Radeon HD 7790 vs Radeon RX 6800

Intro

Compare those specs to the Radeon RX 6800, which features a clock speed of 1700 MHz and a GDDR6 memory speed of 2000 MHz. It also makes use of a 256-bit bus, and uses a 7 nm design. It features 3840 SPUs, 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 is 446% quicker than the Radeon HD 7790 overall, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon RX 6800 should be much (more or less 629%) more effective at texture filtering than the Radeon HD 7790. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon RX 6800 is superior to the Radeon HD 7790, and very much so. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.