Radeon HD 7870 XT vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which comes with GPU core speed of 1000 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 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 HD 7870 XT		6390 points
	Difference: 6343 (99%)

Ethereum Mining Hash Rate

Radeon R9 390 8G		28 Mh/s
Radeon HD 7870 XT		15 Mh/s
	Difference: 13 (87%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT		185 Watts
Radeon R9 390 8G		275 Watts
	Difference: 90 Watts (49%)

Memory Bandwidth

Performance-wise, the Radeon R9 390 8G should in theory be a lot better than the Radeon HD 7870 XT in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 7870 XT		192000 MB/sec
	Difference: 192000 (100%)

Texel Rate

The Radeon R9 390 8G will be quite a bit (approximately 80%) more effective at anisotropic filtering than the Radeon HD 7870 XT. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 71200 (80%)

Pixel Rate

If using high levels of AA 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 HD 7870 XT		29600 Mpixels/sec
	Difference: 34400 (116%)

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. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.