Radeon HD 5750 512MB vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which comes with a clock frequency of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 24 Texture Address Units, 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 5750 512MB		86 Watts
	Difference: 21 Watts (32%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so theoretically they should perform the same. (explain)

Texel Rate

The Radeon HD 5750 512MB should be just a bit (more or less 5%) better at anisotropic filtering than the Radeon R7 250. (explain)

Radeon HD 5750 512MB		25200 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 1200 (5%)

Pixel Rate

The Radeon HD 5750 512MB will be much (more or less 40%) better at anti-aliasing than the Radeon R7 250, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 5750 512MB		11200 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 3200 (40%)

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 (counted in MB per second) that can be transported across the external memory interface in a second. The number is worked out 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 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.