GeForce GTX 580 vs GeForce GTX 870M

Intro

Compare all that to the GeForce GTX 870M, which makes use of a 28 nm design. nVidia has set the core frequency at 941 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this specific model. It features 1344 SPUs along with 112 Texture Address Units and 24 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 580		4956 points
GeForce GTX 870M		4770 points
	Difference: 186 (4%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
GeForce GTX 580		244 Watts
	Difference: 134 Watts (122%)

Memory Bandwidth

Performance-wise, the GeForce GTX 580 should in theory be much better than the GeForce GTX 870M in general. (explain)

GeForce GTX 580		192384 MB/sec
GeForce GTX 870M		96000 MB/sec
	Difference: 96384 (100%)

Texel Rate

The GeForce GTX 870M will be a lot (about 113%) more effective at anisotropic filtering than the GeForce GTX 580. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GTX 580		49408 Mtexels/sec
	Difference: 55984 (113%)

Pixel Rate

The GeForce GTX 580 should be quite a bit (about 64%) faster with regards to FSAA than the GeForce GTX 870M, and also will be capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce GTX 870M		22584 Mpixels/sec
	Difference: 14472 (64%)

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 information (counted in MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 can be applied per second. This is calculated 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 graphics 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 that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.