Crysis 3 with 4x7970's in crossfire with 3x30 dells

[FiLeZz]

Well I installed crysis 3 today and was shocked how poorly it uses Crossfire.

Need all 4 cards to work to push my resolution @7680x1600

With only 2 cards the gpu loads are 100% each

With 3 card the gpu load also drops to about 40-50%

When I have 4 cards in crossfire I only get 40-50 % load on the cards.

So my performance is the same with 2 cards 3 or 4 video cards..Wish I could find a fix.

I overclocked my 3930k to 4.8ghz and the fps did not increase nor gpu loads. so its not a cpu bottleneck.

I read that crisis 2 had the same broken scaling for crossfire.

 

[CurrentlyPissed]

I could never myself invest in anything past 2 cards. I could see the benefit of 3. But 4? It seems like they never work.

 

[VulgarDisplay]

http://www.youtube.com/watch?v=_hcuYiqib9I
Have you seen or tried this? It's a tweak for the CPU that worked to give Quad SLi more performance. I'm guessing it would have some benefit for Xfire also.

 

[Final8ty]

I could never myself invest in anything past 2 cards. I could see the benefit of 3. But 4? It seems like they never work.

4 GPUs work for me 95% of the time but quadfire 7 series does seem to have a lot of issues still to sort out.

 

[Jacky60]

My 6990 quadfire yields similar results, at 1920x1200 I get 50% usage on each GPU, when I drop to 1024x768 I get 50% usage on each GPU. Seems the game or profiles are borked.

 

[Shmee]

Latest drivers?

 

[Jacky60]

Catalyst 13.2 Beta 6

 

[FiLeZz]

had 13.2 6 and now on 13.2 7

 

[guskline]

Well I installed crysis 3 today and was shocked how poorly it uses Crossfire.

Need all 4 cards to work to push my resolution @7680x1600

With only 2 cards the gpu loads are 100% each

With 3 card the gpu load also drops to about 40-50%

When I have 4 cards in crossfire I only get 40-50 % load on the cards.

So my performance is the same with 2 cards 3 or 4 video cards..Wish I could find a fix. overclocked my 3930k to 4.8ghz and the fps did not increase nor gpu loads. so its not a cpu bottleneck.

I read that crisis 2 had the same broken scaling for crossfire.

Wow! What PSU are you using for a 4 7970 rig setup?

 

[FiLeZz]

Wow! What PSU are you using for a 4 7970 rig setup?

Corsair ax1200

 

[-Slacker-]

Could it be a vram bottleneck? The game needs more than 2gb at 2560x1600 at maximum settings and you are running 3 monitors, although I am assuming that you have 3gb models and are attempting to run VHQ...

...If that's the case, you could try and see what happens when you reduce the vram load by lowering the settings for textures, antialiasing and resolution.

 

[AdamK47]

Corsair ax1200

Really? I had three 7970s with an AX1200 and thought I was at my limit there.

 

[Eureka]

Really? I had three 7970s with an AX1200 and thought I was at my limit there.

Did you ever measure it? Average system power with just a single non-overclocked 7970 GHz is still around 350W... each 7970 should only add another 200W (it has a powertune limit of 250W).

Assuming you're not stress-testing, a 1200W PSU should be able to drive 4 7970s.

 

[brianmanahan]

sell the 7970s and buy 4 titans?

rofl thats like 4000$

 

[FiLeZz]

I lowered AF AA and switched to low texture detail, still gpus only at a 50 to 60% load.. Broke broke broke..

 

[VulgarDisplay]

http://www.youtube.com/watch?v=_hcuYiqib9I
Have you seen or tried this? It's a tweak for the CPU that worked to give Quad SLi more performance. I'm guessing it would have some benefit for Xfire also.

Did you try this?

 

[FiLeZz]

Did you try this?

Yea I tried it.. No change.. Looks like this is ment for a cpu bottleneck. great fix if that's what I had but I rolling with 6 cores clocked high.

 

[UaVaj]

until software utilization catches up.

software utilization to use all 6 cpu core.
and
software utilization to use all 4 gpu core.

it gonna suck until then.

 

[3DVagabond]

until software utilization catches up.

software utilization to use all 6 cpu core.
and
software utilization to use all 4 gpu core.

it gonna suck until then.

Apparently, Crysis 3 does use extra threads/cores quite well. You can see the lower clocked 3930/3960 beating the 3770. This looks like scaling beyond 8 threads.

With the next Playstation using an AMD 8core APU, there's the opportunity for this to catch on. :crossedfingers: