Radeon HD 7870 XT vs Radeon RX 6600

Intro

Compare all that to the Radeon RX 6600, which has core clock speeds of 1626 MHz on the GPU, and 1750 MHz on the 8192 MB of GDDR6 RAM. It features 1792 SPUs along with 112 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6600		132 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 53 Watts (40%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 6600 should be 19% quicker than the Radeon HD 7870 XT overall, due to its greater bandwidth. (explain)

Radeon RX 6600		229376 MB/sec
Radeon HD 7870 XT		192000 MB/sec
	Difference: 37376 (19%)

Texel Rate

The Radeon RX 6600 should be quite a bit (approximately 105%) faster with regards to texture filtering than the Radeon HD 7870 XT. (explain)

Radeon RX 6600		182112 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 93312 (105%)

Pixel Rate

The Radeon RX 6600 should be much (approximately 252%) more effective at AA than the Radeon HD 7870 XT, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 6600		104064 Mpixels/sec
Radeon HD 7870 XT		29600 Mpixels/sec
	Difference: 74464 (252%)

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 data (in units of megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, 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 texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.