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***official amd 83x0 overclocking thread***

Ok with one 7990 you get comparable results to mine. I think if you upped the core to 1100 we should be almost identical. Drivers will also play a role to a degree. Both the 8320 and the 3930k you posted above seem to bottleneck a pair of 7990s. Just the 3930k less so.
 
Installed some hot fixes and played around a bit more

250x20.5 = 5141MHz
2500 HT
2500 NB
2340MHz memory

Both 7990s are 1200 core and 1700 memory

Ran Firestrike
- single GPU http://www.3dmark.com/3dm/3017356?
- dual GPU http://www.3dmark.com/3dm/3017384?

11722 vs. 14587

Ran 3dmark 11
- single GPU http://www.3dmark.com/3dm11/8303642

Combined appears higher but not sure if thats just due to the higher clock speed rather than the hot fixes. I think Windows 8 uses the CPU better than Windows 7 but, as you've said, Windows 7 seems a lot more stable.

4.8Ghz vs 5.1GHz and Windows 7 only beats the combined score by 200 points.
 
Yes good results. Very similar 3d mark 11 score to mine so I think your system is absolutely fine. Your gpu scores are better. I agree win8 seems to utilise threads better I couldn't live with the instability of it. I can't understand the dual 7990 + 3930k fire strike score. Looking at my 3930k at 4.6 and 2 x 780s at stock, my graphics score is not as high as 2 7990s, physics about the same and my combined score is higher. I can only conclude the 3930k is severely bottlenecking 2 7990s.

Here are the fire strike links.

http://www.3dmark.com/fs/1973580
http://www.3dmark.com/3dm/1439194?

At this point I'll use this to see if we can get an answer:



Kaap may also be able to shed light on it.
 
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Hi all im trying to overclock my fx 8320
Ive left all the default settings as they are and overclocked by 100mhz but my temps jump from 32c to 42c running prime95 and the temps go upto 49c is this normal, im running a custom watercooling loop,
 
alex_123_fra said:
Yes good results. Very similar 3d mark 11 score to mine so I think your system is absolutely fine. Your gpu scores are better. I agree win8 seems to utilise threads better I couldn't live with the instability of it. I can't understand the dual 7990 + 3930k fire strike score. Looking at my 3930k at 4.6 and 2 x 780s at stock, my graphics score is not as high as 2 7990s, physics about the same and my combined score is higher. I can only conclude the 3930k is severely bottlenecking 2 7990s.

Here are the fire strike links.

http://www.3dmark.com/fs/1973580
http://www.3dmark.com/3dm/1439194?

At this point I'll use this to see if we can get an answer:

Kaap may also be able to shed light on it.
Click to expand...

Must be CPU related, your physics score is a darn sight better than mine.
 
JamesM said:
Must be CPU related, your physics score is a darn sight better than mine.
Click to expand...

Yes agree, if you compare the 3930k with the 8320, the former has a much better physics score. But if I compare my run with the 3930k @ 4.6GHz plus 2 x GTX780s at stock, the results show:

http://www.3dmark.com/fs/1973580
Total: 16,536
Gfx: 20,392
Physics: 16,418
Combined: 6,870

In this run with a 3930k @ 4.75GHz and 2 x 7990s (@1200MHz core) we have:

http://www.3dmark.com/3dm/1439194?

Total: 19,763
Gfx: 36,383
Physics: 16,440
Combined: 4,794

The issue I want to highlight is the poor combined score in the latter system. The latter system has around a 45% higher graphics score, but due to a poor combined score only manages around 3k more in the total score. This leads me to believe there is a bottleneck issue even with a 3930k, so no wonder the 8320 is having issues with 2 7990s.
 
Th0nt said:
Yep you have identified a bottleneck (which is to be expected on that power of GPU). Want me to lubricate Matt over to the thread? He's a stickler for leaving the GPU forum..
Click to expand...

If Matt has pearls of wisdom here, we would welcome them. Mainly to do with the 7990s. From a CPU perspective, Kaap may shed light as he knows firestrike inside out and has done runs with 4 290X cards I believe. Would be useful to see if that bottlenecks his 3970x/3930k/3960x. From this run of his in the firestrike bench thread, I would guess the answer is yes:

http://www.3dmark.com/fs/1623407
 
Hello boys where am i? :D

Yep classic cpu bottleneck im afraid. Even the most powerful 6 core cpu's can be a bit of a bottleneck at times in certain games at 1080P. An AMD cpu just ain't going to cut the mustard with such a powerful gpu setup as 2x7990's. As long as games play ok though. :)
 
alex_123_fra said:
If Matt has pearls of wisdom here, we would welcome them. Mainly to do with the 7990s. From a CPU perspective, Kaap may shed light as he knows firestrike inside out and has done runs with 4 290X cards I believe. Would be useful to see if that bottlenecks his 3970x/3930k/3960x. From this run of his in the firestrike bench thread, I would guess the answer is yes:

http://www.3dmark.com/fs/1623407
Click to expand...

The drivers I have got loaded at the moment are rubbish for Firestrike (the combined test is not good) but the graphics test works fine - the bit you are interested in.

I have run these off to show the difference CPU clockspeed makes to the graphics test.

4 x 290Xs @1200/1625 for all runs.

4930k @3.2

Graphics Score 35220

Link



4930k @4.0

Graphics Score 40371

Link



4930k @4.8

Graphics Score 43716

Link
 
alex_123_fra said:
Yes agree, if you compare the 3930k with the 8320, the former has a much better physics score. But if I compare my run with the 3930k @ 4.6GHz plus 2 x GTX780s at stock, the results show:

http://www.3dmark.com/fs/1973580
Total: 16,536
Gfx: 20,392
Physics: 16,418
Combined: 6,870

In this run with a 3930k @ 4.75GHz and 2 x 7990s (@1200MHz core) we have:

http://www.3dmark.com/3dm/1439194?

Total: 19,763
Gfx: 36,383
Physics: 16,440
Combined: 4,794

The issue I want to highlight is the poor combined score in the latter system. The latter system has around a 45% higher graphics score, but due to a poor combined score only manages around 3k more in the total score. This leads me to believe there is a bottleneck issue even with a 3930k, so no wonder the 8320 is having issues with 2 7990s.
Click to expand...

Have a go with the latest drivers and that may cure the combined score bottleneck.
 
Cheers guys.

Kaap do drivers effect the combined score that much?

I noticed Windows 8 gave better combined scores.

I presume there isn't really anything at the moment that can happily run quadfire without becoming a bottleneck. May just plod along and upgrade when something is released.

Was toying with the idea of a 4770k and swapping my systems around and although I would notice an improvement, I still don't think it's worth it.

Using Mantle I get better gaming performance but it's still a bit hit and miss for my cards, sometimes it works fine and other times it crashes.
 
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13.12 WHQL are the best benching drivers but for the latest games id use 14.4 WHQL. I think BF4 needs an update tbh as since they updated the server patch to R34 Mantle crashes for me as well.
 
It's more annoying seeing that the CPU usage is around 70-80% when gaming.

I would have thought this would be at 100% at least, allowing just a single GPU to do it's job but even running one 7990, GPU usage is 30-50%.

Although I prefer smooth frame rates over quality, running at medium/low settings to get over fps constantly is painful ha
 
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