GeForce RTX 3080 vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which features GPU core speed of 830 MHz, and 2048 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce RTX 3080		320 Watts
Radeon HD 6990		375 Watts
	Difference: 55 Watts (17%)

Memory Bandwidth

As far as performance goes, the GeForce RTX 3080 should theoretically be quite a bit superior to the Radeon HD 6990 overall. (explain)

GeForce RTX 3080		778547 MB/sec
Radeon HD 6990		320000 MB/sec
	Difference: 458547 (143%)

Texel Rate

The GeForce RTX 3080 should be much (approximately 146%) more effective at texture filtering than the Radeon HD 6990. (explain)

GeForce RTX 3080		391680 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 232320 (146%)

Pixel Rate

The GeForce RTX 3080 should be quite a bit (about 160%) better at anti-aliasing than the Radeon HD 6990, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce RTX 3080		138240 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 85120 (160%)

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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.