GeForce GT 315 vs GeForce GTX 980M

Intro

Compare all of that to the GeForce GTX 980M, which has core clock speeds of 1038 MHz on the GPU, and 1000 MHz on the 4096 MB of GDDR5 memory. It features 1536 SPUs as well as 96 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
GeForce GTX 980M		100 Watts
	Difference: 48 Watts (92%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 980M should in theory be much superior to the GeForce GT 315 overall. (explain)

GeForce GTX 980M		128000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 102720 (406%)

Texel Rate

The GeForce GTX 980M will be a lot (about 896%) faster with regards to texture filtering than the GeForce GT 315. (explain)

GeForce GTX 980M		99648 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 89648 (896%)

Pixel Rate

The GeForce GTX 980M should be quite a bit (approximately 1229%) better at anti-aliasing than the GeForce GT 315, and also capable of handling higher screen resolutions better. (explain)

GeForce GTX 980M		66432 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 61432 (1229%)

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 information (measured in megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.