GeForce GTX 460 (OEM) vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which makes use of a 28 nm design. nVidia has set the core speed at 1058 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this card. It features 384 SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTX 460 (OEM)		150 Watts
	Difference: 86 Watts (134%)

Memory Bandwidth

Performance-wise, the GeForce GTX 460 (OEM) should theoretically be quite a bit superior to the GeForce GTX 650 overall. (explain)

GeForce GTX 460 (OEM)		108800 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 28800 (36%)

Texel Rate

The GeForce GTX 460 (OEM) should be a small bit (about 8%) more effective at texture filtering than the GeForce GTX 650. (explain)

GeForce GTX 460 (OEM)		36400 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 2544 (8%)

Pixel Rate

The GeForce GTX 460 (OEM) is quite a bit (approximately 23%) better at anti-aliasing than the GeForce GTX 650, and should be able to handle higher screen resolutions better. (explain)

GeForce GTX 460 (OEM)		20800 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 3872 (23%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.