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Radeon HD 3650 vs Radeon HD 6790

Intro

The Radeon HD 3650 has a core clock speed of 725 MHz and a GDDR4 memory speed of 800 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It is made up of 120(24x5) SPUs, 8 TAUs, and 4 ROPs.

Compare those specifications 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.

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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

Performance-wise, the Radeon HD 6790 should theoretically be much superior to the Radeon HD 3650 overall. (explain)

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

Texel Rate

The Radeon HD 6790 is a lot (more or less 479%) more effective at texture 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 lots of anti-aliasing is important to you, then the Radeon HD 6790 is a better choice, by far. (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 max amount of data (counted in MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the card's clock speed. 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 fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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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.

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