Radeon HD 4870 512MB vs Radeon RX 470 4GB

Intro

Compare those specifications to the Radeon RX 470 4GB, which makes use of a 14 nm design. AMD has set the core frequency at 926 MHz. The GDDR5 memory works at a speed of 1650 MHz on this specific model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470 4GB		120 Watts
Radeon HD 4870 512MB		150 Watts
	Difference: 30 Watts (25%)

Memory Bandwidth

The Radeon RX 470 4GB should theoretically perform quite a bit faster than the Radeon HD 4870 512MB in general. (explain)

Radeon RX 470 4GB		211200 MB/sec
Radeon HD 4870 512MB		115200 MB/sec
	Difference: 96000 (83%)

Texel Rate

The Radeon RX 470 4GB will be much (more or less 295%) better at AF than the Radeon HD 4870 512MB. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon HD 4870 512MB		30000 Mtexels/sec
	Difference: 88528 (295%)

Pixel Rate

The Radeon RX 470 4GB will be quite a bit (about 147%) better at AA than the Radeon HD 4870 512MB, and able to handle higher resolutions while still performing well. (explain)

Radeon RX 470 4GB		29632 Mpixels/sec
Radeon HD 4870 512MB		12000 Mpixels/sec
	Difference: 17632 (147%)

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 data (in units of MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 can be processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its 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 core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.