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GeForce GTX 260 216SP 55 nm vs GeForce GTX 650

Intro

The GeForce GTX 260 216SP 55 nm features a core clock frequency of 576 MHz and a GDDR3 memory speed of 999 MHz. It also uses a 448-bit memory bus, and makes use of a 55 nm design. It is comprised of 216 SPUs, 72 TAUs, and 28 Raster Operation Units.

Compare all of that to the GeForce GTX 650, which features core clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 RAM. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator 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 be quite a bit 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 should be a lot (about 22%) more effective 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 a small bit (about 5%) more effective at FSAA than the GeForce GTX 260 216SP 55 nm, and will be able to handle higher screen resolutions without losing too much performance. (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 data (in units of megabytes per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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