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Today AMD release their new HD7750 and HD7770 series graphics cards targeting the mainstream enthusiast audience. In this review we analyse the Sapphire HD7770 1GHZ Overclock Edition which is supplied resplendent with custom cooling solution.
Sapphire are AMD's largest partner and over the last year they have been releasing some of the finest graphics cards known to man.
Their HD7950 Overclock Edition was one of the quietest performance cards we have tested to date, and could scale to over 1,200mhz.
In this state it was faster and quieter than the reference clocked HD7970 which cost £100 more.
Unlike VTX3D, Sapphire have taken the reference AMD cooler, ditched it and created their own. They are using a centralised, oversized fan on a blue PCB.
| Product | Sapphire HD7770 1GHZ OC Edition | AMD HD7770 1GHZ |
| Process | 28nm | 28nm |
| Transistors |
1.5 billion
|
1.5 billion |
| Engine Clock |
1,150 mhz
|
1000mhz |
| Stream Processors |
640
|
640 |
| Compute Performance | 1.28 TFLOPS | 1.28 TFLOPS |
| Texture Units | 40 | 40 |
| Texture Filrate | 40.0 GT/s | 40.0 GT/s |
| ROPs | 16 | 16 |
| Pixel Filrate | 16.0 GP/s | 16.0 GP/s |
| Z/Stencil | 64 | 64 |
| Memory Type | 1GB GDDR5 | 1GB GDDR5 |
| Memory Clock | 1,250mhz | 1,125mhz |
| Memory Data Rate | 5.0 Gbps | 4.5 Gbps |
| Memory Bandwidth | 72 GB/s | 72 GB/s |
Sapphire have overclocked the core from 1GHZ to 1,150mhz, and the memory from 1,125mhz (4.5Gbps effective) to 1,250mhz (5.0Gbps effective). Is this the best card on launch day?
