GeForce GTX 550 Ti vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 memory works at a speed of 1250 MHz on this specific model. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 550 Ti		116 Watts
Radeon R9 M390X		125 Watts
	Difference: 9 Watts (8%)

Memory Bandwidth

In theory, the Radeon R9 M390X will be 62% faster than the GeForce GTX 550 Ti in general, due to its higher bandwidth. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 550 Ti		98496 MB/sec
	Difference: 61504 (62%)

Texel Rate

The Radeon R9 M390X is quite a bit (about 221%) faster with regards to AF than the GeForce GTX 550 Ti. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 550 Ti		28800 Mtexels/sec
	Difference: 63744 (221%)

Pixel Rate

The Radeon R9 M390X should be a bit (approximately 7%) faster with regards to full screen anti-aliasing than the GeForce GTX 550 Ti, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 550 Ti		21600 Mpixels/sec
	Difference: 1536 (7%)

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 maximum amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's 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 in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.