GeForce 820M vs GeForce GTX 260 Core 216

Intro

Compare those specifications to the GeForce GTX 260 Core 216, which comes with a clock speed of 576 MHz and a GDDR3 memory speed of 999 MHz. It also features a 448-bit memory bus, and uses a 65 nm design. It is comprised of 216 SPUs, 72 Texture Address Units, and 28 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 260 Core 216		202 Watts
	Difference: 187 Watts (1247%)

Memory Bandwidth

In theory, the GeForce GTX 260 Core 216 should perform much faster than the GeForce 820M in general. (explain)

GeForce GTX 260 Core 216		111888 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 95888 (599%)

Texel Rate

The GeForce GTX 260 Core 216 is much (approximately 261%) more effective at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTX 260 Core 216		41472 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 29968 (261%)

Pixel Rate

The GeForce GTX 260 Core 216 should be much (approximately 461%) more effective at full screen anti-aliasing than the GeForce 820M, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 260 Core 216		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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. 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 many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.