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GeForce GT 640 DDR3 vs Radeon R9 270

Intro

The GeForce GT 640 DDR3 makes use of a 28 nm design. nVidia has clocked the core speed at 900 MHz. The DDR3 RAM runs at a frequency of 1782 MHz on this particular model. It features 384 SPUs along with 32 TAUs and 16 ROPs.

Compare that to the Radeon R9 270, which has a core clock speed of 900 MHz and a GDDR5 memory speed of 1400 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

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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 R9 270 5943 points
GeForce GT 640 DDR3 1560 points
Difference: 4383 (281%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon R9 270 150 Watts
Difference: 85 Watts (131%)

Memory Bandwidth

Theoretically, the Radeon R9 270 should be a lot faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon R9 270 179200 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 122176 (214%)

Texel Rate

The Radeon R9 270 is much (more or less 150%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon R9 270 72000 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 43200 (150%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 270 is a better choice, by far. (explain)

Radeon R9 270 28800 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 14400 (100%)

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.

Price Comparison

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GeForce GT 640 DDR3

Amazon.com

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Radeon R9 270

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 R9 270
Manufacturer nVidia AMD
Year June 2012 November 2013
Code Name GK107 Curacao Pro
Memory 2048 MB 2048 MB
Core Speed 900 MHz 900 MHz
Memory Speed 3564 MHz 5600 MHz
Power (Max TDP) 65 watts 150 watts
Bandwidth 57024 MB/sec 179200 MB/sec
Texel Rate 28800 Mtexels/sec 72000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 384 1280
Texture Mapping Units 32 80
Render Output Units 16 32
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 1300 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon R9 270

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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