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Radeon HD 3870 512MB vs Radeon HD 4770

Intro

The Radeon HD 3870 512MB uses a 55 nm design. AMD has clocked the core frequency at 775 MHz. The GDDR3 RAM runs at a speed of 900 MHz on this card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon HD 4770, which comes with a clock frequency of 750 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 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 4770 80 Watts
Radeon HD 3870 512MB 106 Watts
Difference: 26 Watts (33%)

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 512MB should in theory be just a bit superior to the Radeon HD 4770 overall. (explain)

Radeon HD 3870 512MB 57600 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The Radeon HD 4770 should be a lot (more or less 94%) more effective at AF than the Radeon HD 3870 512MB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 11600 (94%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 3870 512MB is superior to the Radeon HD 4770, but only just. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 400 (3%)

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 3870 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 3870 512MB Radeon HD 4770
Manufacturer AMD AMD
Year Nov 19, 2007 Apr 28, 2009
Code Name RV670 XT RV740
Memory 512 MB 512 MB
Core Speed 775 MHz 750 MHz
Memory Speed 1800 MHz 3200 MHz
Power (Max TDP) 106 watts 80 watts
Bandwidth 57600 MB/sec 51200 MB/sec
Texel Rate 12400 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 12400 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 (in units of MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 can be processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 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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