GeForce 825M vs GeForce GTX 260 216SP 55 nm

Intro

Compare all of that to the GeForce GTX 260 216SP 55 nm, which comes with a clock speed of 576 MHz and a GDDR3 memory frequency of 999 MHz. It also uses a 448-bit memory bus, and uses a 55 nm design. It is comprised of 216 SPUs, 72 TAUs, and 28 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce GTX 260 216SP 55 nm		171 Watts
	Difference: 138 Watts (418%)

Memory Bandwidth

In theory, the GeForce GTX 260 216SP 55 nm will be 677% quicker than the GeForce 825M overall, because of its greater bandwidth. (explain)

GeForce GTX 260 216SP 55 nm		111888 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 97488 (677%)

Texel Rate

The GeForce GTX 260 216SP 55 nm should be quite a bit (more or less 205%) more effective at anisotropic filtering than the GeForce 825M. (explain)

GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 27872 (205%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 260 216SP 55 nm is the winner, by a large margin. (explain)

GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 9328 (137%)

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 maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the 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 texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can 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 drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.