GeForce GTX 680 vs Radeon HD 6990

If you are going to buy a new graphics card and are choosing between GeForce GTX 680 and Radeon HD 6990, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce GTX 680 stacks up against Radeon HD 6990, check out specs charts below.

Main Specs

  GeForce GTX 680 Radeon HD 6990
Power consumption (TDP) 195 Watt 375 Watt
Interface PCIe 3.0 x16 PCIe 2.0 x16
Supplementary power connectors Two 6-pin 2x 8-pin
Memory type GDDR5 GDDR5
Maximum RAM amount 2048 MB 2 GB
Display Connectors 2x DVI, 1x HDMI, 1x DisplayPort 1x DVI, 4x mini-DisplayPort
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  • Radeon HD 6990 has 92% more power consumption, than GeForce GTX 680.
  • GeForce GTX 680 is connected by PCIe 3.0 x16, and Radeon HD 6990 uses PCIe 2.0 x16 interface.
  • GeForce GTX 680 has 2046 GB more memory, than Radeon HD 6990.
  • Both cards are used in Desktops.
  • GeForce GTX 680 is build with Kepler architecture, and Radeon HD 6990 - with TeraScale 3.
  • Core clock speed of GeForce GTX 680 is 176 MHz higher, than Radeon HD 6990.
  • GeForce GTX 680 is manufactured by 28 nm process technology, and Radeon HD 6990 - by 40 nm process technology.
  • Radeon HD 6990 is 285 mm longer, than GeForce GTX 680.
  • Memory clock speed of GeForce GTX 680 is 1000 MHz higher, than Radeon HD 6990.

Game benchmarks

high / 1080p 35−40 14−16
ultra / 1080p 21−24 9−10
QHD / 1440p 16−18 3−4
4K / 2160p 10−11
low / 720p 60−65 30−35
medium / 1080p 40−45 18−20
The average gaming FPS of GeForce GTX 680 in Assassin's Creed Odyssey is 140% more, than Radeon HD 6990.

Full Specs

  GeForce GTX 680 Radeon HD 6990
Architecture Kepler TeraScale 3
Code name GK104 Antilles
Type Desktop Desktop
Release date 22 March 2012 8 March 2011
Pipelines 1536 1536
Core clock speed 1006 MHz 830 MHz
Boost Clock 1058 MHz
Transistor count 3,540 million 2,640 million
Manufacturing process technology 28 nm 40 nm
Texture fill rate 128.8 billion/sec 79.68
Floating-point performance 3,090.4 gflops 2x 2,549.8 gflops
Length 10.0" (25.4 cm) 295 mm
Memory bus width 256-bit GDDR5 256 Bit
Memory clock speed 6000 MHz 5000 MHz
Memory bandwidth 192.2 GB/s 160.0 GB/s
Shared memory -
DirectX 12 (11_0) 11.2 (11_0)
Shader Model 5.1 5.0
OpenGL 4.2 4.4
OpenCL 1.2 1.2
Vulkan 1.1.126 N/A
CUDA +
CUDA cores 1536
Bus support PCI Express 3.0
Height 4.376" (11.1 cm)
SLI options +
Multi monitor support 4 displays
HDMI +
HDCP +
Maximum VGA resolution 2048x1536
Audio input for HDMI Internal
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