. I know this is not a popular view but the 390x on its own may well even have more or less parity with the 1070 in a couple of years in dx12 titles (assuming the 1070 performs like the 980ti which it may well not).

Good to hear 4gb isn't a problem at 1440p.
 
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bicycle_repair_man

bicycle_repair_man

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It's up to you of course, but I think going down the Crossfire route is a mistake if you can afford a GTX 1070.

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An increase in heat won't just affect the GPUs, it will also affect the motherboard, CPU and drives. If a component gets too hot, performance will take a nosedive. If it gets really bad, the PC will simply shut down.

The DX 12 argument has been blown way out of proportion in my opinion. What really matters is driver optimisation. Rise of the Tomb Raider on DX 12 performs better on Nvidia cards because Square Enix partnered with Nvidia. The reason why games such as Hitman perform better on AMD cards is not because of DX 12, it's because IO Interactive partnered with AMD.
 
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Componentgirl90

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I expected to be brought down to earth about the comment about the 390x vs 1070 :p I will do more research on heat.

It has been probably been blown way out of proportion regarding hitman. The performance gap is closed no doubt in large part due to it being an AMD title. I think from the data available though that it is clear there is an extra effect in dx12 due to asynchronous compute, which is why you see non AMD titles also being closer in performance between 980ti vs 390x (idk about 1070 tbh if it has async compute or not etc)in dx12 than they would have been in dx11. But obviously the 390x is far outperfomed by the 980ti and 1070 in dx11 as ur graphic shows comparing the 1070 with the 390 (roughly the same as 390x and 980ti).
 
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