Radeon HD 7790 vs Radeon RX 6800 XT

Intro

Compare all that to the Radeon RX 6800 XT, which uses a 7 nm design. AMD has clocked the core frequency at 1825 MHz. The GDDR6 RAM runs at a frequency of 2000 MHz on this model. It features 4608 SPUs along with 288 Texture Address Units and 128 ROPs.

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

Theoretically speaking, the Radeon RX 6800 XT should be 446% faster than the Radeon HD 7790 overall, due to 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 quite a bit (approximately 839%) better at 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 is much (about 1360%) more effective at FSAA than the Radeon HD 7790, and capable of handling higher screen resolutions without slowing down too much. (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: Bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.