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Radeon HD 6990 vs Radeon RX 6500 XT

Intro

The Radeon HD 6990 comes with a core clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon RX 6500 XT, which features core speeds of 2200 MHz on the GPU, and 2250 MHz on the 4096 MB of GDDR6 memory. It features 1024 SPUs along with 64 TAUs and 32 Rasterization Operator Units.

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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

In theory, the Radeon HD 6990 should be much 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 will be a little bit (approximately 13%) more effective at 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 a lot (more or less 33%) faster with regards to full screen anti-aliasing than the Radeon HD 6990, and also will be capable of handling higher resolutions better. (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 max amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

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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