GeForce GT 315 vs GeForce GTX 880M

Intro

Compare those specifications to the GeForce GTX 880M, which has a clock speed of 954 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
GeForce GTX 880M		130 Watts
	Difference: 78 Watts (150%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 880M is 406% quicker than the GeForce GT 315 overall, because of its higher data rate. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 102720 (406%)

Texel Rate

The GeForce GTX 880M is much (approximately 1121%) faster with regards to texture filtering than the GeForce GT 315. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 112112 (1121%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 880M is superior to the GeForce GT 315, by a large margin. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 25528 (511%)

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 (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one 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 better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.