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On the example of Gigabyte GV-N680OC-4GD.

Features:

• GPU: GeForce GTX 680 (GK104)
• Interface: PCIe 3.0 x16
• GPU clock rate (ROPs/shaders): 1071-1170/1071-1170 MHz (the standard is 1006-1110/1006-1110 MHz)
• Memory clock rate, physical (effective): 1500 (6000) MHz (standard)
• Memory bus: 256-bit
• Stream processors: 1536
• Texture units: 128 (BLF/TLF/ANIS)
• ROP units: 32
• Dimensions: 295x129 mm, tri-slot
• Board color: blue
• Power consumption (3D peak/2D/idle): 210-225/82/61 W
• Display connectors: Dual-Link DVI-I, Dual-Link DVI-D, HDMI, DisplayPort
• Multi-GPU mode: hardware SLI

This card has one 8-pin and one 6-pin supplementary power connectors.

No need to say, this is a custom solution with an improved Durable PCB featuring more layers. Thanks to only copper parts used, the card doesn't heat up as much as the reference variant. There are 8 memory chip sockets instead of 16, and a 6+2-phase power supply unit. Another good thing is that the supplementary power connectors are next to each other, not on top of each other. The latter layout is very inconvenient.

Thanks to the improved power circuitry and custom PCB, the card can work at really high clock rates. E.g., it did great at 1300 MHz core clock, being stable and all.

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