GeForce GTX 480 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which features GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 480		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Performance-wise, the GeForce GTX 480 should theoretically be just a bit better than the Radeon R9 M390X in general. (explain)

GeForce GTX 480		177408 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 17408 (11%)

Texel Rate

The Radeon R9 M390X should be much (more or less 120%) more effective at AF than the GeForce GTX 480. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 480		42000 Mtexels/sec
	Difference: 50544 (120%)

Pixel Rate

The GeForce GTX 480 should be quite a bit (more or less 45%) faster with regards to FSAA than the Radeon R9 M390X, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 10464 (45%)

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 largest amount of data (measured in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 in one second. This figure is calculated by multiplying the total number of texture units by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.