GeForce GTX 275 vs GeForce GTX 870M

Intro

Compare those specs 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 is set to run at a speed of 1000 MHz on this model. It features 1344 SPUs along with 112 TAUs and 24 ROPs.

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

Theoretically speaking, the GeForce GTX 275 will be 32% quicker than the GeForce GTX 870M overall, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce GTX 870M should be quite a bit (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

The GeForce GTX 870M will be a lot (about 27%) more effective at AA than the GeForce GTX 275, and also will be able to handle higher resolutions while still performing well. (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 largest amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, 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 graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.