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Radeon HD 3870 X2 512MB vs Radeon HD 7770

Intro

The Radeon HD 3870 X2 512MB features a GPU core clock speed of 825 MHz, and the 512 MB of GDDR3 RAM runs at 900 MHz through a 256-bit bus. It also is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 7770, which makes use of a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory runs at a frequency of 1125 MHz on this particular card. It features 640 SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 512MB is 60% faster than the Radeon HD 7770 in general, because of its greater bandwidth. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 43200 (60%)

Texel Rate

The Radeon HD 7770 will be a lot (more or less 52%) better at AF than the Radeon HD 3870 X2 512MB. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Difference: 13600 (52%)

Pixel Rate

The Radeon HD 3870 X2 512MB is much (more or less 65%) faster with regards to AA than the Radeon HD 7770, and also capable of handling higher resolutions better. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 10400 (65%)

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

Check prices at:

Radeon HD 7770

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 X2 512MB Radeon HD 7770
Manufacturer AMD AMD
Year Jan 28, 2008 February 2012
Code Name R680 Cape Verde XT
Memory 512 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 1000 MHz
Memory Speed 1800 MHz (x2) 4500 MHz
Power (Max TDP) (Unknown) watts 80 watts
Bandwidth 115200 MB/sec 72000 MB/sec
Texel Rate 26400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 320(64x5) (x2) 640
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 28 nm
Transistors (Unknown) million 1500 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock 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 rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 512MB

Amazon.com

Check prices at:

Radeon HD 7770

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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