GeForce GT 240 GDDR5 1GB vs Radeon HD 4790

Intro

Compare those specs to the Radeon HD 4790, which features a clock frequency of 600 MHz and a GDDR5 memory speed of 800 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4790 should theoretically be quite a bit superior to the GeForce GT 240 GDDR5 1GB overall. (explain)

Radeon HD 4790		102400 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 48000 (88%)

Texel Rate

The Radeon HD 4790 should be a bit (about 9%) faster with regards to anisotropic filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4790		19200 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 1600 (9%)

Pixel Rate

The Radeon HD 4790 is much (about 118%) faster with regards to full screen anti-aliasing than the GeForce GT 240 GDDR5 1GB, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 4790		9600 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 5200 (118%)

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 information (counted in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per 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 higher this number, the better the 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 maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.