GeForce GT 240 GDDR5 1GB vs Radeon HD 4870 X2

Intro

Compare all of that to the Radeon HD 4870 X2, which features GPU core speed of 750 MHz, and 1024 MB of GDDR5 memory running at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 280 Watts (400%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 is 324% quicker than the GeForce GT 240 GDDR5 1GB overall, due to its greater data rate. (explain)

Radeon HD 4870 X2		230400 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 176000 (324%)

Texel Rate

The Radeon HD 4870 X2 will be a lot (more or less 241%) more effective at texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 42400 (241%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4870 X2 is the winner, and very much so. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 19600 (445%)

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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.