Radeon R9 280X vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which comes with GPU core speed of 1050 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 Texture Address Units, and 64 Raster Operation Units.

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 390X 8G		13555 points
Radeon R9 280X		8886 points
	Difference: 4669 (53%)

Zcash Mining Hash Rate

Radeon R9 390X 8G		330 Sol/s
Radeon R9 280X		294 Sol/s
	Difference: 36 (12%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G		32 Mh/s
Radeon R9 280X		21 Mh/s
	Difference: 11 (52%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the Radeon R9 390X 8G should theoretically be much superior to the Radeon R9 280X in general. (explain)

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

Texel Rate

The Radeon R9 390X 8G is much (about 70%) faster with regards to AF than the Radeon R9 280X. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 280X		108800 Mtexels/sec
	Difference: 76000 (70%)

Pixel Rate

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

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 280X		27200 Mpixels/sec
	Difference: 40000 (147%)

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 (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.