XFX HD 7870 and 7850 Double Dissipation Reviewtacohunter52 - May 7, 2012
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Testing of both the XFX Black Edition Double Dissipation Radeon HD 7870 and 7850 will consist of running them and the comparison cards through the OverclockersClub.com suite of games and synthetic benchmarks. This will test the performance of the video card against many popular competitors. Comparisons will be made to cards of equal and greater capabilities to show where they each fall on the performance ladder, using games that are some of today's newest and most popular titles which will provide an idea of how the cards perform relative to each other.
The system specifications remain the same throughout the testing. No adjustment will be made to the respective control panels during the testing with the exception of the 3DMark Vantage testing, where PhysX will be disabled in the NVIDIA control panel, if applicable. The card will first be tested at stock speeds and then overclocked to see the following effects. The cards will be placed in order from highest to lowest performing in the graphs to show where they fall by comparison. The drivers used are the 12.3 Catalyst drivers for AMD-based cards, with the exception being the new HD 7800 series that have been tested with the latest AMD press release performance driver driver. The 290.53 drivers for NVIDIA-based cards are used for the testing.
- Processors: Core i7 2600K @ 4.4 GHz 100 x 44
- CPU Cooling: Corsair Hydro Series H100
- Motherboard: Gigabyte Z68AP-D3
- Memory: Mushkin 991996 Redline PC3-17000 9-11-10-28 8 GB
- Video Card: XFX Black Edition HD 7870 Double Dissipation, HD 7850
- Power Supply: Corsair AX1200
- Hard Drive: 1 x Seagate 1TB SATA
- Optical Drive: Lite-On DVD-RW
- Case: Corsair Graphite Series 600T
- OS: Windows 7 Professional 64-bit
Comparison Video Cards:
- XFX HD 7870 Black Edition 2 GB Core 1241MHz Memory 1328MHz
- XFX HD 7850 Black Edition 2 GB Core 1050MHz Memory 1450MHz
To start off, let's talk about overclocking the XFX HD Double Dissipation 7850. Overclocking this card was extremely easy because it was able to max out MSI's Afterburner in both the Core and Memory clocks. I started by increasing the frequencies in 5MHz increments, but soon got to a point where I couldn't go any higher. As for the XFX HD Double Dissipation 7870, well, we weren't so lucky. Again I increased the frequencies in 5MHz increments. However around a core clock of 1245 I encountered instabilities. I then lowered the core clock in increments of 1MHz until I could successfully run through the entire OCC benchmarking suite. This came to a final clock of 1241MHz. I then did the same thing for the memory, which resulted in a final clock of 1328MHz. Even though the card wasn't able to max out MSI's afterburner, it still gave us a fairly impressive overclock!
Maximum Clock Speeds:
Testing for the maximum clock speed consists of looping Unigine 2.5 for 30 minutes each to see where the clock speeds fails when pushed. If the clock speed adjustment fails, then the clock speeds and tests are rerun until they pass a full hour of testing.
- Gaming Tests:
- Metro 2033
- Batman: Arkham City
- Battlefield 3
- Unigine Heaven Benchmark 2.5
- DiRT 3
- Mafia II
- 3DMark 11
- Power Consumption