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Radeon HD 6870 vs Radeon HD 6990

Intro

The Radeon HD 6870 makes use of a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this specific card. It features 1120 SPUs as well as 56 TAUs and 32 Rasterization Operator Units.

Compare all that to the Radeon HD 6990, which features clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 TAUs and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6990 5820 points
Radeon HD 6870 2870 points
Difference: 2950 (103%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 6990 375 Watts
Difference: 224 Watts (148%)

Memory Bandwidth

The Radeon HD 6990 should in theory perform quite a bit faster than the Radeon HD 6870 in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 185600 (138%)

Texel Rate

The Radeon HD 6990 is much (about 216%) faster with regards to AF than the Radeon HD 6870. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 108960 (216%)

Pixel Rate

The Radeon HD 6990 is a lot (about 84%) better at FSAA than the Radeon HD 6870, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 6870 28800 Mpixels/sec
Difference: 24320 (84%)

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 6870

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 6870 Radeon HD 6990
Manufacturer AMD AMD
Year October 2010 March 2011
Code Name Barts XT Antilles
Memory 1024 MB 2048 MB (x2)
Core Speed 900 MHz 830 MHz (x2)
Memory Speed 4200 MHz 5000 MHz (x2)
Power (Max TDP) 151 watts 375 watts
Bandwidth 134400 MB/sec 320000 MB/sec
Texel Rate 50400 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 1120 1536 (x2)
Texture Mapping Units 56 96 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 40 nm 40 nm
Transistors 1700 million 2640 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be processed 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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

Display Prices

Hide Prices

Radeon HD 6870

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.

Comments

One Response to “Radeon HD 6870 vs Radeon HD 6990”
J.P says:

It would make sense to compare
the 2 model cards with the same amount of VRAM

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