Crossfire r9 390x 8gb and r9 290 4gb

kansasboy001 · Sep 4, 2015

I had 2 msi reference r9 290 4gb cards running in crossfire, I had to RMA one and msi sent me a r9 390x 8gb gaming as a replacement. I know technically the 390X and 290 will work in crossfire even with the memory difference, but will the 290 and it's 4gb memory hamper the 390X's performance enough to warrant me purchasing another 390X even if I oc the 290 to the 390x's speeds?

littleleo · Sep 4, 2015

That is a good question, put the 390x as primary and lets us know how it works out ;^D

Mysticking32 · Sep 5, 2015

Wait? I thought you could crossfire an r9 390x with an r9 290x. I don't think you can crossfire an r9 390x with a regular r9 290? I'm pretty sure of that. But I could be wrong.

kansasboy001 · Sep 5, 2015

Well CCC allows me to enable crossfire with the 390X and 290. There would be no reason why it wouldn't work as you could crossfire a r9 290X with a 290 and the 290X is the same as the 390X. Now I haven't been able to try any Benchmarks or games yet to see how it performs. I think the only issue could be the difference in memory.

Mysticking32 · Sep 5, 2015

That's pretty amazing. If you can, can you get a 3dmark firestrike benchmark in? I'd love to see the results.

kansasboy001 · Sep 5, 2015

I'll download 3d mark, but considering kombustor won't even load the benchmark if crossfire is enabled I don't have my hopes high. Looks like I might have to rma my 290 so they'll send me another 390x

kansasboy001 · Sep 5, 2015

I'm getting around the 11300 range in fire strike. This is actually lower than what I was getting with 2 290s which was about 13500. The crossfire utilization is also strange. I'll get 100% on the 290 (gpu 2) but the 390X rarely goes over 70% and is usually around 50%. The 290 always has the higher utilization.

Mysticking32 · Sep 6, 2015

that's pretty interesting. So it does give you a little bit of an increase over the stock 390x. I usually get around 11000 with one 390x. I honestly don't remember reading that the 290 and 390x were crossfire compatible. Can you post your results here?

Here are mine with 1 390x. http://www.3dmark.com/fs/5888632 (overclocked to 1134mhz)
http://www.3dmark.com/fs/5907115 (stock msi)
http://www.3dmark.com/fs/5897446 (stock msi)

kansasboy001 · Sep 6, 2015

Yes it gives an increase over 1 390X but the performance is not as good as 2 290's my best guess is that it's due to the 390X having twice the ram crossfire simply does not work correctly. This is coming from someone who watched the utilization of his 2 290s on the logitech keyboard screen like a hawk during games. I should never see gpu 2 (290) at 100% and gpu 1 (390X) at 30% and rarely rise above 50% even in fire strike. Crossfire does work, but not properly, and hopefully MSI can straighten this out for me as I either need them to take my 290 and give me another 390X or take my 390X and give me a 290

Mysticking32 · Sep 6, 2015

Obviously the scenario where they give you another 390x is the best lol. Are you guaranteed they'll give you one though?

kansasboy001 · Sep 6, 2015

No I'm not, but I am going to raise hell till they do. I rma ed my 290 thinking I'd be getting another 290, they knew I had 2 in crossfire, and they sent me a 390X which doesn't work correctly with the 290. They need to do something for me

Mysticking32 · Sep 6, 2015

I actually sent my r9 280x back and bought a 390x. Two days ago they offered to upgrade me to the 390x. Of course I took it. But now I have to invest in a new psu to crossfire it. But I was very shocked they did that upgrade at all. Very impressed.

If I were you I'd try to rma the r9 290 but if that doesn't work just sell it and keep the 390x. Maybe save up for another one?

kansasboy001 · Sep 6, 2015

I'm going to just call msi Tuesday and honestly talk to them and tell them what's happening and that I want them to exchange my 290 for a 390 or 390X and see how it goes, before I even opened the 390X they sent me I called them to make sure it would work correctly in crossfire, as I thought the memory would be an issue. I really think I have a case with them and they should take care of me, if not I will sell my 290 and get a used 390x, or maybe I'll sell the 390X and make me $200

kansasboy001 · Sep 8, 2015

Well msi agreed to replace my 290 with a 390X no problem. I will always buy msi from now on. Especially since I bought the 290s used for $200 a piece.

givmedew · Nov 26, 2015

Mysticking32 :

Hey so what happened with this?

The X def doesn't matter on the 290... but maybe the ram does. I have (2) R9 290X and one of them was an unlock (a 290x packaged as a 290 then unlocked by running the 290x bios). Before I unlocked it I had no issue running it in cross-fire.

Also I have run the modified 390 bios floating around for the 290X on one card with the other card running the normal 290X and also tried it with the 290 profile. All worked BUT both cards are 4GB.

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Crossfire r9 390x 8gb and r9 290 4gb

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