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Radeon HD 3870 X2 1GB vs Radeon HD 6990

Intro

The Radeon HD 3870 X2 1GB comes with core clock speeds of 825 MHz on the GPU, and 1126 MHz on the 1024 MB of GDDR4 RAM. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6990, which has a core clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1536 SPUs, 96 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 will be 122% quicker than the Radeon HD 3870 X2 1GB overall, because of its higher data rate. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 175872 (122%)

Texel Rate

The Radeon HD 6990 should be quite a bit (about 504%) faster with regards to AF than the Radeon HD 3870 X2 1GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 132960 (504%)

Pixel Rate

The Radeon HD 6990 will be a lot (about 101%) more effective at full screen anti-aliasing than the Radeon HD 3870 X2 1GB, and able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Difference: 26720 (101%)

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 1GB

Amazon.com

Check prices at:

Radeon HD 6990

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 1GB Radeon HD 6990
Manufacturer AMD AMD
Year Jan 28, 2008 March 2011
Code Name R680 Antilles
Memory 1024 MB (x2) 2048 MB (x2)
Core Speed 825 MHz (x2) 830 MHz (x2)
Memory Speed 2252 MHz (x2) 5000 MHz (x2)
Power (Max TDP) (Unknown) watts 375 watts
Bandwidth 144128 MB/sec 320000 MB/sec
Texel Rate 26400 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 320(64x5) (x2) 1536 (x2)
Texture Mapping Units 16 (x2) 96 (x2)
Render Output Units 16 (x2) 32 (x2)
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 256-bit (x2)
Fab Process 55 nm 40 nm
Transistors (Unknown) million 2640 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon HD 6990

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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