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Here the differences between 6950HD and 6970HD. Flashing the BIOS of a 6950HD can make it a 6970HD but solely at your own risk. OverDrive is nothing but an overclocking utility. You can adjust the core/mem and also Power ie. go past the TDP value of 300W.
AMD Radeon™ HD 6970 GPU Feature Summary
Up to 880MHz Engine Clock
2GB GDDR5 Memory
1375MHz Memory Clock (5.5 Gbps GDDR5)
176 GB/s memory bandwidth (maximum)
2.7 TFLOPs Single Precision compute power
683 GFLOPs Double Precision compute power
TeraScale 3 Unified Processing Architecture
1536 Stream Processors
96 Texture Units
128 Z/Stencil ROP Units
32 Color ROP Units
Dual geometry and dual rendering engines
AMD Radeon™ HD 6950 GPU Feature Summary
Up to 800MHz Engine Clock
2GB GDDR5 Memory
1250MHz Memory Clock (5.0 Gbps GDDR5)
160 GB/s memory bandwidth (maximum)
2.25 TFLOPs Single Precision compute power
562.5 GFLOPs Double Precision compute power
Double slot form factor
TeraScale 3 Unified Processing Architecture
1408 Stream Processors
88 Texture Units
128 Z/Stencil ROP Units
32 Color ROP Units
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