Radeon RX 6800 vs Radeon RX 7900 XTX

Intro

Compare those specs to the Radeon RX 7900 XTX, which comes with a clock speed of 1855 MHz and a GDDR6 memory speed of 2500 MHz. It also features a 384-bit bus, and makes use of a 5 nm design. It is made up of 6144 SPUs, 384 TAUs, and 192 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800		250 Watts
Radeon RX 7900 XTX		355 Watts
	Difference: 105 Watts (42%)

Memory Bandwidth

As far as performance goes, the Radeon RX 7900 XTX should theoretically be quite a bit superior to the Radeon RX 6800 in general. (explain)

Radeon RX 7900 XTX		983040 MB/sec
Radeon RX 6800		524288 MB/sec
	Difference: 458752 (88%)

Texel Rate

The Radeon RX 7900 XTX should be a lot (approximately 75%) more effective at texture filtering than the Radeon RX 6800. (explain)

Radeon RX 7900 XTX		712320 Mtexels/sec
Radeon RX 6800		408000 Mtexels/sec
	Difference: 304320 (75%)

Pixel Rate

The Radeon RX 7900 XTX is quite a bit (more or less 118%) faster with regards to full screen anti-aliasing than the Radeon RX 6800, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon RX 7900 XTX		356160 Mpixels/sec
Radeon RX 6800		163200 Mpixels/sec
	Difference: 192960 (118%)

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 (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, 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 number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.