GeForce GTX 275 vs GeForce GTX 650

Intro

Compare those specs to the GeForce GTX 650, which uses a 28 nm design. nVidia has clocked the core frequency at 1058 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this model. It features 384 SPUs as well as 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 275		219 Watts
	Difference: 155 Watts (242%)

Memory Bandwidth

In theory, the GeForce GTX 275 is 59% quicker than the GeForce GTX 650 overall, because of its greater data rate. (explain)

GeForce GTX 275		127008 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 47008 (59%)

Texel Rate

The GeForce GTX 275 is much (more or less 50%) more effective at anisotropic filtering than the GeForce GTX 650. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 16784 (50%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 275 is a better choice, though only just barely. (explain)

GeForce GTX 275		17724 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 796 (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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high 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 number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.