GeForce GTX 260 216SP 55 nm vs GeForce GTX 650

Intro

Compare all that to the GeForce GTX 650, which makes use of a 28 nm design. nVidia has set the core frequency at 1058 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this particular 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 260 216SP 55 nm		171 Watts
	Difference: 107 Watts (167%)

Memory Bandwidth

The GeForce GTX 260 216SP 55 nm, in theory, should perform a lot 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 quite a bit (approximately 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 will be a bit (more or less 5%) faster with regards to anti-aliasing than the GeForce GTX 260 216SP 55 nm, and also should be able to handle higher screen resolutions better. (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

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.