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GeForce GT 640 DDR3 vs Radeon HD 5550

Intro

The GeForce GT 640 DDR3 makes use of a 28 nm design. nVidia has set the core speed at 900 MHz. The DDR3 memory works at a speed of 1782 MHz on this particular model. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 5550, which comes with core clock speeds of 550 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 RAM. It features 320(64x5) SPUs as well as 16 TAUs and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GT 640 DDR3 should be much faster than the Radeon HD 5550 in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 5550 12800 MB/sec
Difference: 44224 (346%)

Texel Rate

The GeForce GT 640 DDR3 is much (approximately 227%) better at AF than the Radeon HD 5550. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 5550 8800 Mtexels/sec
Difference: 20000 (227%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 640 DDR3 is the winner, by far. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 5550 4400 Mpixels/sec
Difference: 10000 (227%)

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 5550

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 5550
Manufacturer nVidia AMD
Year June 2012 February 9, 2010
Code Name GK107 Redwood LE
Memory 2048 MB 512 MB
Core Speed 900 MHz 550 MHz
Memory Speed 3564 MHz 800 MHz
Power (Max TDP) 65 watts (Unknown) watts
Bandwidth 57024 MB/sec 12800 MB/sec
Texel Rate 28800 Mtexels/sec 8800 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 4400 Mpixels/sec
Unified Shaders 384 320(64x5)
Texture Mapping Units 32 16
Render Output Units 16 8
Bus Type DDR3 DDR2
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 627 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 largest amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 5550

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.

Comments

One Response to “GeForce GT 640 DDR3 vs Radeon HD 5550”
Ben says:

It's worth noting that the 5550 comes in DDR2 and DDR3 (1GB) formats, these numbers just reflect the DDR2 performance, any chance of a DDR3 option too?

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