GeForce RTX 3080 12 GB vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which features GPU clock speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce RTX 3080 12 GB		350 Watts
Radeon HD 7990		375 Watts
	Difference: 25 Watts (7%)

Memory Bandwidth

As far as performance goes, the GeForce RTX 3080 12 GB should theoretically be quite a bit better than the Radeon HD 7990 in general. (explain)

GeForce RTX 3080 12 GB		934298 MB/sec
Radeon HD 7990		576000 MB/sec
	Difference: 358298 (62%)

Texel Rate

The GeForce RTX 3080 12 GB is quite a bit (more or less 45%) better at texture filtering than the Radeon HD 7990. (explain)

GeForce RTX 3080 12 GB		352800 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 109600 (45%)

Pixel Rate

If using a high resolution is important to you, then the GeForce RTX 3080 12 GB is a better choice, by a large margin. (explain)

GeForce RTX 3080 12 GB		141120 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 80320 (132%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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 ability to get to the max fill rate.