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GeForce GTX 285 1GB vs GeForce GTX 470

Intro

The GeForce GTX 285 1GB features a GPU clock speed of 648 MHz, and the 1024 MB of GDDR3 memory runs at 1242 MHz through a 512-bit bus. It also features 240 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Compare all that to the GeForce GTX 470, which uses a 40 nm design. nVidia has clocked the core frequency at 607 MHz. The GDDR5 RAM works at a speed of 837 MHz on this specific card. It features 448 SPUs along with 56 Texture Address Units and 40 ROPs.

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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

Performance-wise, the GeForce GTX 285 1GB should theoretically be just a bit better 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 a lot (approximately 53%) better at AF than the GeForce GTX 470. (explain)

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

Pixel Rate

The GeForce GTX 470 is a little bit (more or less 17%) more effective at anti-aliasing than the GeForce GTX 285 1GB, and will be capable of handling higher resolutions without slowing down too much. (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 (counted in megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, 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 most pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 maximum fill rate.

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