GeForce GTX 465 vs GeForce GTX 870M

Intro

Compare that to the GeForce GTX 870M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 941 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this model. It features 1344 SPUs along with 112 TAUs 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

Theoretically speaking, the GeForce GTX 465 should be 7% faster than the GeForce GTX 870M overall, due to its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 870M is a lot (approximately 295%) better at texture 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 will be a small bit (about 16%) faster with regards to anti-aliasing than the GeForce GTX 465, and also should be capable of handling higher resolutions without slowing down too much. (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: Bandwidth is the max amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.