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GeForce GT 640 DDR3 vs Radeon HD 5970

Intro

The GeForce GT 640 DDR3 features core speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs along with 32 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 5970, which comes with a GPU core clock speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also features 1600 Stream Processors, 160 TAUs, and 64 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 5970 294 Watts
Difference: 229 Watts (352%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5970 should theoretically be a lot superior to the GeForce GT 640 DDR3 overall. (explain)

Radeon HD 5970 256000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 198976 (349%)

Texel Rate

The Radeon HD 5970 should be quite a bit (approximately 706%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 5970 232000 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 203200 (706%)

Pixel Rate

The Radeon HD 5970 will be much (more or less 544%) faster with regards to full screen anti-aliasing than the GeForce GT 640 DDR3, and also able to handle higher screen resolutions better. (explain)

Radeon HD 5970 92800 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 78400 (544%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 5970

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 5970
Manufacturer nVidia AMD
Year June 2012 November 2009
Code Name GK107 Hemlock XT
Memory 2048 MB 1024 MB (x2)
Core Speed 900 MHz 725 MHz (x2)
Memory Speed 3564 MHz 4000 MHz (x2)
Power (Max TDP) 65 watts 294 watts
Bandwidth 57024 MB/sec 256000 MB/sec
Texel Rate 28800 Mtexels/sec 232000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 92800 Mpixels/sec
Unified Shaders 384 1600 (x2)
Texture Mapping Units 32 160 (x2)
Render Output Units 16 64 (x2)
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit (x2)
Fab Process 28 nm 40 nm
Transistors 1300 million 2154 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 (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 5970

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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