GeForce GTX 750 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750		55 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 135 Watts (245%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 1GB should theoretically be quite a bit better than the GeForce GTX 750 overall. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce GTX 750		80000 MB/sec
	Difference: 44800 (56%)

Texel Rate

The Radeon HD 4890 1GB will be quite a bit (more or less 23%) better at AF than the GeForce GTX 750. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
GeForce GTX 750		32640 Mtexels/sec
	Difference: 7360 (23%)

Pixel Rate

The GeForce GTX 750 is a bit (about 2%) better at anti-aliasing than the Radeon HD 4890 1GB, and also able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 750		16320 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 320 (2%)

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 max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher 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 chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.