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GeForce GT 640 DDR3 vs Radeon HD 7990

Intro

The GeForce GT 640 DDR3 has a GPU core clock speed of 900 MHz, and the 2048 MB of DDR3 RAM is set to run at 1782 MHz through a 128-bit bus. It also is comprised of 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 7990, which comes with GPU clock speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is made up of 2048 Stream Processors, 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

In theory, the Radeon HD 7990 should be 910% faster than the GeForce GT 640 DDR3 overall, due to its greater bandwidth. (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%) more effective at AF 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 using high levels of AA is important to you, then the Radeon HD 7990 is the winner, by a large margin. (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

GeForce GT 640 DDR3

Radeon HD 7990

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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. 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 output 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 maximum fill rate.

GeForce GT 640 DDR3

Radeon HD 7990

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