GeForce GT 440 1.5GB vs Radeon HD 4850 X2 512MB

Intro

Compare those specifications to the Radeon HD 4850 X2 512MB, which has clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 1.5GB		56 Watts
Radeon HD 4850 X2 512MB		250 Watts
	Difference: 194 Watts (346%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB will be 194% quicker than the GeForce GT 440 1.5GB overall, due to its greater data rate. (explain)

Radeon HD 4850 X2 512MB		127104 MB/sec
GeForce GT 440 1.5GB		43200 MB/sec
	Difference: 83904 (194%)

Texel Rate

The Radeon HD 4850 X2 512MB should be much (more or less 251%) faster with regards to texture filtering than the GeForce GT 440 1.5GB. (explain)

Radeon HD 4850 X2 512MB		50000 Mtexels/sec
GeForce GT 440 1.5GB		14256 Mtexels/sec
	Difference: 35744 (251%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be much (about 40%) faster with regards to full screen anti-aliasing than the GeForce GT 440 1.5GB, and should be able to handle higher resolutions more effectively. (explain)

Radeon HD 4850 X2 512MB		20000 Mpixels/sec
GeForce GT 440 1.5GB		14256 Mpixels/sec
	Difference: 5744 (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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 texture map elements (texels) that are processed in one second. This number is calculated 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 card will be at 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 can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.