GeForce GTX 285 2GB vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which comes with core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 79 Watts (63%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M390X should be a little bit faster than the GeForce GTX 285 2GB overall. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 1024 (1%)

Texel Rate

The Radeon R9 M390X will be a lot (more or less 79%) faster with regards to anisotropic filtering than the GeForce GTX 285 2GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 40704 (79%)

Pixel Rate

The Radeon R9 M390X will be just a bit (approximately 12%) more effective at anti-aliasing than the GeForce GTX 285 2GB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 2400 (12%)

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 max amount of information (measured in MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.