Greetings my fellow high end gamers with an insatiable desire to max out every game on your system with little respect to cost. I am amongst you and have run into an issue moving from a single GPU setup to a SLI configuration and am looking for some help.
The Need
I play at 2560x1600 so I am unable to play some of the more recent games at max settings with a single GTX 580 (BF3, Skyrim, Batman AC). So I just splurged on a 2nd GTX 580 with the impression that I'll be able to max these games out and maintain playable frame rates.
The Problem
Once I had the 2nd card and the latest drivers installed I immediately pulled up BF3 to see what kind of performance boost I've received. To my suprise, my fps were virtually the same as with the single card at the same in game settings.
BF3 In-Game Settings
All ultra, v-sync off, motion blur off, no AA, SSAO
Single Card Performance Baseline (BF3)
GPU Temp - 65c
GPU Utilization - 99% (maxed - good)
CPU Utilization - 40-60% (not maxed - good)
FPS - 45-50 fps (very stable)
SLI Performance (BF3, same settings)
GPU Temp - 65c (GPU1), 60c (GPU2)
GPU Utilization - both cards jump around from 45-75% very erratically (no where near maxed - not good)
CPU Utilization - 40-60% (not maxed - good)
FPS - 50 fps average,with some eratic spikes (that probably coincide with the GPU utilization spikes)
My System Specs
i7 920 @ 3.2GHz
6 gig RAM, 1333MHz
GTX 580 1.5GB x 2
Mobo: Gigabyte EX58-UD4P
1000W PSU
Questions
1. Does anyone else play BF3 at 2560x1600 with GTX 580 1.5GB cards in SLI? If so, could you provide the type of fps you get and at what settings? Also any info on your system would be appreciated.
2. Is it possible that I did something wrong in setup that would cause low gpu utilization?
3. My first thought with low utilization is that my cpu must be bottlenecking. Highest it spikes is 75%, and seems to average around 60%, so that's not the case. Is it possible that the vram is bottlenecking? Is there any way I can check vram utilization? Can't seem to find an option for that in MSI Afterburner.
4. Could a faulty SLI bridge cause this? What kind of symptoms would you observe if you had a bad one? I am using an old SLI bridge that was laying loose in a box in my basement for over 2 years so I can't be certain of the condition. I don't have a 2nd sli bridge to test. When I get home tonight, I could remove the SLI bridge and see if I can observe any change in performance to determine if it is fully functional. If my system performs the same, I could reasonably conclude I may need a new bridge.
5. Any other ideas or thoughts? Kind of frustrating to spend so much money and observe virtually no gain in performance.
Thanks in advance for any ideas / suggestions!
The Need
I play at 2560x1600 so I am unable to play some of the more recent games at max settings with a single GTX 580 (BF3, Skyrim, Batman AC). So I just splurged on a 2nd GTX 580 with the impression that I'll be able to max these games out and maintain playable frame rates.
The Problem
Once I had the 2nd card and the latest drivers installed I immediately pulled up BF3 to see what kind of performance boost I've received. To my suprise, my fps were virtually the same as with the single card at the same in game settings.
BF3 In-Game Settings
All ultra, v-sync off, motion blur off, no AA, SSAO
Single Card Performance Baseline (BF3)
GPU Temp - 65c
GPU Utilization - 99% (maxed - good)
CPU Utilization - 40-60% (not maxed - good)
FPS - 45-50 fps (very stable)
SLI Performance (BF3, same settings)
GPU Temp - 65c (GPU1), 60c (GPU2)
GPU Utilization - both cards jump around from 45-75% very erratically (no where near maxed - not good)
CPU Utilization - 40-60% (not maxed - good)
FPS - 50 fps average,with some eratic spikes (that probably coincide with the GPU utilization spikes)
My System Specs
i7 920 @ 3.2GHz
6 gig RAM, 1333MHz
GTX 580 1.5GB x 2
Mobo: Gigabyte EX58-UD4P
1000W PSU
Questions
1. Does anyone else play BF3 at 2560x1600 with GTX 580 1.5GB cards in SLI? If so, could you provide the type of fps you get and at what settings? Also any info on your system would be appreciated.
2. Is it possible that I did something wrong in setup that would cause low gpu utilization?
3. My first thought with low utilization is that my cpu must be bottlenecking. Highest it spikes is 75%, and seems to average around 60%, so that's not the case. Is it possible that the vram is bottlenecking? Is there any way I can check vram utilization? Can't seem to find an option for that in MSI Afterburner.
4. Could a faulty SLI bridge cause this? What kind of symptoms would you observe if you had a bad one? I am using an old SLI bridge that was laying loose in a box in my basement for over 2 years so I can't be certain of the condition. I don't have a 2nd sli bridge to test. When I get home tonight, I could remove the SLI bridge and see if I can observe any change in performance to determine if it is fully functional. If my system performs the same, I could reasonably conclude I may need a new bridge.
5. Any other ideas or thoughts? Kind of frustrating to spend so much money and observe virtually no gain in performance.
Thanks in advance for any ideas / suggestions!