GeForce GTX 285 2GB vs Radeon R9 380 2G

Intro

Compare all of that to the Radeon R9 380 2G, which comes with core speeds of 970 MHz on the GPU, and 1425 MHz on the 2048 MB of GDDR5 memory. It features 1792 SPUs as well as 112 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 2G		190 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 14 Watts (7%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 2G should perform a bit faster than the GeForce GTX 285 2GB overall. (explain)

Radeon R9 380 2G		182400 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 23424 (15%)

Texel Rate

The Radeon R9 380 2G should be quite a bit (more or less 110%) better at texture filtering than the GeForce GTX 285 2GB. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 56800 (110%)

Pixel Rate

The Radeon R9 380 2G will be quite a bit (about 50%) faster with regards to anti-aliasing than the GeForce GTX 285 2GB, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 10304 (50%)

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 max amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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