Radeon HD 3870 1GB vs Radeon RX 570

Intro

Compare those specs to the Radeon RX 570, which comes with GPU clock speed of 1168 MHz, and 4096 MB of GDDR5 RAM running at 1750 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 1GB		106 Watts
Radeon RX 570		150 Watts
	Difference: 44 Watts (42%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 570 will be 219% quicker than the Radeon HD 3870 1GB overall, because of its greater data rate. (explain)

Radeon RX 570		229376 MB/sec
Radeon HD 3870 1GB		72000 MB/sec
	Difference: 157376 (219%)

Texel Rate

The Radeon RX 570 should be quite a bit (approximately 1106%) faster with regards to anisotropic filtering than the Radeon HD 3870 1GB. (explain)

Radeon RX 570		149504 Mtexels/sec
Radeon HD 3870 1GB		12400 Mtexels/sec
	Difference: 137104 (1106%)

Pixel Rate

The Radeon RX 570 will be quite a bit (approximately 201%) faster with regards to FSAA than the Radeon HD 3870 1GB, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon RX 570		37376 Mpixels/sec
Radeon HD 3870 1GB		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 data (counted in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses 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 high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.