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Radeon HD 3650 256MB vs Radeon HD 3690/3830

Intro

The Radeon HD 3650 256MB features clock speeds of 725 MHz on the GPU, and 800 MHz on the 256 MB of DDR2 memory. It features 120(24x5) SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Compare all of that to the Radeon HD 3690/3830, which comes with a GPU core clock speed of 668 MHz, and 256 MB of GDDR3 memory running at 828 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 16 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3690/3830 75 Watts
Radeon HD 3650 256MB 78 Watts
Difference: 3 Watts (4%)

Memory Bandwidth

The Radeon HD 3690/3830 should in theory perform a bit faster than the Radeon HD 3650 256MB overall. (explain)

Radeon HD 3690/3830 26496 MB/sec
Radeon HD 3650 256MB 25600 MB/sec
Difference: 896 (4%)

Texel Rate

The Radeon HD 3690/3830 will be a lot (approximately 84%) better at texture filtering than the Radeon HD 3650 256MB. (explain)

Radeon HD 3690/3830 10688 Mtexels/sec
Radeon HD 3650 256MB 5800 Mtexels/sec
Difference: 4888 (84%)

Pixel Rate

The Radeon HD 3690/3830 will be quite a bit (approximately 269%) more effective at FSAA than the Radeon HD 3650 256MB, and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
Radeon HD 3650 256MB 2900 Mpixels/sec
Difference: 7788 (269%)

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 256MB

Amazon.com

Check prices at:

Radeon HD 3690/3830

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 256MB Radeon HD 3690/3830
Manufacturer AMD AMD
Year 2008 2008
Code Name RV635 PRO RV670 PRO
Memory 256 MB 256 MB
Core Speed 725 MHz 668 MHz
Memory Speed 1600 MHz 1656 MHz
Power (Max TDP) 78 watts 75 watts
Bandwidth 25600 MB/sec 26496 MB/sec
Texel Rate 5800 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 10688 Mpixels/sec
Unified Shaders 120(24x5) 320(64x5)
Texture Mapping Units 8 16
Render Output Units 4 16
Bus Type DDR2 GDDR3
Bus Width 128-bit 128-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3650 256MB

Amazon.com

Check prices at:

Radeon HD 3690/3830

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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