Radeon R9 290X vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which comes with GPU core speed of 1000 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also is comprised of 2560 SPUs, 160 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 390 8G		12733 points
Radeon R9 290X		10609 points
	Difference: 2124 (20%)

Zcash Mining Hash Rate

Radeon R9 290X		369 Sol/s
Radeon R9 390 8G		326 Sol/s
	Difference: 43 (13%)

Ethereum Mining Hash Rate

Radeon R9 290X		29 Mh/s
Radeon R9 390 8G		28 Mh/s
	Difference: 1 (4%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 390 8G		275 Watts
Radeon R9 290X		300 Watts
	Difference: 25 Watts (9%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should theoretically be just a bit superior to the Radeon R9 290X overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 290X		320000 MB/sec
	Difference: 64000 (20%)

Texel Rate

The Radeon R9 390 8G should be a little bit (approximately 14%) better at anisotropic filtering than the Radeon R9 290X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 290X		140800 Mtexels/sec
	Difference: 19200 (14%)

Pixel Rate

The Radeon R9 390 8G will be a lot (more or less 25%) more effective at FSAA than the Radeon R9 290X, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 290X		51200 Mpixels/sec
	Difference: 12800 (25%)

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 max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core clock 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 per second.

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