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Radeon HD 3470 512MB vs Radeon HD 3650 256MB

Intro

The Radeon HD 3470 512MB comes with a clock speed of 800 MHz and a GDDR3 memory frequency of 950 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It is comprised of 40(8x5) SPUs, 4 TAUs, and 4 Raster Operation Units.

Compare all that to the Radeon HD 3650 256MB, which features a clock speed of 725 MHz and a DDR2 memory speed of 800 MHz. It also features a 128-bit bus, and uses a 55 nm design. It features 120(24x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3470 512MB should in theory be a bit better than the Radeon HD 3650 256MB overall. (explain)

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

Texel Rate

The Radeon HD 3650 256MB should be much (approximately 81%) better at AF than the Radeon HD 3470 512MB. (explain)

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

Pixel Rate

The Radeon HD 3470 512MB will be a little bit (more or less 10%) more effective at full screen anti-aliasing than the Radeon HD 3650 256MB, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 3470 512MB 3200 Mpixels/sec
Radeon HD 3650 256MB 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 512MB

Amazon.com

Check prices at:

Radeon HD 3650 256MB

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 512MB Radeon HD 3650 256MB
Manufacturer AMD AMD
Year 2008 2008
Code Name RV620 PRO RV635 PRO
Memory 512 MB 256 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 GDDR3 DDR2
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: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, 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 per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably 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 3470 512MB

Amazon.com

Check prices at:

Radeon HD 3650 256MB

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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