Radeon HD 6950 vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core frequency at 723 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this specific card. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon HD 6950		200 Watts
	Difference: 75 Watts (60%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so theoretically they should have identical performance. (explain)

Texel Rate

The Radeon R9 M390X is much (approximately 31%) better at AF than the Radeon HD 6950. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 6950		70400 Mtexels/sec
	Difference: 22144 (31%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6950 is superior to the Radeon R9 M390X, not by a very large margin though. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 2464 (11%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.