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GeForce GT 640 DDR3 vs Radeon HD 7990


Intro

The GeForce GT 640 DDR3 comes with clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

Compare that to the Radeon HD 7990, which uses a 28 nm design. AMD has clocked the core speed at 950 MHz. The GDDR5 memory works at a speed of 1500 MHz on this card. It features 2048 SPUs as well as 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

Theoretically speaking, the Radeon HD 7990 should be 910% faster than the GeForce GT 640 DDR3 overall, due to its greater data rate. (explain)

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

Texel Rate

The Radeon HD 7990 is a lot (more or less 744%) more effective at anisotropic 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

The Radeon HD 7990 should be quite a bit (about 322%) more effective at FSAA than the GeForce GT 640 DDR3, and also will be capable of handling higher resolutions more effectively. (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 (counted in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum 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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