GeForce GT 315 vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which comes with core speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs as well as 32 TAUs and 16 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 650		64 Watts
	Difference: 12 Watts (23%)

Memory Bandwidth

In theory, the GeForce GTX 650 should be 216% faster than the GeForce GT 315 in general, due to its greater bandwidth. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 54720 (216%)

Texel Rate

The GeForce GTX 650 will be a lot (approximately 239%) better at anisotropic filtering than the GeForce GT 315. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 23856 (239%)

Pixel Rate

The GeForce GTX 650 will be a lot (approximately 239%) better at AA than the GeForce GT 315, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 11928 (239%)

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 MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 are processed per second. This 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.