GeForce GTX 275 vs GeForce GTX 870M

Intro

Compare those specifications to the GeForce GTX 870M, which uses a 28 nm design. nVidia has clocked the core frequency at 941 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this particular model. It features 1344 SPUs as well as 112 TAUs 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

In theory, the GeForce GTX 275 should be 32% quicker than the GeForce GTX 870M in general, 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 will be a lot (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 is a lot (more or less 27%) faster with regards to full screen anti-aliasing than the GeForce GTX 275, and should be able to handle higher resolutions more effectively. (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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 are processed per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.