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Radeon HD 3650 256MB vs Radeon HD 3850 512MB

Intro

The Radeon HD 3650 256MB comes with a GPU core clock speed of 725 MHz, and the 256 MB of DDR2 RAM runs at 800 MHz through a 128-bit bus. It also is comprised of 120(24x5) Stream Processors, 8 Texture Address Units, and 4 ROPs.

Compare those specs to the Radeon HD 3850 512MB, which features a core clock frequency of 668 MHz and a GDDR3 memory speed of 828 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
Radeon HD 3650 256MB 78 Watts
Difference: 3 Watts (4%)

Memory Bandwidth

Performance-wise, the Radeon HD 3850 512MB should in theory be much better than the Radeon HD 3650 256MB in general. (explain)

Radeon HD 3850 512MB 52992 MB/sec
Radeon HD 3650 256MB 25600 MB/sec
Difference: 27392 (107%)

Texel Rate

The Radeon HD 3850 512MB will be much (more or less 84%) better at anisotropic filtering than the Radeon HD 3650 256MB. (explain)

Radeon HD 3850 512MB 10688 Mtexels/sec
Radeon HD 3650 256MB 5800 Mtexels/sec
Difference: 4888 (84%)

Pixel Rate

The Radeon HD 3850 512MB will be much (about 269%) faster with regards to full screen anti-aliasing than the Radeon HD 3650 256MB, and will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 3850 512MB 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 3850 512MB

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 3850 512MB
Manufacturer AMD AMD
Year 2008 Nov 19, 2007
Code Name RV635 PRO RV670 PRO
Memory 256 MB 512 MB
Core Speed 725 MHz 668 MHz
Memory Speed 1600 MHz 1656 MHz
Power (Max TDP) 78 watts 75 watts
Bandwidth 25600 MB/sec 52992 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 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3650 256MB

Amazon.com

Check prices at:

Radeon HD 3850 512MB

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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