Radeon HD 7770 vs Radeon RX 7900 XT

Intro

Compare all of that to the Radeon RX 7900 XT, which features a clock frequency of 1500 MHz and a GDDR6 memory speed of 2500 MHz. It also uses a 320-bit memory bus, and uses a 5 nm design. It is comprised of 5376 SPUs, 336 TAUs, and 192 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon RX 7900 XT		300 Watts
	Difference: 220 Watts (275%)

Memory Bandwidth

As far as performance goes, the Radeon RX 7900 XT should in theory be quite a bit better than the Radeon HD 7770 in general. (explain)

Radeon RX 7900 XT		819200 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 747200 (1038%)

Texel Rate

The Radeon RX 7900 XT is much (more or less 1160%) better at texture filtering than the Radeon HD 7770. (explain)

Radeon RX 7900 XT		504000 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 464000 (1160%)

Pixel Rate

The Radeon RX 7900 XT is quite a bit (about 1700%) faster with regards to AA than the Radeon HD 7770, and able to handle higher screen resolutions more effectively. (explain)

Radeon RX 7900 XT		288000 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 272000 (1700%)

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 information (in units of MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.