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Radeon HD 6990 vs Radeon HD 7870 XT

Intro

The Radeon HD 6990 comes with a GPU core clock speed of 830 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1250 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 7870 XT, which has a clock frequency of 925 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It is comprised of 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

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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 7870 XT 6390 points
Radeon HD 6990 5820 points
Difference: 570 (10%)

Ethereum Mining Hash Rate

Radeon HD 6990 24 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 9 (60%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon HD 6990 375 Watts
Difference: 190 Watts (103%)

Memory Bandwidth

In theory, the Radeon HD 6990 should perform much faster than the Radeon HD 7870 XT in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 7870 XT 192000 MB/sec
Difference: 128000 (67%)

Texel Rate

The Radeon HD 6990 will be quite a bit (approximately 79%) more effective at texture filtering than the Radeon HD 7870 XT. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 70560 (79%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6990 is superior to the Radeon HD 7870 XT, by a large margin. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 23520 (79%)

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 6990

Amazon.com

Check prices at:

Radeon HD 7870 XT

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 6990 Radeon HD 7870 XT
Manufacturer AMD AMD
Year March 2011 November 2012
Code Name Antilles Tahiti LE
Memory 2048 MB (x2) 2048 MB
Core Speed 830 MHz (x2) 925 MHz
Memory Speed 5000 MHz (x2) 6000 MHz
Power (Max TDP) 375 watts 185 watts
Bandwidth 320000 MB/sec 192000 MB/sec
Texel Rate 159360 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1536 (x2) 1536
Texture Mapping Units 96 (x2) 96
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 4313 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

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

Display Prices

Hide Prices

Radeon HD 6990

Amazon.com

Check prices at:

Radeon HD 7870 XT

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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