Radeon HD 7870 vs Radeon RX 580

Intro

Compare that to the Radeon RX 580, which features core clock speeds of 1257 MHz on the GPU, and 2000 MHz on the 8192 MB of GDDR5 memory. It features 2304 SPUs along with 144 Texture Address Units and 32 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 RX 580		13630 points
Radeon HD 7870		6230 points
	Difference: 7400 (119%)

Zcash Mining Hash Rate

Radeon RX 580		315 Sol/s
Radeon HD 7870		172 Sol/s
	Difference: 143 (83%)

Ethereum Mining Hash Rate

Radeon RX 580		28 Mh/s
Radeon HD 7870		16 Mh/s
	Difference: 12 (75%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870		175 Watts
Radeon RX 580		185 Watts
	Difference: 10 Watts (6%)

Memory Bandwidth

In theory, the Radeon RX 580 should be 71% quicker than the Radeon HD 7870 overall, because of its greater data rate. (explain)

Radeon RX 580		262144 MB/sec
Radeon HD 7870		153600 MB/sec
	Difference: 108544 (71%)

Texel Rate

The Radeon RX 580 should be quite a bit (about 126%) better at texture filtering than the Radeon HD 7870. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon HD 7870		80000 Mtexels/sec
	Difference: 101008 (126%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon RX 580 is the winner, and very much so. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon HD 7870		32000 Mpixels/sec
	Difference: 8224 (26%)

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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.