Radeon HD 6950 2GB vs Radeon R7 250

Intro

Compare that to the Radeon R7 250, which has a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 135 Watts (208%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6950 2GB should theoretically be much better than the Radeon R7 250 overall. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon R7 250		73600 MB/sec
	Difference: 86400 (117%)

Texel Rate

The Radeon HD 6950 2GB should be a lot (more or less 193%) better at anisotropic filtering than the Radeon R7 250. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 46400 (193%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6950 2GB is the winner, by far. (explain)

Radeon HD 6950 2GB		25600 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 17600 (220%)

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: Bandwidth is the largest amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.