Hey ya'll,
I just bought a 5870 for cheap with plans to CrossFire it with my 5850. However, when in Skyrim looking down at the town from Dragonsreach, my results are as follows:
5850 Alone: 20 fps
5870 Alone: 22 fps
5850 + 5870 Crossfire: 18 fps
The rest of my computer's specs are as follows:
Windows 7 64 bit
OCZ Gold 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000)
MSI 790FX-GD70 AM3 AMD 790FX ATX AMD Motherboard
AMD Phenom II X4 550 Black Edition Callisto 3.1GHz Socket AM3 80W Quad-Core Processor HDZ550WFGIBOX
Thermaltake TR2 W0388RU 600W ATX 12V v2.2 Power Supply
1TB 5400 RPM HD SATA
64GB SSD Samsung 830 Series SATA II/III
Latest AMD Catalyst and CAP drivers installed
The 5850 and 5870 are plugged into the PCI-E 2.0 16x slots and bridged with the crossfire cable.
In the AMD Control Center, it shows that CrossFireX is enabled. GPU-Z shows that both GPU's are being used.
Other points of interest:
Running 3DMark Vantage on the first animation:
Crossfire Disabled, running off just the 5870 gets 4900 frames
Crossfire Enabled gets 6100 frames
(Crossfired numbers are consistently higher, but not by much)
Running Mafia 2 benchmark with all settings on highest except for PhysX:
Crossfire Disabled, running off just the 5870 gets 49.7 fps avg (Also, GPU-Z shows 96% GPU usage and 50% CPU usage)
Crossfire Enabled: 61.2 FPS (GPU-Z shows GPU usage maxing out at around 70% for both cards, and GPU usage around 70% as well)
(Crossfired numbers are consistently higher, but again not by much)
In Batman Arkham City, benchmarks are identical for both with all settings on highest. (Around 62 fps)
Performance decreases (by 2-4 frames generally) in Skyrim with Crossfire enabled.
I'm stuck as to why I'm not getting more of a performance increase, and why performance is actually taking a hit to some games.
The only thing I can think of is that my PSU Wattage isn't enough... but then wouldn't that just result in my PC shutting down if it wasn't able to draw enough power from the PSU? 600W is the recommended for crossfiring the 5800's on AMD's site.
Thanks for any help, insight, and input!
I just bought a 5870 for cheap with plans to CrossFire it with my 5850. However, when in Skyrim looking down at the town from Dragonsreach, my results are as follows:
5850 Alone: 20 fps
5870 Alone: 22 fps
5850 + 5870 Crossfire: 18 fps
The rest of my computer's specs are as follows:
Windows 7 64 bit
OCZ Gold 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000)
MSI 790FX-GD70 AM3 AMD 790FX ATX AMD Motherboard
AMD Phenom II X4 550 Black Edition Callisto 3.1GHz Socket AM3 80W Quad-Core Processor HDZ550WFGIBOX
Thermaltake TR2 W0388RU 600W ATX 12V v2.2 Power Supply
1TB 5400 RPM HD SATA
64GB SSD Samsung 830 Series SATA II/III
Latest AMD Catalyst and CAP drivers installed
The 5850 and 5870 are plugged into the PCI-E 2.0 16x slots and bridged with the crossfire cable.
In the AMD Control Center, it shows that CrossFireX is enabled. GPU-Z shows that both GPU's are being used.
Other points of interest:
Running 3DMark Vantage on the first animation:
Crossfire Disabled, running off just the 5870 gets 4900 frames
Crossfire Enabled gets 6100 frames
(Crossfired numbers are consistently higher, but not by much)
Running Mafia 2 benchmark with all settings on highest except for PhysX:
Crossfire Disabled, running off just the 5870 gets 49.7 fps avg (Also, GPU-Z shows 96% GPU usage and 50% CPU usage)
Crossfire Enabled: 61.2 FPS (GPU-Z shows GPU usage maxing out at around 70% for both cards, and GPU usage around 70% as well)
(Crossfired numbers are consistently higher, but again not by much)
In Batman Arkham City, benchmarks are identical for both with all settings on highest. (Around 62 fps)
Performance decreases (by 2-4 frames generally) in Skyrim with Crossfire enabled.
I'm stuck as to why I'm not getting more of a performance increase, and why performance is actually taking a hit to some games.
The only thing I can think of is that my PSU Wattage isn't enough... but then wouldn't that just result in my PC shutting down if it wasn't able to draw enough power from the PSU? 600W is the recommended for crossfiring the 5800's on AMD's site.
Thanks for any help, insight, and input!