GeForce GT 240 GDDR5 vs Radeon HD 6850

Intro

Compare all of that to the Radeon HD 6850, which has GPU core speed of 775 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also is made up of 960 Stream Processors, 48 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 6850		127 Watts
	Difference: 57 Watts (81%)

Memory Bandwidth

The Radeon HD 6850 should in theory perform a lot faster than the GeForce GT 240 GDDR5 overall. (explain)

Radeon HD 6850		128000 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 73600 (135%)

Texel Rate

The Radeon HD 6850 will be quite a bit (approximately 111%) faster with regards to texture filtering than the GeForce GT 240 GDDR5. (explain)

Radeon HD 6850		37200 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 19600 (111%)

Pixel Rate

The Radeon HD 6850 will be quite a bit (more or less 464%) better at full screen anti-aliasing than the GeForce GT 240 GDDR5, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6850		24800 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 20400 (464%)

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 data (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 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 better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.