GeForce GT 640 DDR3 vs Radeon HD 6870

Intro

Compare all of that to the Radeon HD 6870, which features a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It features 1120 SPUs, 56 TAUs, 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 6870		2870 points
GeForce GT 640 DDR3		1560 points
	Difference: 1310 (84%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 6870		151 Watts
	Difference: 86 Watts (132%)

Memory Bandwidth

In theory, the Radeon HD 6870 will be 136% quicker than the GeForce GT 640 DDR3 in general, because of its higher data rate. (explain)

Radeon HD 6870		134400 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 77376 (136%)

Texel Rate

The Radeon HD 6870 is quite a bit (more or less 75%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 6870		50400 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 21600 (75%)

Pixel Rate

The Radeon HD 6870 is much (more or less 100%) more effective at anti-aliasing than the GeForce GT 640 DDR3, and should be able to handle higher resolutions more effectively. (explain)

Radeon HD 6870		28800 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 14400 (100%)

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 information (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.