Radeon HD 7790 vs Radeon RX 6800

Intro

Compare those specs to the Radeon RX 6800, which comes with clock speeds of 1700 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 memory. It features 3840 SPUs as well as 240 TAUs and 96 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon RX 6800		250 Watts
	Difference: 165 Watts (194%)

Memory Bandwidth

In theory, the Radeon RX 6800 should be quite a bit faster than the Radeon HD 7790 in general. (explain)

Radeon RX 6800		524288 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 428288 (446%)

Texel Rate

The Radeon RX 6800 will be much (approximately 629%) better at AF than the Radeon HD 7790. (explain)

Radeon RX 6800		408000 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 352000 (629%)

Pixel Rate

The Radeon RX 6800 should be much (about 920%) faster with regards to full screen anti-aliasing than the Radeon HD 7790, and will be able to handle higher resolutions while still performing well. (explain)

Radeon RX 6800		163200 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 147200 (920%)

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 (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 can be applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most 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 - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.