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GeForce GTX 660 Ti vs Radeon HD 6990

Intro

The GeForce GTX 660 Ti comes with a GPU core clock speed of 915 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1500 MHz through a 192-bit bus. It also is comprised of 1344 Stream Processors, 112 TAUs, and 24 ROPs.

Compare those specifications to the Radeon HD 6990, which features a clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up 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

GeForce GTX 660 Ti 6013 points
Radeon HD 6990 5820 points
Difference: 193 (3%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon HD 6990 375 Watts
Difference: 225 Watts (150%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should be 122% faster than the GeForce GTX 660 Ti in general, because of its greater data rate. (explain)

Radeon HD 6990 320000 MB/sec
GeForce GTX 660 Ti 144000 MB/sec
Difference: 176000 (122%)

Texel Rate

The Radeon HD 6990 will be a lot (more or less 56%) better at AF than the GeForce GTX 660 Ti. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce GTX 660 Ti 102480 Mtexels/sec
Difference: 56880 (56%)

Pixel Rate

The Radeon HD 6990 is quite a bit (more or less 142%) more effective at anti-aliasing than the GeForce GTX 660 Ti, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 31160 (142%)

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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GeForce GTX 660 Ti

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 GeForce GTX 660 Ti Radeon HD 6990
Manufacturer nVidia AMD
Year August 2012 March 2011
Code Name GK104 Antilles
Memory 2048 MB 2048 MB (x2)
Core Speed 915 MHz 830 MHz (x2)
Memory Speed 6000 MHz 5000 MHz (x2)
Power (Max TDP) 150 watts 375 watts
Bandwidth 144000 MB/sec 320000 MB/sec
Texel Rate 102480 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 1344 1536 (x2)
Texture Mapping Units 112 96 (x2)
Render Output Units 24 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit (x2)
Fab Process 28 nm 40 nm
Transistors 3540 million 2640 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the 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 most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GTX 660 Ti

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.

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