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Radeon HD 6990 vs Radeon RX 6650 XT

Intro

The Radeon HD 6990 features a core clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It features 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon RX 6650 XT, which has clock speeds of 2055 MHz on the GPU, and 2190 MHz on the 8192 MB of GDDR6 memory. It features 2048 SPUs as well as 128 Texture Address Units and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6650 XT 176 Watts
Radeon HD 6990 375 Watts
Difference: 199 Watts (113%)

Memory Bandwidth

Performance-wise, the Radeon HD 6990 should theoretically be a little bit better than the Radeon RX 6650 XT overall. (explain)

Radeon HD 6990 320000 MB/sec
Radeon RX 6650 XT 287072 MB/sec
Difference: 32928 (11%)

Texel Rate

The Radeon RX 6650 XT will be a lot (about 65%) better at texture filtering than the Radeon HD 6990. (explain)

Radeon RX 6650 XT 263040 Mtexels/sec
Radeon HD 6990 159360 Mtexels/sec
Difference: 103680 (65%)

Pixel Rate

The Radeon RX 6650 XT will be quite a bit (about 148%) faster with regards to FSAA than the Radeon HD 6990, and will be able to handle higher resolutions better. (explain)

Radeon RX 6650 XT 131520 Mpixels/sec
Radeon HD 6990 53120 Mpixels/sec
Difference: 78400 (148%)

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 6650 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 6650 XT
Manufacturer AMD AMD
Year March 2011 May 2022
Code Name Antilles Navi 23
Memory 2048 MB (x2) 8192 MB
Core Speed 830 MHz (x2) 2055 MHz
Memory Speed 5000 MHz (x2) 4380 GB/s
Power (Max TDP) 375 watts 176 watts
Bandwidth 320000 MB/sec 287072 MB/sec
Texel Rate 159360 Mtexels/sec 263040 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 131520 Mpixels/sec
Unified Shaders 1536 (x2) 2048
Texture Mapping Units 96 (x2) 128
Render Output Units 32 (x2) 64
Bus Type GDDR5 GDDR6
Bus Width 256-bit (x2) 128-bit
Fab Process 40 nm 7 nm
Transistors 2640 million 11060 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: Bandwidth is the max amount of data (measured in megabytes per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at 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 graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6990

Amazon.com

Check prices at:

Radeon RX 6650 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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