GeForce GTX 465 vs GeForce GTX 870M

Intro

Compare that to the GeForce GTX 870M, which has a GPU core clock speed of 941 MHz, and 3072 MB of GDDR5 RAM running at 1000 MHz through a 192-bit bus. It also is comprised of 1344 Stream Processors, 112 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
GeForce GTX 465		200 Watts
	Difference: 90 Watts (82%)

Memory Bandwidth

In theory, the GeForce GTX 465 should be 7% faster than the GeForce GTX 870M overall, because of its higher data rate. (explain)

GeForce GTX 465		102592 MB/sec
GeForce GTX 870M		96000 MB/sec
	Difference: 6592 (7%)

Texel Rate

The GeForce GTX 870M will be a lot (more or less 295%) faster with regards to anisotropic filtering than the GeForce GTX 465. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 78684 (295%)

Pixel Rate

The GeForce GTX 870M is a little bit (about 16%) better at full screen anti-aliasing than the GeForce GTX 465, and also capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 3160 (16%)

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 information (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per 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 - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.