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Radeon HD 3850 256MB vs Radeon HD 4730

Intro

The Radeon HD 3850 256MB comes with a clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 4730, which has GPU clock speed of 700 MHz, and 512 MB of GDDR5 RAM running at 900 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
Radeon HD 4730 140 Watts
Difference: 65 Watts (87%)

Memory Bandwidth

Theoretically, the Radeon HD 4730 should perform a bit faster than the Radeon HD 3850 256MB overall. (explain)

Radeon HD 4730 57600 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 4608 (9%)

Texel Rate

The Radeon HD 4730 is much (more or less 110%) more effective at AF than the Radeon HD 3850 256MB. (explain)

Radeon HD 4730 22400 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 11712 (110%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 3850 256MB is the winner, by far. (explain)

Radeon HD 3850 256MB 10688 Mpixels/sec
Radeon HD 4730 5600 Mpixels/sec
Difference: 5088 (91%)

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 3850 256MB

Amazon.com

Check prices at:

Radeon HD 4730

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 3850 256MB Radeon HD 4730
Manufacturer AMD AMD
Year Nov 19, 2007 Jun 8, 2009
Code Name RV670 PRO RV770/CE
Memory 256 MB 512 MB
Core Speed 668 MHz 700 MHz
Memory Speed 1656 MHz 3600 MHz
Power (Max TDP) 75 watts 140 watts
Bandwidth 52992 MB/sec 57600 MB/sec
Texel Rate 10688 Mtexels/sec 22400 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 5600 Mpixels/sec
Unified Shaders 320(64x5) 640(128x5)
Texture Mapping Units 16 32
Render Output Units 16 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen 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 texture units by the core speed of the chip. The better the texel rate, the better the graphics 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 maximum number of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 256MB

Amazon.com

Check prices at:

Radeon HD 4730

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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