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Radeon HD 6990 vs Radeon RX 6500 XT

Intro

The Radeon HD 6990 has a GPU core clock speed of 830 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1250 MHz through a 256-bit bus. It also features 1536 Stream Processors, 96 Texture Address Units, and 32 ROPs.

Compare all of that to the Radeon RX 6500 XT, which comes with a core clock speed of 2200 MHz and a GDDR6 memory frequency of 2250 MHz. It also makes use of a 64-bit bus, and makes use of a 6 nm design. It is comprised of 1024 SPUs, 64 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6500 XT 107 Watts
Radeon HD 6990 375 Watts
Difference: 268 Watts (250%)

Memory Bandwidth

Theoretically, the Radeon HD 6990 should be a lot faster than the Radeon RX 6500 XT in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon RX 6500 XT 147456 MB/sec
Difference: 172544 (117%)

Texel Rate

The Radeon HD 6990 is a small bit (approximately 13%) faster with regards to AF than the Radeon RX 6500 XT. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon RX 6500 XT 140800 Mtexels/sec
Difference: 18560 (13%)

Pixel Rate

The Radeon RX 6500 XT should be much (about 33%) faster with regards to anti-aliasing than the Radeon HD 6990, and capable of handling higher resolutions while still performing well. (explain)

Radeon RX 6500 XT 70400 Mpixels/sec
Radeon HD 6990 53120 Mpixels/sec
Difference: 17280 (33%)

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

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon RX 6500 XT

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 6990 Radeon RX 6500 XT
Manufacturer AMD AMD
Year March 2011 January 2022
Code Name Antilles Navi 24 XT
Memory 2048 MB (x2) 4096 MB
Core Speed 830 MHz (x2) 2200 MHz
Memory Speed 5000 MHz (x2) 4500 GB/s
Power (Max TDP) 375 watts 107 watts
Bandwidth 320000 MB/sec 147456 MB/sec
Texel Rate 159360 Mtexels/sec 140800 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 70400 Mpixels/sec
Unified Shaders 1536 (x2) 1024
Texture Mapping Units 96 (x2) 64
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR6
Bus Width 256-bit (x2) 64-bit
Fab Process 40 nm 6 nm
Transistors 2640 million 5400 million
Bus PCIe 2.1 x16 PCIe 4.0 x16
DirectX Version DirectX 11 DirectX 12
OpenGL Version OpenGL 4.1 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, 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 number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon RX 6500 XT

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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