GeForce GT 315 vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which comes with a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is comprised of 2816 Stream Processors, 176 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 223 Watts (429%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G should be 1419% quicker than the GeForce GT 315 in general, because of its higher data rate. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 358720 (1419%)

Texel Rate

The Radeon R9 390X 8G will be a lot (about 1748%) better at anisotropic filtering than the GeForce GT 315. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 174800 (1748%)

Pixel Rate

The Radeon R9 390X 8G is quite a bit (about 1244%) faster with regards to full screen anti-aliasing than the GeForce GT 315, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 62200 (1244%)

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 information (in units of MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.