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GeForce GT 640 DDR3 vs Radeon R9 270

Intro

The GeForce GT 640 DDR3 has clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon R9 270, which makes use of a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1400 MHz on this model. It features 1280 SPUs as well as 80 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 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

In theory, the Radeon R9 270 should be 214% quicker than the GeForce GT 640 DDR3 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 270 should be quite a bit (approximately 150%) more effective at AF 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

The Radeon R9 270 should be a lot (more or less 100%) better at full screen anti-aliasing than the GeForce GT 640 DDR3, and will be capable of handling higher screen resolutions while still performing well. (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

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.

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: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR 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 by the core speed of the chip. The higher this number, 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 most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few 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 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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