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Radeon HD 6990 vs Radeon HD 7750

Intro

The Radeon HD 6990 makes use of a 40 nm design. AMD has set the core frequency at 830 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this model. It features 1536 SPUs along with 96 TAUs and 32 ROPs.

Compare all of that to the Radeon HD 7750, which comes with GPU core speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also features 512 Stream Processors, 32 Texture Address Units, 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 7750 2240 points
Difference: 3580 (160%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 6990 375 Watts
Difference: 320 Watts (582%)

Memory Bandwidth

Performance-wise, the Radeon HD 6990 should in theory be quite a bit better than the Radeon HD 7750 in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 248000 (344%)

Texel Rate

The Radeon HD 6990 should be a lot (about 523%) more effective at texture filtering than the Radeon HD 7750. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 133760 (523%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6990 is a better choice, by far. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 40320 (315%)

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 7750

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 7750
Manufacturer AMD AMD
Year March 2011 February 2012
Code Name Antilles Cape Verde Pro
Memory 2048 MB (x2) 1024 MB
Core Speed 830 MHz (x2) 800 MHz
Memory Speed 5000 MHz (x2) 4500 MHz
Power (Max TDP) 375 watts 55 watts
Bandwidth 320000 MB/sec 72000 MB/sec
Texel Rate 159360 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 1536 (x2) 512
Texture Mapping Units 96 (x2) 32
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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface in one 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 it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon HD 7750

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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