Radeon R9 285 vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which has GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2560 SPUs, 160 TAUs, 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 285		8500 points
	Difference: 4233 (50%)

Ethereum Mining Hash Rate

Radeon R9 390 8G		28 Mh/s
Radeon R9 285		18 Mh/s
	Difference: 10 (56%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285		190 Watts
Radeon R9 390 8G		275 Watts
	Difference: 85 Watts (45%)

Memory Bandwidth

The Radeon R9 390 8G should theoretically perform quite a bit faster than the Radeon R9 285 in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 208000 (118%)

Texel Rate

The Radeon R9 390 8G is a lot (more or less 56%) better at AF than the Radeon R9 285. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 57184 (56%)

Pixel Rate

The Radeon R9 390 8G will be a lot (approximately 118%) more effective at AA than the Radeon R9 285, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 34624 (118%)

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 information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.