GeForce GT 440 3GB vs Radeon HD 4650 512MB

Intro

Compare those specs to the Radeon HD 4650 512MB, which comes with a core clock frequency of 600 MHz and a DDR2 memory frequency of 500 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GT 440 3GB		56 Watts
	Difference: 1 Watts (2%)

Memory Bandwidth

The GeForce GT 440 3GB, in theory, should perform a lot faster than the Radeon HD 4650 512MB in general. (explain)

GeForce GT 440 3GB		43200 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 27200 (170%)

Texel Rate

The Radeon HD 4650 512MB is quite a bit (approximately 35%) faster with regards to anisotropic filtering than the GeForce GT 440 3GB. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
GeForce GT 440 3GB		14256 Mtexels/sec
	Difference: 4944 (35%)

Pixel Rate

The GeForce GT 440 3GB will be quite a bit (about 197%) faster with regards to FSAA than the Radeon HD 4650 512MB, and also should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GT 440 3GB		14256 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 9456 (197%)

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 (counted in megabytes per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a 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 worked out by multiplying the amount of colour ROPs by the clock speed of the card. 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.