Radeon HD 7790 vs Radeon RX 6800 XT

Intro

Compare all of that to the Radeon RX 6800 XT, which features a core clock speed of 1825 MHz and a GDDR6 memory frequency of 2000 MHz. It also features a 256-bit memory bus, and makes use of a 7 nm design. It is comprised of 4608 SPUs, 288 TAUs, and 128 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 215 Watts (253%)

Memory Bandwidth

In theory, the Radeon RX 6800 XT should be 446% quicker than the Radeon HD 7790 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon RX 6800 XT will be a lot (more or less 839%) faster with regards to anisotropic filtering than the Radeon HD 7790. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 469600 (839%)

Pixel Rate

The Radeon RX 6800 XT should be much (approximately 1360%) faster with regards to AA than the Radeon HD 7790, and able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 217600 (1360%)

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 max amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.