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Radeon HD 6990 vs Radeon HD 7770

Intro

The Radeon HD 6990 uses a 40 nm design. AMD has set the core speed at 830 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this particular model. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

Compare that to the Radeon HD 7770, which has a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 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 7770 3180 points
Difference: 2640 (83%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 6990 375 Watts
Difference: 295 Watts (369%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should be 344% quicker than the Radeon HD 7770 in general, because of its higher data rate. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 248000 (344%)

Texel Rate

The Radeon HD 6990 should be much (about 298%) faster with regards to AF than the Radeon HD 7770. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 119360 (298%)

Pixel Rate

The Radeon HD 6990 should be quite a bit (approximately 232%) faster with regards to AA than the Radeon HD 7770, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 37120 (232%)

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

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Radeon HD 7770

Amazon.com

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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 7770
Manufacturer AMD AMD
Year March 2011 February 2012
Code Name Antilles Cape Verde XT
Memory 2048 MB (x2) 1024 MB
Core Speed 830 MHz (x2) 1000 MHz
Memory Speed 5000 MHz (x2) 4500 MHz
Power (Max TDP) 375 watts 80 watts
Bandwidth 320000 MB/sec 72000 MB/sec
Texel Rate 159360 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1536 (x2) 640
Texture Mapping Units 96 (x2) 40
Render Output Units 32 (x2) 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 1500 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If 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 high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure 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 is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 6990

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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