Radeon HD 7870 XT vs Radeon RX 580

Intro

Compare that to the Radeon RX 580, which comes with core clock speeds of 1257 MHz on the GPU, and 2000 MHz on the 8192 MB of GDDR5 RAM. It features 2304 SPUs along with 144 TAUs and 32 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 RX 580		13630 points
Radeon HD 7870 XT		6390 points
	Difference: 7240 (113%)

Ethereum Mining Hash Rate

Radeon RX 580		28 Mh/s
Radeon HD 7870 XT		15 Mh/s
	Difference: 13 (87%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon RX 580 should be 37% quicker than the Radeon HD 7870 XT overall, due to its higher data rate. (explain)

Radeon RX 580		262144 MB/sec
Radeon HD 7870 XT		192000 MB/sec
	Difference: 70144 (37%)

Texel Rate

The Radeon RX 580 is much (about 104%) more effective at texture filtering than the Radeon HD 7870 XT. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 92208 (104%)

Pixel Rate

The Radeon RX 580 is quite a bit (approximately 36%) faster with regards to full screen anti-aliasing than the Radeon HD 7870 XT, and also will be able to handle higher resolutions more effectively. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon HD 7870 XT		29600 Mpixels/sec
	Difference: 10624 (36%)

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 maximum amount of information (in units of MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the video 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 most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units 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 output 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 max fill rate.