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We have been hard at work for the last week reviewing many new 7000 series cards from AMD's leading partners. In this review today we are looking at the new Sapphire HD7850 Overclock Edition which features a custom cooling solution and out of the box clock speed enhancements.
Sapphire are AMD's largest and longest standing partner and their custom cooling solutions have been leading the way in the last year. We reviewed the HD7850 reference card on launch day and noted that it ran cool and quiet, so we have high expectations that this custom Sapphire card will improve dramatically on the reference design.
| Product | AMD HD7970 | AMD HD7950 | AMD HD7870 |
Sapphire HD7850 OC |
| Core Clock speed | 925mhz | 800mhz | 1000mhz | 860mhz (920mhz) |
| Transistors | 4.31 billion | 4.31 billion | 2.8 billion | 2.8 billion |
| Stream Processors | 2,048 | 1,792 | 1,280 | 1,024 |
| Compute Performance | 3.79 TFLOPS | 2.87 TFLOPS | 2.56 TFLOPS | 1.76 TFLOPS |
| Texture Units | 128 | 112 | 80 | 64 |
| Texture Fillrate | 118.4 GT/s | 89.6 GT/s | 80 GT/s | 55.0 GT/s |
| ROPs | 32 | 32 | 32 | 32 |
| Pixel Fillrate | 29.6 GP/s | 25.6 GP/s | 32.0 GP/s | 27.52 GP/s |
| Z/Stencil | 128 | 128 | 128 | 128 |
| Memory Type | 3GB GDDR5 | 3GB GDDR5 | 2GB GDDR5 | 2GB GDDR5 |
| Memory Clock | 1,375mhz | 1,250mhz | 1,200mhz | 1,200mhz (1250mhz) |
| Memory Data Rate | 5.5 GBps | 5.0 Gbps | 4.8 Gbps |
4.8 Gbps (5.0Gbps) |
| Memory Bandwidth | 264 GB/s | 240 GB/s | 153.6 GB/s | 153.6 GB/s |
Sapphire have overclocked both the core and the GDDR5 memory. The core clock speed is increased to 920mhz and the memory receives a 50mhz boost to 1,250mhz (5.0Gbps effective)
