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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.

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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

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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 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.

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