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Radeon HD 6850 vs Radeon HD 7990

Intro

The Radeon HD 6850 uses a 40 nm design. AMD has set the core speed at 775 MHz. The GDDR5 memory works at a speed of 1000 MHz on this particular card. It features 960 SPUs as well as 48 Texture Address Units and 32 ROPs.

Compare those specs to the Radeon HD 7990, which features a clock speed of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 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 7990 15520 points
Radeon HD 6850 2395 points
Difference: 13125 (548%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 7990 375 Watts
Difference: 248 Watts (195%)

Memory Bandwidth

Theoretically, the Radeon HD 7990 should be a lot faster than the Radeon HD 6850 overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 6850 128000 MB/sec
Difference: 448000 (350%)

Texel Rate

The Radeon HD 7990 is quite a bit (about 554%) faster with regards to texture filtering than the Radeon HD 6850. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 206000 (554%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is superior to the Radeon HD 6850, by a large margin. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 6850 24800 Mpixels/sec
Difference: 36000 (145%)

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 6850

Amazon.com

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Radeon HD 7990

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 6850 Radeon HD 7990
Manufacturer AMD AMD
Year October 2010 April 2013
Code Name Barts Pro Malta
Memory 1024 MB 3072 MB (x2)
Core Speed 775 MHz 950 MHz (x2)
Memory Speed 4000 MHz 6000 MHz (x2)
Power (Max TDP) 127 watts 375 watts
Bandwidth 128000 MB/sec 576000 MB/sec
Texel Rate 37200 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 960 2048 (x2)
Texture Mapping Units 48 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 40 nm 28 nm
Transistors 1700 million 4313 million
Bus PCIe 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 max amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Display Prices

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Radeon HD 6850

Amazon.com

Check prices at:

Radeon HD 7990

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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