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Radeon HD 3870 512MB vs Radeon HD 4770

Intro

The Radeon HD 3870 512MB comes with a clock speed of 775 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 4770, which comes with a core clock speed of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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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 a little bit better than 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 is a lot (more or less 94%) better at texture filtering 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 using a high resolution is important to you, then the Radeon HD 3870 512MB is superior to the Radeon HD 4770, but not by far. (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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. 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 card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum 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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