GeForce GT 440 3GB vs Radeon HD 4890 2GB

Intro

Compare those specs to the Radeon HD 4890 2GB, which comes with clock speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 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 GT 440 3GB		56 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 134 Watts (239%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB should perform much faster than the GeForce GT 440 3GB overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GT 440 3GB		43200 MB/sec
	Difference: 81600 (189%)

Texel Rate

The Radeon HD 4890 2GB should be much (about 181%) better at anisotropic filtering than the GeForce GT 440 3GB. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce GT 440 3GB		14256 Mtexels/sec
	Difference: 25744 (181%)

Pixel Rate

The Radeon HD 4890 2GB is a little bit (about 12%) faster with regards to anti-aliasing than the GeForce GT 440 3GB, and also able to handle higher resolutions more effectively. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce GT 440 3GB		14256 Mpixels/sec
	Difference: 1744 (12%)

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 in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 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, HDR and high resolutions.

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

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