Problem: My framerate in games with SLI enabled is at best the same as with a single card, and at worst 80% slower. For example, the Metro 2033 menu screen in sli runs at 4-5fps and takes 40s for the textures to even load, vs 25fps with a single card. This is just in the menu screen. Something is not right here.
Background: I've had SLI working fine for a few months and I know how to work profiles, so I don't think that's it. The drivers are the latest WHQL certified drivers and they worked fine for a while. I tried nvidia recommended settings, I tried force alternating frames, etc. Nothing I've tried has worked so I'm beginning to think there might be a hardware issue somewhere. Thinking it was a video card issue, I ran a single card in each pci-e port and stressed it for a while. Both cards checked out fine in single configuration, so I swapped their pci-e ports and ran sli again. Same abysmal SLI performance.
I recently moved and haven't done any gaming for the last few weeks. I've had power issues with this apartment (dimming lights, etc), but nothing more than that. Just a few days ago my pc started randomly rebooting, so I swapped the power supply and things seem to be ok (so far), except for the framerate issues. Is there any way to tell if the motherboard or gfx cards were damaged in some way? Like I said, both cards checked out fine in single configuration. I'm stumped.
System Info:
OS: Windows 7 Professional 64-bit
CPU: i5 2500k running at stock
Mobo: MSI P67A-GD65 (B3). Drivers up-to-date.
RAM: 8gb G.Skill Ripjaws DDR3 1600
GPU: MSI GTX560 Ti twin frozr II/OC x 2 (in SLI). nVidia drivers: 280.26 (most recent WHQL)
PSU: Corsair TX750
HD: WD 1TB caviar black as main, then two small archive HDs
DVD: generic DVD
Background: I've had SLI working fine for a few months and I know how to work profiles, so I don't think that's it. The drivers are the latest WHQL certified drivers and they worked fine for a while. I tried nvidia recommended settings, I tried force alternating frames, etc. Nothing I've tried has worked so I'm beginning to think there might be a hardware issue somewhere. Thinking it was a video card issue, I ran a single card in each pci-e port and stressed it for a while. Both cards checked out fine in single configuration, so I swapped their pci-e ports and ran sli again. Same abysmal SLI performance.
I recently moved and haven't done any gaming for the last few weeks. I've had power issues with this apartment (dimming lights, etc), but nothing more than that. Just a few days ago my pc started randomly rebooting, so I swapped the power supply and things seem to be ok (so far), except for the framerate issues. Is there any way to tell if the motherboard or gfx cards were damaged in some way? Like I said, both cards checked out fine in single configuration. I'm stumped.
System Info:
OS: Windows 7 Professional 64-bit
CPU: i5 2500k running at stock
Mobo: MSI P67A-GD65 (B3). Drivers up-to-date.
RAM: 8gb G.Skill Ripjaws DDR3 1600
GPU: MSI GTX560 Ti twin frozr II/OC x 2 (in SLI). nVidia drivers: 280.26 (most recent WHQL)
PSU: Corsair TX750
HD: WD 1TB caviar black as main, then two small archive HDs
DVD: generic DVD