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Radeon HD 3650 vs Radeon HD 6790

Intro

The Radeon HD 3650 features a GPU clock speed of 725 MHz, and the 1024 MB of GDDR4 RAM runs at 800 MHz through a 128-bit bus. It also features 120(24x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare that to the Radeon HD 6790, which comes with core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 78 Watts
Radeon HD 6790 150 Watts
Difference: 72 Watts (92%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 will be 425% faster than the Radeon HD 3650 in general, because of its higher bandwidth. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 3650 25600 MB/sec
Difference: 108800 (425%)

Texel Rate

The Radeon HD 6790 is quite a bit (more or less 479%) faster with regards to anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 3650 5800 Mtexels/sec
Difference: 27800 (479%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6790 is the winner, by a large margin. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 3650 2900 Mpixels/sec
Difference: 10540 (363%)

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.

Price Comparison

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Radeon HD 3650

Amazon.com

Check prices at:

Radeon HD 6790

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 3650 Radeon HD 6790
Manufacturer AMD AMD
Year 2008 April 2011
Code Name RV635 PRO Barts LE
Memory 1024 MB 1024 MB
Core Speed 725 MHz 840 MHz
Memory Speed 1600 MHz 4200 MHz
Power (Max TDP) 78 watts 150 watts
Bandwidth 25600 MB/sec 134400 MB/sec
Texel Rate 5800 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 120(24x5) 800
Texture Mapping Units 8 40
Render Output Units 4 16
Bus Type GDDR4 GDDR5
Bus Width 128-bit 256-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1700 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This 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 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 most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3650

Amazon.com

Check prices at:

Radeon HD 6790

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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