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Radeon HD 3650 vs Radeon HD 3690/3830

Intro

The Radeon HD 3650 uses a 55 nm design. AMD has set the core frequency at 725 MHz. The GDDR4 memory runs at a speed of 800 MHz on this particular card. It features 120(24x5) SPUs as well as 8 TAUs and 4 ROPs.

Compare all of that to the Radeon HD 3690/3830, which comes with clock speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 3690/3830 should perform just a bit faster than the Radeon HD 3650 overall. (explain)

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

Texel Rate

The Radeon HD 3690/3830 will be a lot (more or less 84%) faster with regards to AF than the Radeon HD 3650. (explain)

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

Pixel Rate

The Radeon HD 3690/3830 is quite a bit (more or less 269%) better at FSAA than the Radeon HD 3650, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
Radeon HD 3650 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

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 Radeon HD 3690/3830
Manufacturer AMD AMD
Year 2008 2008
Code Name RV635 PRO RV670 PRO
Memory 1024 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 GDDR4 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: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units 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 output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3650

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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