Radeon R9 285 vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which features 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 TAUs and 64 Rasterization Operator 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 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

Theoretically speaking, the Radeon R9 390 8G should be 118% faster than the Radeon R9 285 overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 390 8G will be much (about 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 should be a lot (about 118%) better at full screen anti-aliasing than the Radeon R9 285, and also will be capable of handling higher 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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 number of texture map elements (texels) that are processed in one second. This figure 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.