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Radeon HD 3870 X2 512MB vs Radeon HD 6770 1GB

Intro

The Radeon HD 3870 X2 512MB has a GPU core speed of 825 MHz, and the 512 MB of GDDR3 memory is set to run at 900 MHz through a 256-bit bus. It also features 320(64x5) Stream Processors, 16 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory runs at a frequency of 1050 MHz on this particular model. It features 800 SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3870 X2 512MB, in theory, should perform quite a bit faster than the Radeon HD 6770 1GB overall. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 48000 (71%)

Texel Rate

The Radeon HD 6770 1GB should be much (about 36%) more effective at AF than the Radeon HD 3870 X2 512MB. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Difference: 9600 (36%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3870 X2 512MB is superior to the Radeon HD 6770 1GB, and very much so. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 6770 1GB 14400 Mpixels/sec
Difference: 12000 (83%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3870 X2 512MB

Amazon.com

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Radeon HD 6770 1GB

Amazon.com

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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 X2 512MB Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Jan 28, 2008 January 2011
Code Name R680 Juniper XT
Memory 512 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 900 MHz
Memory Speed 1800 MHz (x2) 4200 MHz
Power (Max TDP) (Unknown) watts 108 watts
Bandwidth 115200 MB/sec 67200 MB/sec
Texel Rate 26400 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 320(64x5) (x2) 800
Texture Mapping Units 16 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, 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 graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 512MB

Amazon.com

Check prices at:

Radeon HD 6770 1GB

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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