HD 7990 CrossfireX GPU Usage Problem

[T4cC0re]

Hi all,

 

i recently bought a 7990 for a damn good price (500€) but unfortunately i do not get full usage in every game. Mostly it is around 20-40% per GPU. One Exception: Tomb Raider! There i get full GPU Usage (90-99%) and the friggin high FPS.

 

I have tried everything... Disabling ULPS -> no difference, forcing another Crossfire profile -> no difference.

 

Tried different drivers.. Currently at the 13.11 Beta

 

Clocks of the GPUs are slightly overclocked -> 925MHz to 1GHz

PowerLimit is on +20%

 

I use Afterburner OSD to evaluate the Usage.

 

My System:
AMD FX 8120 @ 4 GHz

Crosshair V Formula

HD 7990 (PowerColor non-reference) This one

be quiet Power Zone 850W PSU

 

Please help me out  :blush:

[Levent]

thats mostly because of your cpu but dont expect it to run at %100 with all games.

[T4cC0re]

Is my CPU really THAT much of a Bottleneck? I cant imagine that by any means... But then why does it only crack up above 40% in Tomb Raider and no other game?

[Levent]

Is my CPU really THAT much of a Bottleneck? I cant imagine that by any means... But then why does it only crack up above 40% in Tomb Raider and no other game?

no i mean gpu usage dont expect it to run at %100 at every game because you might experience cpu bottleneck.

FX8120 is not that bad with new optimizations but still bit early to talk about it 

[Wolfur]

Is my CPU really THAT much of a Bottleneck? I cant imagine that by any means... But then why does it only crack up above 40% in Tomb Raider and no other game?

 

Yes, your CPU is that bad... you are trying to run a crossfire 7970 which both need a fast single thread on a CPU with one of the worst single thread we had for a while... even Phenoms had faster single thread, even really ooooold intel had faster single thread...

 

Get new CPU if you want to rip the benefits of crossfired 7970.

[kaneandtaker]

What games did you not get good GPU load? If they are non-demanding games like Source games then I wouldn't worry.

[T4cC0re]

Okay so would a i5 4440 be enough? Then i could upgrade to Intel Haswell including a Mobo (ASRock Fatal1ty H87) for < 250€

 

I guess i would go with that then if that CPU does not bottleneck.. Btw: how many PCIe lanes does 1150 have again?

[Levent]

Okay so would a i5 4440 be enough? Then i could upgrade to Intel Haswell including a Mobo (ASRock Fatal1ty H87) for < 250€

 

I guess i would go with that then if that CPU does not bottleneck.. Btw: how many PCIe lanes does 1150 have again?

H87 > 1 PCI-E 16X

Z87 > 1 PCI-E 3.0 16X or 2 PCI-E 3.0 8X or 1 PCI-E 3.0 ×8 + 2 PCI-E 3.0 ×4

not sure but it might be 24

[Popadookie]

This could also be attributed to a lack of crossfire profiles in the games you play. Tomb raider was developed alongside AMD so it definitely has a crossfire profile. What are the other games you play as they may not be compatible with crossfire?

[T4cC0re]

The other games are Dishonored, Crysis 3, Crysis 1, Battlefield 3, Metro, Skyrim etc. Most of them have a crossfire profile.. so i think i buy in the bottleneck.. just googled it and, yeah. AMD's pretty bad...

 

so what should i go with? a i5 4440, a i5 4670K or even a i7 4770k to not bottleneck the Card?

[Wolfur]

The other games are Dishonored, Crysis 3, Crysis 1, Battlefield 3, Metro, Skyrim etc. Most of them have a crossfire profile.. so i think i buy in the bottleneck.. just googled it and, yeah. AMD's pretty bad...

 

so what should i go with? a i5 4440, a i5 4670K or even a i7 4770k to not bottleneck the Card?

 

If you don't want to overclock, get:

 

Xeon e3-1230v3 - it's i7 4770 with different name and without integrated GPU.

+

some motherboard, like MSI H87-G43.

 

if you want to overclock, get i5 4670k or 4770k (depending on how much money you have, i7 will be a bit better)

+

Z87 motherboard for example MSI Z87-g45 Gaming or MSI Z87-G55.