GeForce GTX 260 216SP 55 nm vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which features a core clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 260 216SP 55 nm		171 Watts
	Difference: 46 Watts (37%)

Memory Bandwidth

In theory, the Radeon R9 M390X should be a lot faster than the GeForce GTX 260 216SP 55 nm in general. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 260 216SP 55 nm		111888 MB/sec
	Difference: 48112 (43%)

Texel Rate

The Radeon R9 M390X will be much (approximately 123%) faster with regards to anisotropic filtering than the GeForce GTX 260 216SP 55 nm. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
	Difference: 51072 (123%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M390X is superior to the GeForce GTX 260 216SP 55 nm, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
	Difference: 7008 (43%)

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 moved past the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses 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 can be processed per second. This is calculated by multiplying the total amount of texture units by the core 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 the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.