GeForce GT 240 GDDR5 1GB vs Radeon HD 4830 512MB

Intro

Compare those specs to the Radeon HD 4830 512MB, which has a core clock speed of 575 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 25 Watts (36%)

Memory Bandwidth

Theoretically, the Radeon HD 4830 512MB should be a little bit faster than the GeForce GT 240 GDDR5 1GB overall. (explain)

Radeon HD 4830 512MB		57600 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 3200 (6%)

Texel Rate

The Radeon HD 4830 512MB should be a little bit (about 5%) better at texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4830 512MB		18400 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 800 (5%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4830 512MB is the winner, by far. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 4800 (109%)

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 largest amount of data (counted in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.