Radeon R9 270X vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which comes with GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also features 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 270X		6590 points
	Difference: 6143 (93%)

Zcash Mining Hash Rate

Radeon R9 390 8G		326 Sol/s
Radeon R9 270X		177 Sol/s
	Difference: 149 (84%)

Ethereum Mining Hash Rate

Radeon R9 390 8G		28 Mh/s
Radeon R9 270X		18 Mh/s
	Difference: 10 (56%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X		180 Watts
Radeon R9 390 8G		275 Watts
	Difference: 95 Watts (53%)

Memory Bandwidth

In theory, the Radeon R9 390 8G is 114% faster than the Radeon R9 270X overall, because of its greater bandwidth. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 270X		179200 MB/sec
	Difference: 204800 (114%)

Texel Rate

The Radeon R9 390 8G is much (about 100%) better at anisotropic filtering than the Radeon R9 270X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 270X		80000 Mtexels/sec
	Difference: 80000 (100%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 390 8G is the winner, by a large margin. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 270X		32000 Mpixels/sec
	Difference: 32000 (100%)

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 (measured in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it 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 anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.