GeForce GTX 650 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has a clock frequency 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 features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon R9 M390X		125 Watts
	Difference: 61 Watts (95%)

Memory Bandwidth

In theory, the Radeon R9 M390X should be quite a bit faster than the GeForce GTX 650 overall. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 80000 (100%)

Texel Rate

The Radeon R9 M390X will be quite a bit (approximately 173%) better at texture filtering than the GeForce GTX 650. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 58688 (173%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M390X is the winner, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 6208 (37%)

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 information (measured in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the 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 chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.