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GeForce GT 640 DDR3 vs Radeon HD 6990

Intro

The GeForce GT 640 DDR3 comes with a GPU core clock speed of 900 MHz, and the 2048 MB of DDR3 RAM runs at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 6990, which has GPU clock speed of 830 MHz, and 2048 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also features 1536 Stream Processors, 96 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 6990 5820 points
GeForce GT 640 DDR3 1560 points
Difference: 4260 (273%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 6990 375 Watts
Difference: 310 Watts (477%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 will be 461% faster than the GeForce GT 640 DDR3 in general, because of its greater data rate. (explain)

Radeon HD 6990 320000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 262976 (461%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 453%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 130560 (453%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6990 is superior to the GeForce GT 640 DDR3, and very much so. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 38720 (269%)

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 6990

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 6990
Manufacturer nVidia AMD
Year June 2012 March 2011
Code Name GK107 Antilles
Memory 2048 MB 2048 MB (x2)
Core Speed 900 MHz 830 MHz (x2)
Memory Speed 3564 MHz 5000 MHz (x2)
Power (Max TDP) 65 watts 375 watts
Bandwidth 57024 MB/sec 320000 MB/sec
Texel Rate 28800 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 384 1536 (x2)
Texture Mapping Units 32 96 (x2)
Render Output Units 16 32 (x2)
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit (x2)
Fab Process 28 nm 40 nm
Transistors 1300 million 2640 million
Bus PCIe 3.0 x16 PCIe 2.1 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 megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the 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 that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 6990

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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