GeForce GT 315 vs GeForce GTX 870M

Intro

Compare those specifications to the GeForce GTX 870M, which features GPU core speed of 941 MHz, and 3072 MB of GDDR5 RAM set to run at 1000 MHz through a 192-bit bus. It also is comprised of 1344 Stream Processors, 112 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
GeForce GTX 870M		110 Watts
	Difference: 58 Watts (112%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 870M is 280% quicker than the GeForce GT 315 overall, because of its greater bandwidth. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 70720 (280%)

Texel Rate

The GeForce GTX 870M should be a lot (about 954%) faster with regards to texture filtering than the GeForce GT 315. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 95392 (954%)

Pixel Rate

The GeForce GTX 870M should be quite a bit (approximately 352%) better at anti-aliasing than the GeForce GT 315, and will be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 17584 (352%)

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 (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's 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 higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.