Sapphire HD 7790 Dual-X OC Edition Graphic Card Review

  1. Introduction
  2. Packaging and Specification
  3. Closer Look Part 1
  4. Closer Look Part 2
  5. Test bench and testing methodology
  6. Futuremark Benchmarks
  7. Cinebench Benchmarks
  8. Unigine Benchmark
  9. Battlefield 3 (Operation Swordfish) Benchmark
  10. Dirt 3 DX11 Benchmark
  11. Sleeping Dogs DX11 Benchmark
  12. Passion Leads Army (Unreal 3 Engine) Benchmark
  13. Metro 2033 Benchmark
  14. Resident Evil Benchmarks
  15. Sniper Elite V2 DX11 Benchmark
  16. Conclusion

AMD sent Sapphire Dual-X OC card which uses their AMD HD 7790 GPU. The GPU is based on 28nm Bonaire processor with 1000MHz clock speed, 896 unified shaders and rated at 80w peak power consumption.

HD 7790 has 40% more stream processors and texture units in comparison with 7770 GHz Edition, along with more memory clock and bandwidth. The comparison of the specification of the 7790 with couple of more AMD HD 7000 series are as follows:

HD 7750HD 7770 GHz EditionHD 7790
Transistors1.5 billion1.5 billion2.08 billion
Engine ClockUp to 900 MHz1 GHz1 GHz
Primitive Rate1 prim / clk1 prim / clk2 prim / clk
Stream Processors512640896
Compute PerformanceUp to 922 GFLOPS1.28 TFLOPS1.79 TFLOPS
Texture Units324056
Texture FillrateUp to 28.8 GT/s40.0 GT/s56.0 GT/s
Pixel FillrateUp to 14.4 GP/s16.0 GP/s16.0 GP/s
Memory Bit-Interface128-bit128-bit128-bit
Memory Clock / Data Rate4.5 Gbps4.5 Gbps6.0Gbps
Memory Bandwidth72 GB/s72 GB/s96.0 GB/s
Typical Board Power~55W~80W~85W
AMD ZeroCore Power<3W<3W<3W

AMD aims their HD 7790 video cards against Nvidia GTX 650 Ti series card. AMD pairs 1GB GDDR5, whereas Nvidia uses 2GB GDDR5. For those who have been reading graphic card reviews for a long time, you know that doubling the memory compared to the rival’s counterpart at times will, may or may not have any effect. It all depends on the architecture and the core, presets, resolution… list goes on.


The non-reference however, is also another story. Sapphire does have a 2GB OC card variant, but the one which we’ll be taking a look at is the Sapphire HD 7790 1GB Dual-X OC card with 1GB GDDR5, with the GPU clock speed at 1075 MHz with a memory clocked at 1600 MHz.

This card has 175 MHz boost on the core’s clock frequency over the stock edition. The paper difference between the stock and this version of the card is the bumped frequency for the core clock and memory clock. If you’re wondering, the stock version uses 1500MHz memory clock speed.


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