Radeon HD 3870 512MB vs Radeon RX 570

Intro

Compare all that to the Radeon RX 570, which features a core clock speed of 1168 MHz and a GDDR5 memory speed of 1750 MHz. It also features a 256-bit memory bus, and uses a 14 nm design. It features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 512MB		106 Watts
Radeon RX 570		150 Watts
	Difference: 44 Watts (42%)

Memory Bandwidth

Theoretically, the Radeon RX 570 should be much faster than the Radeon HD 3870 512MB in general. (explain)

Radeon RX 570		229376 MB/sec
Radeon HD 3870 512MB		57600 MB/sec
	Difference: 171776 (298%)

Texel Rate

The Radeon RX 570 is quite a bit (approximately 1106%) faster with regards to anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon RX 570		149504 Mtexels/sec
Radeon HD 3870 512MB		12400 Mtexels/sec
	Difference: 137104 (1106%)

Pixel Rate

The Radeon RX 570 will be a lot (about 201%) better at anti-aliasing than the Radeon HD 3870 512MB, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon RX 570		37376 Mpixels/sec
Radeon HD 3870 512MB		12400 Mpixels/sec
	Difference: 24976 (201%)

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 largest amount of information (in units of MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.