GeForce GTX 275 vs GeForce GTX 870M

Intro

Compare that to the GeForce GTX 870M, which features clock speeds of 941 MHz on the GPU, and 1000 MHz on the 3072 MB of GDDR5 memory. It features 1344 SPUs along with 112 Texture Address Units and 24 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
GeForce GTX 275		219 Watts
	Difference: 109 Watts (99%)

Memory Bandwidth

The GeForce GTX 275 should theoretically be a lot faster than the GeForce GTX 870M overall. (explain)

GeForce GTX 275		127008 MB/sec
GeForce GTX 870M		96000 MB/sec
	Difference: 31008 (32%)

Texel Rate

The GeForce GTX 870M should be much (approximately 108%) more effective at anisotropic filtering than the GeForce GTX 275. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 54752 (108%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 870M is a better choice, by far. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 4860 (27%)

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 data (measured in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the 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 number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.