Radeon HD 7870 XT vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which uses a 28 nm design. AMD has set the core frequency at 1050 MHz. The GDDR5 memory works at a frequency of 1500 MHz on this specific model. It features 2816 SPUs along with 176 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 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

As far as performance goes, the Radeon R9 390X 8G should in theory be quite a bit better than the Radeon HD 7870 XT overall. (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 is quite a bit (approximately 108%) faster with regards to 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

The Radeon R9 390X 8G should be much (about 127%) better at AA than the Radeon HD 7870 XT, and will be able to handle higher resolutions more effectively. (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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units by the core 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 in a second.

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