Radeon HD 4890 2GB vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which features clock 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
Radeon HD 4890 2GB		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

The Radeon R9 M390X, in theory, should be quite a bit faster than the Radeon HD 4890 2GB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 35200 (28%)

Texel Rate

The Radeon R9 M390X should be much (approximately 131%) better at AF than the Radeon HD 4890 2GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 52544 (131%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M390X is superior to the Radeon HD 4890 2GB, by far. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 7136 (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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.