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Radeon HD 3850 1GB vs Radeon HD 4770

Intro

The Radeon HD 3850 1GB features core clock speeds of 668 MHz on the GPU, and 828 MHz on the 1024 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Compare all that to the Radeon HD 4770, which features a clock frequency of 750 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 1GB 75 Watts
Radeon HD 4770 80 Watts
Difference: 5 Watts (7%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 1GB is 4% faster than the Radeon HD 4770 overall, due to its higher data rate. (explain)

Radeon HD 3850 1GB 52992 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 1792 (4%)

Texel Rate

The Radeon HD 4770 is much (more or less 125%) faster with regards to texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 13312 (125%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4770 is superior to the Radeon HD 3850 1GB, though not by far. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 3850 1GB 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 1GB

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 1GB Radeon HD 4770
Manufacturer AMD AMD
Year Nov 19, 2007 Apr 28, 2009
Code Name RV670 PRO RV740
Memory 1024 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 largest amount of information (counted 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. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 1GB

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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