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GeForce GTX 260 216SP 55 nm vs GeForce GTX 650

Intro

The GeForce GTX 260 216SP 55 nm comes with clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 RAM. It features 216 SPUs as well as 72 TAUs and 28 ROPs.

Compare all of that to the GeForce GTX 650, which comes with GPU clock speed of 1058 MHz, and 1024 MB of GDDR5 RAM running at 1250 MHz through a 128-bit bus. It also is comprised of 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTX 260 216SP 55 nm		171 Watts
	Difference: 107 Watts (167%)

Memory Bandwidth

The GeForce GTX 260 216SP 55 nm, in theory, should perform much faster than the GeForce GTX 650 in general. (explain)

GeForce GTX 260 216SP 55 nm		111888 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 31888 (40%)

Texel Rate

The GeForce GTX 260 216SP 55 nm will be a lot (more or less 22%) better at texture filtering than the GeForce GTX 650. (explain)

GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 7616 (22%)

Pixel Rate

The GeForce GTX 650 should be just a bit (approximately 5%) better at full screen anti-aliasing than the GeForce GTX 260 216SP 55 nm, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
	Difference: 800 (5%)

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 260 216SP 55 nm

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Specifications

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Model	GeForce GTX 260 216SP 55 nm	GeForce GTX 650
Manufacturer	nVidia	nVidia
Year	December 22, 2008	September 2012
Code Name	G200b	GK107
Memory	896 MB	1024 MB
Core Speed	576 MHz	1058 MHz
Memory Speed	1998 MHz	5000 MHz
Power (Max TDP)	171 watts	64 watts
Bandwidth	111888 MB/sec	80000 MB/sec
Texel Rate	41472 Mtexels/sec	33856 Mtexels/sec
Pixel Rate	16128 Mpixels/sec	16928 Mpixels/sec
Unified Shaders	216	384
Texture Mapping Units	72	32
Render Output Units	28	16
Bus Type	GDDR3	GDDR5
Bus Width	448-bit	128-bit
Fab Process	55 nm	28 nm
Transistors	1400 million	1300 million
Bus	PCIe x16 2.0	PCIe 3.0 x16
DirectX Version	DirectX 10	DirectX 11.0
OpenGL Version	OpenGL 3.1	OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video 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 most pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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