Someone Interpret These Results Please! HELP!

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Dubyah Bush

Dubyah Bush

Honorable
Jan 14, 2014
47
0
10,540
Unigune Heaven 1440p Ultra Average FPS
FX-8350 4.0Ghz (4.2 OC)
Sapphire 8GB 390x (OC by 6%)
Sapphire 8GB 290x (OC by 8%)

Crossfire with cpu and gpu overclock-67.6
Crossfire with cpu overclock stock gpu-63.7
Crossfire with cpu stock overclock gpu-67.2
Crossfire with all stock-36.6

Only 390x cpu and gpu overclock-37.7
Only 390x cpu overclock stock gpu-36.1
Only 390x cpu stock overclock gpu-37.7
Only 390x all stock-37.1

So, what does this mean? I feel like I should be getting better performance in crossfire, but there is a difference. What confuses me the most is the result with everything at stock. Is it because the GPU's aren't playing nice? My processor?

This is my problem. I am going to be getting a 4k monitor soon and I want to get stable and 30+fps on Ultra settings. I am maybe going to get an i7 5660k, but I only want to do so if the 8350 is causing my problems, but when it's at stock and the graphics cards are overclocked, it runs fine. Is it the 8350, or are the 290x and 390x just not cross firing well together?
 
Solution
azca
maybe because these are different gpus (not identical) you need to syncronize the gpu clocks using afterburner to enable crossfire; you can also try doing OC for both gpus using AMD overdrive and see if that fixes the issue
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Dubyah Bush

Dubyah Bush

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Jan 14, 2014
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10,540


I just don't understand why it runs like crap at stock. If my cpu and both cards are at stock I get LESS fps than the 390x by itself.
 
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blazorthon

Glorious
Sep 24, 2010
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Did you test at each configuration multiple times? Sometimes you get an outlier because of one reason or another and if you test again, it doesn't happen again. For example, the computer may have tried doing something else in the background and accidentally caused a bottleneck during the test.
 
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Dubyah Bush

Dubyah Bush

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Jan 14, 2014
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10,540

This time with cpu overclocked, stock graphics cards I averaged 51.7 when before I had 67.2
 
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Dubyah Bush

Dubyah Bush

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Jan 14, 2014
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I have run it multiple times with the same results. When everything is at stock, I get really bad frame rates. I'm running each run under the same settings at the same resolution. I'm only changing from stock at one card, to crossfire two cards (and when I OC it is the same OC everytime) I also close steam, avast, etc. etc.
 
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blazorthon

Glorious
Sep 24, 2010
14,022
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43,265
Given that your overclocks are pretty small overclocks, the performance increase from overclocking is not what is causing this. I'd guess that something is throttling when in Crossfire at stock and the overclock overrides whatever is causing throttling. For example, if your overclocks cause more aggressive fan speeds then maybe you were getting thermal throttling at stock.

Just a guess. Doing what azca said may help determine if this is what is happening or if the problem is something else.
 
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Dubyah Bush

Dubyah Bush

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Jan 14, 2014
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Alright, apparently at all stock the 290x isn't being used at all. It's at 0 percent usage. It shows up in crimson, msi, Windows, etc. But it isn't being used...
 
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azca

azca

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Mar 16, 2006
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maybe because these are different gpus (not identical) you need to syncronize the gpu clocks using afterburner to enable crossfire; you can also try doing OC for both gpus using AMD overdrive and see if that fixes the issue
 
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Solution
Dubyah Bush

Dubyah Bush

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Jan 14, 2014
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10,540


Gotcha, that explains it. The clocks aren't synced up exactly (memory is) but the system doesn't seem to utilize the card unless the 290x has some sort of overclock. I have 3 more questions an then i'll leave you alone :)
1. If the clocks don't match up, does it affect performance, why does it even work? I thought the primary card would down clock to the secondary, but that doesn't seem to be the case.
2. If I am getting those frame rates now, what would you think I would get at 4k ultra. Would I be better off buying a single fury x or 980ti?
3. I am planning on upgrading to dd4 ram and an intel i5 5660k, would it make a difference?
Thanks!
 
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azca

azca

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Mar 16, 2006
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1. it would be better if you set the gpu and ram clocks the same for both gpus
2. for games that support crossfire, these 2 cards are faster than any single gpu card; but some games don't support crossfire at all, so a Fury or 980ti will give you more FPS -> fix buy a freesync monitor so fps won't matter much, it will still be smooth gameplay
3. keep the system the same; just a buy a freesync monitor



 
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blazorthon

Glorious
Sep 24, 2010
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43,265
The primary should downclock, but it might not happen when the two cards aren't the same model. Crossfire supports it anyway and it usually works, but you might be experiencing an issue related to them technically being considered two different generations. Usually Crossfire doesn't really need to downclock one card because it can even work with two slightly different GPU configurations such as using a 290 with a 290X. However, it should be noted that synchronizing the GPU and memory performance of each card tends to yield the best Crossfire performance even when they work without it. This results in better performance stability with less stutter.

290X/390X Crossfire should beat out Fury and the 980 Ti in games that scale well in Crossfire.
 
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