HD 7970 Vs HD 6970 Vs 6990 Benchmark tests reviewed (All in one review)

I found out that all owners of the previous generation AMD Cayman HD 6970 want to know how their cards perform when comparing to the all new Radeon HD 7970, for that we've done this "All in one" article comparing the new world first 28nm based graphic card the Radeon HD 7970 from AMD (Advanced Micro Devices), with the previous generation Radeon HD 6950 and HD 6970 graphic cards.

So if you have a Radeon HD 6950 or HD 6970 and planing to move up to the next high-end graphic card HD 7970 one, then this article will give you a clear view of what you will get in term of performance, the release date of the HD 7970 and the HD 7950 is set to Jan 9 and Jan 31 respectively.
Now lets compare specifications of these graphic cards.

AMD Radeon HD 7970 Specifications

Video presentation and feature of the new generation AMD "Tahiti" based HD 7900 GPUs:

The AMD Radeon HD 7970 use the latest 28nm process technology featuring a lot of 2048 stream processors, a 384 bit GDDR5 memory bus and a total resulting a 3.79TFLOPs, using the new PCI-E 3.0 standard, GPU-Z specifications snap:

And the price start at $549 US SEP, and for sure this price will go down in the next few months.

AMD Radeon HD 6970 Specifications

Based on the Cayman GPU, the Radeon HD 6970 was the fastest single GPU in its line from AMD, specifications are good with 1536 Stream Processors and 256-bit GDDR5 memory interface using a PCI Express 2.1 x16 bus interface, bellow more:

•     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
•     High Speed 256-bit GDDR5 memory interface
•     PCI Express 2.1 x16 bus interface
•     “Eye-Definition” graphics
•         New and advanced architecture
•             Full DirectX® 11 support
•             Scalable geometry processing technology
•             Shader Model 5.0
•             DirectCompute 11
•             Dual advanced programmable hardware tessellation units
•             Accelerated multi-threading
•             HDR texture compression
•             Order-independent transparency

GPU-Z snap:

Reviews and Benchmark results

Bellow a comparison snapshots with review reference comparing the HD 7970 with the HD 6970 in addition to the dual GPU Radeon HD 6990 card and more.

3DMark 2011 scores (by TPU):Review

Overclocking performance benchmark(by techspot):
Review

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