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GeForce GT 640 DDR3 vs Radeon HD 5450

Intro

The GeForce GT 640 DDR3 has a core clock speed of 900 MHz and a DDR3 memory frequency of 1782 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 5450, which features GPU core speed of 650 MHz, and 512 MB of DDR3 RAM set to run at 800 MHz through a 64-bit bus. It also is comprised of 80(16x5) Stream Processors, 8 TAUs, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 46 Watts (242%)

Memory Bandwidth

In theory, the GeForce GT 640 DDR3 is 346% quicker than the Radeon HD 5450 in general, due to its higher data rate. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 44224 (346%)

Texel Rate

The GeForce GT 640 DDR3 is a lot (about 454%) better at anisotropic filtering than the Radeon HD 5450. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 23600 (454%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 640 DDR3 is a better choice, and very much so. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 11800 (454%)

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 HD 5450

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 HD 5450
Manufacturer nVidia AMD
Year June 2012 February 4, 2010
Code Name GK107 Cedar PRO
Memory 2048 MB 512 MB
Core Speed 900 MHz 650 MHz
Memory Speed 3564 MHz 1600 MHz
Power (Max TDP) 65 watts 19 watts
Bandwidth 57024 MB/sec 12800 MB/sec
Texel Rate 28800 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 384 80(16x5)
Texture Mapping Units 32 8
Render Output Units 16 4
Bus Type DDR3 DDR3
Bus Width 128-bit 64-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 292 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the 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 higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 5450

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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