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GeForce GT 640 DDR3 vs Radeon HD 7990


Intro

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

Compare that to the Radeon HD 7990, which uses a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this model. It features 2048 SPUs along with 128 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 7990 15520 points
GeForce GT 640 DDR3 1560 points
Difference: 13960 (895%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 7990 375 Watts
Difference: 310 Watts (477%)

Memory Bandwidth

The Radeon HD 7990 should in theory perform quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 7990 576000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 518976 (910%)

Texel Rate

The Radeon HD 7990 should be much (about 744%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 7990 243200 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 214400 (744%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is a better choice, and very much so. (explain)

Radeon HD 7990 60800 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 46400 (322%)

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

Radeon HD 7990

Amazon.com

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 7990
Manufacturer nVidia AMD
Year June 2012 April 2013
Code Name GK107 Malta
Memory 2048 MB 3072 MB (x2)
Core Speed 900 MHz 950 MHz (x2)
Memory Speed 3564 MHz 6000 MHz (x2)
Power (Max TDP) 65 watts 375 watts
Bandwidth 57024 MB/sec 576000 MB/sec
Texel Rate 28800 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 384 2048 (x2)
Texture Mapping Units 32 128 (x2)
Render Output Units 16 32 (x2)
Bus Type DDR3 GDDR5
Bus Width 128-bit 384-bit (x2)
Fab Process 28 nm 28 nm
Transistors 1300 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Radeon HD 7990

Amazon.com

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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