GeForce 820M vs GeForce GTX 260

Intro

Compare all of that to the GeForce GTX 260, which features GPU clock speed of 576 MHz, and 896 MB of GDDR3 memory running at 999 MHz through a 448-bit bus. It also features 192 SPUs, 64 Texture Address Units, and 28 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 260		182 Watts
	Difference: 167 Watts (1113%)

Memory Bandwidth

Performance-wise, the GeForce GTX 260 should in theory be a lot superior to the GeForce 820M overall. (explain)

GeForce GTX 260		111888 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 95888 (599%)

Texel Rate

The GeForce GTX 260 will be a lot (about 220%) faster with regards to texture filtering than the GeForce 820M. (explain)

GeForce GTX 260		36864 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 25360 (220%)

Pixel Rate

The GeForce GTX 260 will be quite a bit (approximately 461%) more effective at full screen anti-aliasing than the GeForce 820M, and also will be able to handle higher resolutions more effectively. (explain)

GeForce GTX 260		16128 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 13252 (461%)

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 max amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines 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 output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.