Radeon HD 4890 1GB vs Radeon RX 6500 XT

Intro

Compare all that to the Radeon RX 6500 XT, which has a core clock frequency of 2200 MHz and a GDDR6 memory speed of 2250 MHz. It also uses a 64-bit bus, and makes use of a 6 nm design. It features 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6500 XT		107 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 83 Watts (78%)

Memory Bandwidth

In theory, the Radeon RX 6500 XT should be 18% quicker than the Radeon HD 4890 1GB overall, because of its greater data rate. (explain)

Radeon RX 6500 XT		147456 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 22656 (18%)

Texel Rate

The Radeon RX 6500 XT is much (about 252%) more effective at anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon RX 6500 XT		140800 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 100800 (252%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 6500 XT is superior to the Radeon HD 4890 1GB, by a large margin. (explain)

Radeon RX 6500 XT		70400 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 54400 (340%)

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 information (in units of megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.