GeForce GTX 750 vs Radeon HD 4870 512MB

Intro

Compare those specifications to the Radeon HD 4870 512MB, which comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750		55 Watts
Radeon HD 4870 512MB		150 Watts
	Difference: 95 Watts (173%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 512MB will be 44% quicker than the GeForce GTX 750 in general, due to its higher data rate. (explain)

Radeon HD 4870 512MB		115200 MB/sec
GeForce GTX 750		80000 MB/sec
	Difference: 35200 (44%)

Texel Rate

The GeForce GTX 750 should be a small bit (approximately 9%) faster with regards to texture filtering than the Radeon HD 4870 512MB. (explain)

GeForce GTX 750		32640 Mtexels/sec
Radeon HD 4870 512MB		30000 Mtexels/sec
	Difference: 2640 (9%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 750 is a better choice, by a large margin. (explain)

GeForce GTX 750		16320 Mpixels/sec
Radeon HD 4870 512MB		12000 Mpixels/sec
	Difference: 4320 (36%)

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 information (in units of MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.