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GeForce GT 640 DDR3 vs Radeon HD 5570

Intro

The GeForce GT 640 DDR3 features a GPU 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 features 384 Stream Processors, 32 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 5570, which comes with core clock speeds of 650 MHz on the GPU, and 900 MHz on the 512 MB of DDR3 memory. It features 400(80x5) SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570 43 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 22 Watts (51%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 should be much faster than the Radeon HD 5570 in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 5570 28800 MB/sec
Difference: 28224 (98%)

Texel Rate

The GeForce GT 640 DDR3 will be a lot (about 122%) more effective at texture filtering than the Radeon HD 5570. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 5570 13000 Mtexels/sec
Difference: 15800 (122%)

Pixel Rate

The GeForce GT 640 DDR3 will be much (approximately 177%) more effective at anti-aliasing than the Radeon HD 5570, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 5570 5200 Mpixels/sec
Difference: 9200 (177%)

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 5570

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 5570
Manufacturer nVidia AMD
Year June 2012 February 9, 2010
Code Name GK107 Redwood PRO
Memory 2048 MB 512 MB
Core Speed 900 MHz 650 MHz
Memory Speed 3564 MHz 1800 MHz
Power (Max TDP) 65 watts 43 watts
Bandwidth 57024 MB/sec 28800 MB/sec
Texel Rate 28800 Mtexels/sec 13000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 5200 Mpixels/sec
Unified Shaders 384 400(80x5)
Texture Mapping Units 32 20
Render Output Units 16 8
Bus Type DDR3 DDR3
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 maximum amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at 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 chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the 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 HD 5570

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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