OEM Versus Retail?
AMD Raden HD8970 Specifications
http://www.amd.com/us/Documents/AMD_Radeon_HD_8970_Feature_Summary.pdf
AMD Radeon™ HD 8970 GHz Edition GPU Feature Summary (OEM)
1GHz Engine Clock (up to 1.05GHz with boost)
3GB GDDR5 Memory
1500MHz Memory Clock (6.0 Gbps GDDR5)
288GB/s memory bandwidth
4.3 TFLOPS Single Precision compute power
1.07 TFLOPS Double Precision compute power
GCN Architecture1
32 Compute Units (2048 Stream Processors)
128 Texture Units
128 Z/Stencil ROP Units
32 Color ROP Units
Dual geometry units
Dual Asynchronous Compute Engines (ACE)
AMD Radeon HD7970 GHz Edition Specifications
http://www.amd.com/US/PRODUCTS/DESKTOP/GRAPHICS/7000/7970GHZ/Pages/radeon-7970GHz.aspx
1GHz Engine Clock (up to 1.05GHz with boost)
3GB GDDR5 Memory
1500MHz Memory Clock (6.0 Gbps GDDR5)
288GB/s memory bandwidth
4.3 TFLOPS Single Precision compute power
1.01 TFLOPS Double Precision compute power
GCN Architecture
32 Compute Units (2048 Stream Processors)
128 Texture Units
128 Z/Stencil ROP Units
32 Color ROP Units
Dual geometry units
Dual Asynchronous Compute Engines (ACE)
(Reference AMD Radeon HD7970 Specifications)
http://www.amd.com/us/products/desktop/graphics/7000/7970/Pages/radeon-7970.aspx#/3
Up t 925MHz Engine Clock
3GB GDDR5 Memory
1375MHz Memory Clock (5.5Gbps GDDR5)
264GB/s memory bandwidth (maximum)
3.79 TFLOPS Single Precision compute power
947 GFLOPS Double Precision compute power
GCN Architecture
32 compute units (2048 Stream Processors)
128 Texture Units
128 Z/Stencil ROP Units
32 Color ROP Units
Dual Geometry Engines
Dual Asynchronous Compute Engines (ACE)
Based on what I'm seeing above, the only difference between the 7970 GHz Edition and the 8970 GHz Edition is the 8970 has 0.06 more TFLOPS. These aren't Mobile parts. That may be explained either as a typo by the person entering the information on their website, or they refined the core a "smidgen", at best.
Now...I understand companies rebadging products since I've seen it hundreds of times over the last 25+years, but I have never seen an instance where a product marketed as "Product A", an "Enthusiast" level product has X performance as an OEM part and the exact same make and model has 40% higher performance because it's marked as a "Retail" product, (even though it's the same model of product.)
That'd be the equivelant of selling a Bugatti Veyron SuperSport, capable of 258MPH, as an "OEM" version of the car while the exact same model of Bugatti Veyron SuperSport, now specified as a "Retail" version, suddenly now does 361MPH
This being the case, the "Retail" 8970 had better be shipping with a minimum of 500MHz faster Core and Memory if they expect to see a 40% improvement in performance...and if it
is shipping with 500MHz more on the core, can it, in all honesty, really be called the same "model" of video card?