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Radeon HD 3850 512MB vs Radeon HD 5670

Intro

The Radeon HD 3850 512MB comes with clock speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 5670, which features a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also features 400(80x5) Stream Processors, 20 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
Radeon HD 3850 512MB 75 Watts
Difference: 14 Watts (23%)

Memory Bandwidth

Performance-wise, the Radeon HD 5670 should in theory be quite a bit superior to the Radeon HD 3850 512MB overall. (explain)

Radeon HD 5670 64000 MB/sec
Radeon HD 3850 512MB 52992 MB/sec
Difference: 11008 (21%)

Texel Rate

The Radeon HD 5670 should be much (approximately 45%) better at AF than the Radeon HD 3850 512MB. (explain)

Radeon HD 5670 15500 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 4812 (45%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3850 512MB is the winner, by a large margin. (explain)

Radeon HD 3850 512MB 10688 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 4488 (72%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 5670

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 512MB Radeon HD 5670
Manufacturer AMD AMD
Year Nov 19, 2007 January 14, 2010
Code Name RV670 PRO Redwood XT
Memory 512 MB 1024 MB
Core Speed 668 MHz 775 MHz
Memory Speed 1656 MHz 4000 MHz
Power (Max TDP) 75 watts 61 watts
Bandwidth 52992 MB/sec 64000 MB/sec
Texel Rate 10688 Mtexels/sec 15500 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 6200 Mpixels/sec
Unified Shaders 320(64x5) 400(80x5)
Texture Mapping Units 16 20
Render Output Units 16 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 627 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 are applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at 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 one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 512MB

Amazon.com

Check prices at:

Radeon HD 5670

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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