GeForce GT 240 GDDR5 vs Radeon HD 4850 2GB

Intro

Compare all of that to the Radeon HD 4850 2GB, which has core clock speeds of 625 MHz on the GPU, and 993 MHz on the 2048 MB of GDDR4 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 40 Watts (57%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 2GB should in theory be just a bit better than the GeForce GT 240 GDDR5 in general. (explain)

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

Texel Rate

The Radeon HD 4850 2GB should be quite a bit (more or less 42%) better at AF than the GeForce GT 240 GDDR5. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4850 2GB is a better choice, by a large margin. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
GeForce GT 240 GDDR5		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 maximum amount of data (in units of MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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 - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.