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GeForce GT 640 DDR3 vs Radeon HD 6850

Intro

The GeForce GT 640 DDR3 features a core clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 6850, which has a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is made up of 960 SPUs, 48 TAUs, and 32 ROPs.

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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

The Radeon HD 6850 should in theory perform a lot 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 will be much (approximately 29%) faster with regards to 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

If running with a high screen resolution is important to you, then the Radeon HD 6850 is the winner, by far. (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

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 6850

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GT 640 DDR3 Radeon HD 6850
Manufacturer nVidia AMD
Year June 2012 October 2010
Code Name GK107 Barts Pro
Memory 2048 MB 1024 MB
Core Speed 900 MHz 775 MHz
Memory Speed 3564 MHz 4000 MHz
Power (Max TDP) 65 watts 127 watts
Bandwidth 57024 MB/sec 128000 MB/sec
Texel Rate 28800 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 384 960
Texture Mapping Units 32 48
Render Output Units 16 32
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 1700 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 6850

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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