GeForce GT 315 vs GeForce GTX 870M

Intro

Compare all of that to the GeForce GTX 870M, which has a core clock frequency of 941 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 192-bit memory bus, and makes use of a 28 nm design. It features 1344 SPUs, 112 TAUs, and 24 ROPs.

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

In theory, the GeForce GTX 870M will be 280% quicker than the GeForce GT 315 overall, because of its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 870M will be quite a bit (more or less 954%) faster with regards to anisotropic 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 is quite a bit (more or less 352%) faster with regards to FSAA than the GeForce GT 315, and also should be capable of handling higher screen resolutions without slowing down too much. (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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 are processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.