Radeon HD 7870 XT vs Radeon RX 7900 XTX

Intro

Compare all that to the Radeon RX 7900 XTX, which features a GPU core clock speed of 1855 MHz, and 24576 MB of GDDR6 memory running at 2500 MHz through a 384-bit bus. It also is comprised of 6144 SPUs, 384 Texture Address Units, and 192 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT		185 Watts
Radeon RX 7900 XTX		355 Watts
	Difference: 170 Watts (92%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 7900 XTX should be quite a bit faster than the Radeon HD 7870 XT overall. (explain)

Radeon RX 7900 XTX		983040 MB/sec
Radeon HD 7870 XT		192000 MB/sec
	Difference: 791040 (412%)

Texel Rate

The Radeon RX 7900 XTX will be quite a bit (more or less 702%) more effective at AF than the Radeon HD 7870 XT. (explain)

Radeon RX 7900 XTX		712320 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 623520 (702%)

Pixel Rate

The Radeon RX 7900 XTX will be a lot (about 1103%) more effective at anti-aliasing than the Radeon HD 7870 XT, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon RX 7900 XTX		356160 Mpixels/sec
Radeon HD 7870 XT		29600 Mpixels/sec
	Difference: 326560 (1103%)

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 max amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's 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 amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure 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 filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.