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GeForce GTX 285 1GB vs GeForce GTX 470

Intro

The GeForce GTX 285 1GB uses a 55 nm design. nVidia has clocked the core frequency at 648 MHz. The GDDR3 memory is set to run at a frequency of 1242 MHz on this specific model. It features 240 SPUs along with 80 Texture Address Units and 32 ROPs.

Compare that to the GeForce GTX 470, which features GPU core speed of 607 MHz, and 1280 MB of GDDR5 RAM running at 837 MHz through a 320-bit bus. It also is made up of 448 Stream Processors, 56 Texture Address Units, and 40 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 1GB		204 Watts
GeForce GTX 470		215 Watts
	Difference: 11 Watts (5%)

Memory Bandwidth

The GeForce GTX 285 1GB should theoretically perform a small bit faster than the GeForce GTX 470 in general. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce GTX 470		133920 MB/sec
	Difference: 25056 (19%)

Texel Rate

The GeForce GTX 285 1GB is quite a bit (more or less 53%) better at texture filtering than the GeForce GTX 470. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
GeForce GTX 470		33992 Mtexels/sec
	Difference: 17848 (53%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 470 is the winner, though only just barely. (explain)

GeForce GTX 470		24280 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 3544 (17%)

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 GTX 285 1GB

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GeForce GTX 470

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Specifications

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Model	GeForce GTX 285 1GB	GeForce GTX 470
Manufacturer	nVidia	nVidia
Year	January 15, 2009	March 2010
Code Name	G200b	GF100
Memory	1024 MB	1280 MB
Core Speed	648 MHz	607 MHz
Memory Speed	2484 MHz	3348 MHz
Power (Max TDP)	204 watts	215 watts
Bandwidth	158976 MB/sec	133920 MB/sec
Texel Rate	51840 Mtexels/sec	33992 Mtexels/sec
Pixel Rate	20736 Mpixels/sec	24280 Mpixels/sec
Unified Shaders	240	448
Texture Mapping Units	80	56
Render Output Units	32	40
Bus Type	GDDR3	GDDR5
Bus Width	512-bit	320-bit
Fab Process	55 nm	40 nm
Transistors	1400 million	3000 million
Bus	PCIe x16 2.0	PCIe x16
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.1	OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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