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Radeon HD 3470 256MB vs Radeon HD 3650 512MB

Intro

The Radeon HD 3470 256MB comes with a GPU core clock speed of 800 MHz, and the 256 MB of DDR2 memory runs at 950 MHz through a 128-bit bus. It also is comprised of 40(8x5) SPUs, 4 TAUs, and 4 Raster Operation Units.

Compare that to the Radeon HD 3650 512MB, which comes with a GPU core clock speed of 725 MHz, and 512 MB of GDDR3 memory set to run at 800 MHz through a 128-bit bus. It also is made up of 120(24x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3470 256MB should perform a little bit faster than the Radeon HD 3650 512MB in general. (explain)

Radeon HD 3470 256MB 30400 MB/sec
Radeon HD 3650 512MB 25600 MB/sec
Difference: 4800 (19%)

Texel Rate

The Radeon HD 3650 512MB will be quite a bit (about 81%) faster with regards to texture filtering than the Radeon HD 3470 256MB. (explain)

Radeon HD 3650 512MB 5800 Mtexels/sec
Radeon HD 3470 256MB 3200 Mtexels/sec
Difference: 2600 (81%)

Pixel Rate

The Radeon HD 3470 256MB is a bit (more or less 10%) better at FSAA than the Radeon HD 3650 512MB, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 3470 256MB 3200 Mpixels/sec
Radeon HD 3650 512MB 2900 Mpixels/sec
Difference: 300 (10%)

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 3470 256MB

Amazon.com

Check prices at:

Radeon HD 3650 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 3470 256MB Radeon HD 3650 512MB
Manufacturer AMD AMD
Year 2008 2008
Code Name RV620 PRO RV635 PRO
Memory 256 MB 512 MB
Core Speed 800 MHz 725 MHz
Memory Speed 1900 MHz 1600 MHz
Power (Max TDP) (Unknown) watts 78 watts
Bandwidth 30400 MB/sec 25600 MB/sec
Texel Rate 3200 Mtexels/sec 5800 Mtexels/sec
Pixel Rate 3200 Mpixels/sec 2900 Mpixels/sec
Unified Shaders 40(8x5) 120(24x5)
Texture Mapping Units 4 8
Render Output Units 4 4
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 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 max amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the 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 most pixels that the graphics chip can possibly write 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 the card's 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 fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3470 256MB

Amazon.com

Check prices at:

Radeon HD 3650 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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