GeForce RTX 4090 vs Radeon R9 285

Intro

Compare those specs to the Radeon R9 285, which comes with a core clock frequency of 918 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285		190 Watts
GeForce RTX 4090		450 Watts
	Difference: 260 Watts (137%)

Memory Bandwidth

Theoretically speaking, the GeForce RTX 4090 will be 492% faster than the Radeon R9 285 overall, because of its higher data rate. (explain)

GeForce RTX 4090		1042432 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 866432 (492%)

Texel Rate

The GeForce RTX 4090 is much (approximately 1013%) better at anisotropic filtering than the Radeon R9 285. (explain)

GeForce RTX 4090		1144320 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 1041504 (1013%)

Pixel Rate

The GeForce RTX 4090 will be a lot (about 1239%) faster with regards to AA than the Radeon R9 285, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce RTX 4090		393360 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 363984 (1239%)

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 (counted in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.