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Radeon HD 3470 256MB vs Radeon HD 3650

Intro

The Radeon HD 3470 256MB has a core clock speed of 800 MHz and a DDR2 memory frequency of 950 MHz. It also features a 128-bit memory bus, and uses a 55 nm design. It is comprised of 40(8x5) SPUs, 4 Texture Address Units, and 4 Raster Operation Units.

Compare those specs to the Radeon HD 3650, which comes with a GPU core clock speed of 725 MHz, and 1024 MB of GDDR4 RAM running at 800 MHz through a 128-bit bus. It also is made up of 120(24x5) SPUs, 8 TAUs, and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3470 256MB is 19% quicker than the Radeon HD 3650 overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 3650 is quite a bit (approximately 81%) faster with regards to anisotropic filtering than the Radeon HD 3470 256MB. (explain)

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

Pixel Rate

The Radeon HD 3470 256MB will be a bit (more or less 10%) faster with regards to full screen anti-aliasing than the Radeon HD 3650, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 3470 256MB 3200 Mpixels/sec
Radeon HD 3650 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

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
Manufacturer AMD AMD
Year 2008 2008
Code Name RV620 PRO RV635 PRO
Memory 256 MB 1024 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 GDDR4
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 largest amount of data (measured in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 3470 256MB

Amazon.com

Check prices at:

Radeon HD 3650

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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