Radeon HD 6950 2GB vs Radeon RX 570

Intro

Compare all that to the Radeon RX 570, which has GPU clock speed of 1168 MHz, and 4096 MB of GDDR5 RAM running at 1750 MHz through a 256-bit bus. It also features 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 RX 570		150 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 50 Watts (33%)

Memory Bandwidth

Theoretically, the Radeon RX 570 should perform quite a bit faster than the Radeon HD 6950 2GB in general. (explain)

Radeon RX 570		229376 MB/sec
Radeon HD 6950 2GB		160000 MB/sec
	Difference: 69376 (43%)

Texel Rate

The Radeon RX 570 will be much (about 112%) more effective at AF than the Radeon HD 6950 2GB. (explain)

Radeon RX 570		149504 Mtexels/sec
Radeon HD 6950 2GB		70400 Mtexels/sec
	Difference: 79104 (112%)

Pixel Rate

The Radeon RX 570 will be much (approximately 46%) more effective at anti-aliasing than the Radeon HD 6950 2GB, and will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon RX 570		37376 Mpixels/sec
Radeon HD 6950 2GB		25600 Mpixels/sec
	Difference: 11776 (46%)

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 largest amount of data (measured in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range 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 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 processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines 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 also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.