Radeon HD 7870 vs Radeon RX 7900 XTX

Intro

Compare that to the Radeon RX 7900 XTX, which comes with a core clock speed of 1855 MHz and a GDDR6 memory speed of 2500 MHz. It also makes use of a 384-bit bus, and uses 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 HD 7870		175 Watts
Radeon RX 7900 XTX		355 Watts
	Difference: 180 Watts (103%)

Memory Bandwidth

The Radeon RX 7900 XTX, in theory, should perform quite a bit faster than the Radeon HD 7870 overall. (explain)

Radeon RX 7900 XTX		983040 MB/sec
Radeon HD 7870		153600 MB/sec
	Difference: 829440 (540%)

Texel Rate

The Radeon RX 7900 XTX should be much (more or less 790%) better at anisotropic filtering than the Radeon HD 7870. (explain)

Radeon RX 7900 XTX		712320 Mtexels/sec
Radeon HD 7870		80000 Mtexels/sec
	Difference: 632320 (790%)

Pixel Rate

The Radeon RX 7900 XTX should be a lot (approximately 1013%) faster with regards to AA than the Radeon HD 7870, and will be capable of handling higher resolutions more effectively. (explain)

Radeon RX 7900 XTX		356160 Mpixels/sec
Radeon HD 7870		32000 Mpixels/sec
	Difference: 324160 (1013%)

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 maximum amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at 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 chip can possibly record to the local memory per second - measured in millions of pixels per second. The number 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.