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GeForce GT 640 DDR3 vs Radeon HD 5570

Intro

The GeForce GT 640 DDR3 comes with a clock speed of 900 MHz and a DDR3 memory frequency of 1782 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 5570, which features a GPU core clock speed of 650 MHz, and 512 MB of DDR3 RAM set to run at 900 MHz through a 128-bit bus. It also is made up of 400(80x5) Stream Processors, 20 TAUs, and 8 ROPs.

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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, the GeForce GT 640 DDR3 should perform quite a bit faster than the Radeon HD 5570 overall. (explain)

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

Texel Rate

The GeForce GT 640 DDR3 is a lot (about 122%) better 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 should be a lot (about 177%) better at AA than the Radeon HD 5570, and will be capable of handling higher screen resolutions without losing too much performance. (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

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Radeon HD 5570

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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 information (measured in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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

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