GeForce GT 640 DDR3 vs Radeon HD 6850

Intro

Compare those specs to the Radeon HD 6850, which makes use of a 40 nm design. AMD has set the core frequency at 775 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this card. It features 960 SPUs as well as 48 Texture Address Units and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6850		2395 points
GeForce GT 640 DDR3		1560 points
	Difference: 835 (54%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 6850		127 Watts
	Difference: 62 Watts (95%)

Memory Bandwidth

Theoretically, the Radeon HD 6850 should be quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 6850		128000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 70976 (124%)

Texel Rate

The Radeon HD 6850 is much (more or less 29%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 6850		37200 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 8400 (29%)

Pixel Rate

The Radeon HD 6850 will be quite a bit (approximately 72%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 6850		24800 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 10400 (72%)

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 data (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video 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 most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.