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Radeon HD 3650 256MB vs Radeon HD 4670 512MB

Intro

The Radeon HD 3650 256MB has a core clock frequency of 725 MHz and a DDR2 memory frequency of 800 MHz. It also features a 128-bit bus, and makes use of a 55 nm design. It is comprised of 120(24x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare those specifications to the Radeon HD 4670 512MB, which features clock speeds of 750 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR4/GDDR3/DDR3/DDR2 RAM. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB 70 Watts
Radeon HD 3650 256MB 78 Watts
Difference: 8 Watts (11%)

Memory Bandwidth

In theory, the Radeon HD 4670 512MB should be 25% faster than the Radeon HD 3650 256MB overall, because of its greater data rate. (explain)

Radeon HD 4670 512MB 32000 MB/sec
Radeon HD 3650 256MB 25600 MB/sec
Difference: 6400 (25%)

Texel Rate

The Radeon HD 4670 512MB will be a lot (more or less 314%) faster with regards to anisotropic filtering than the Radeon HD 3650 256MB. (explain)

Radeon HD 4670 512MB 24000 Mtexels/sec
Radeon HD 3650 256MB 5800 Mtexels/sec
Difference: 18200 (314%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4670 512MB is a better choice, and very much so. (explain)

Radeon HD 4670 512MB 6000 Mpixels/sec
Radeon HD 3650 256MB 2900 Mpixels/sec
Difference: 3100 (107%)

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 4670 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 4670 512MB
Manufacturer AMD AMD
Year 2008 Sep 10, 2008
Code Name RV635 PRO RV730 XT
Memory 256 MB 512 MB
Core Speed 725 MHz 750 MHz
Memory Speed 1600 MHz 2000 MHz
Power (Max TDP) 78 watts 70 watts
Bandwidth 25600 MB/sec 32000 MB/sec
Texel Rate 5800 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 120(24x5) 320(64x5)
Texture Mapping Units 8 32
Render Output Units 4 8
Bus Type DDR2 GDDR4/GDDR3/DDR3/DDR2
Bus Width 128-bit 128-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 514 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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3650 256MB

Amazon.com

Check prices at:

Radeon HD 4670 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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