Radeon R9 280X vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which has clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 160 Texture Address Units and 64 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 390 8G		12733 points
Radeon R9 280X		8886 points
	Difference: 3847 (43%)

Zcash Mining Hash Rate

Radeon R9 390 8G		326 Sol/s
Radeon R9 280X		294 Sol/s
	Difference: 32 (11%)

Ethereum Mining Hash Rate

Radeon R9 390 8G		28 Mh/s
Radeon R9 280X		21 Mh/s
	Difference: 7 (33%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 280X		250 Watts
Radeon R9 390 8G		275 Watts
	Difference: 25 Watts (10%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should in theory be much better than the Radeon R9 280X in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 280X		288000 MB/sec
	Difference: 96000 (33%)

Texel Rate

The Radeon R9 390 8G is much (more or less 47%) better at texture filtering than the Radeon R9 280X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 280X		108800 Mtexels/sec
	Difference: 51200 (47%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 390 8G is a better choice, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 280X		27200 Mpixels/sec
	Difference: 36800 (135%)

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 megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at 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 chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.