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Radeon HD 3850 256MB vs Radeon HD 4770

Intro

The Radeon HD 3850 256MB comes with a GPU core clock speed of 668 MHz, and the 256 MB of GDDR3 memory is set to run at 828 MHz through a 256-bit bus. It also is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 4770, which comes with clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
Radeon HD 4770 80 Watts
Difference: 5 Watts (7%)

Memory Bandwidth

In theory, the Radeon HD 3850 256MB should perform a little bit faster than the Radeon HD 4770 in general. (explain)

Radeon HD 3850 256MB 52992 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 1792 (4%)

Texel Rate

The Radeon HD 4770 is a lot (more or less 125%) faster with regards to texture filtering than the Radeon HD 3850 256MB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 13312 (125%)

Pixel Rate

The Radeon HD 4770 will be just a bit (about 12%) faster with regards to AA than the Radeon HD 3850 256MB, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 3850 256MB 10688 Mpixels/sec
Difference: 1312 (12%)

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 4770

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 4770
Manufacturer AMD AMD
Year Nov 19, 2007 Apr 28, 2009
Code Name RV670 PRO RV740
Memory 256 MB 512 MB
Core Speed 668 MHz 750 MHz
Memory Speed 1656 MHz 3200 MHz
Power (Max TDP) 75 watts 80 watts
Bandwidth 52992 MB/sec 51200 MB/sec
Texel Rate 10688 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 320(64x5) 640(128x5)
Texture Mapping Units 16 32
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 826 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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs 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 fill rate also depends 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 3850 256MB

Amazon.com

Check prices at:

Radeon HD 4770

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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