Radeon HD 7870 XT vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which features clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs along with 176 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 390X 8G		13555 points
Radeon HD 7870 XT		6390 points
	Difference: 7165 (112%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G		32 Mh/s
Radeon HD 7870 XT		15 Mh/s
	Difference: 17 (113%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon R9 390X 8G should theoretically be a lot superior to the Radeon HD 7870 XT in general. (explain)

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

Texel Rate

The Radeon R9 390X 8G should be quite a bit (about 108%) better at texture filtering than the Radeon HD 7870 XT. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 96000 (108%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 390X 8G is a better choice, by a large margin. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 7870 XT		29600 Mpixels/sec
	Difference: 37600 (127%)

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 (counted in MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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