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Radeon HD 3850 512MB vs Radeon HD 4770

Intro

The Radeon HD 3850 512MB comes with a clock frequency of 668 MHz and a GDDR3 memory speed of 828 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 4770, which has core clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
Radeon HD 4770 80 Watts
Difference: 5 Watts (7%)

Memory Bandwidth

The Radeon HD 3850 512MB should in theory be a small bit faster than the Radeon HD 4770 in general. (explain)

Radeon HD 3850 512MB 52992 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 1792 (4%)

Texel Rate

The Radeon HD 4770 will be a lot (approximately 125%) more effective at texture filtering than the Radeon HD 3850 512MB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 13312 (125%)

Pixel Rate

The Radeon HD 4770 should be just a bit (about 12%) better at FSAA than the Radeon HD 3850 512MB, and capable of handling higher screen resolutions better. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 3850 512MB 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 512MB

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 512MB Radeon HD 4770
Manufacturer AMD AMD
Year Nov 19, 2007 Apr 28, 2009
Code Name RV670 PRO RV740
Memory 512 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: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 512MB

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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