GeForce GT 240 GDDR5 1GB vs Radeon HD 4850 2GB

Intro

Compare all that to the Radeon HD 4850 2GB, which has a clock speed of 625 MHz and a GDDR4 memory speed of 993 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is made up of 800(160x5) SPUs, 40 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 4850 2GB		110 Watts
	Difference: 40 Watts (57%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 2GB is 17% quicker than the GeForce GT 240 GDDR5 1GB overall, because of its greater data rate. (explain)

Radeon HD 4850 2GB		63552 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 9152 (17%)

Texel Rate

The Radeon HD 4850 2GB will be much (more or less 42%) faster with regards to AF than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 7400 (42%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4850 2GB is superior to the GeForce GT 240 GDDR5 1GB, and very much so. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 5600 (127%)

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 max amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends 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.