Radeon HD 7950 3GB vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1150 MHz through a 128-bit bus. It also is made up of 384 Stream Processors, 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 7950 3GB		200 Watts
	Difference: 135 Watts (208%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 3GB should be 226% quicker than the Radeon R7 250 in general, due to its higher bandwidth. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R7 250		73600 MB/sec
	Difference: 166400 (226%)

Texel Rate

The Radeon HD 7950 3GB will be quite a bit (about 273%) better at texture filtering than the Radeon R7 250. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 65600 (273%)

Pixel Rate

The Radeon HD 7950 3GB should be quite a bit (more or less 220%) more effective at AA than the Radeon R7 250, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7950 3GB		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 transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.