Articles: Graphics

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Design and Features

The Zotac GeForce GTX 680 2GB AMP! Edition looks exactly like the GTX 670 AMP! Edition model from the same brand. The face side of the PCB is covered by the metallic casing of the cooling system with two bright-orange fans.



The sticking-out heat pipes increase the height of the card to 125 millimeters whereas its length and thickness are 266 and 56 millimeters, respectively, but the PCB alone is 255 millimeters long. The card is too thick to be used in a 2-way SLI configuration if there’s only one other slot between the graphics PCI Express slots on the mainboard.

The card is equipped with two dual-link DVI outputs, one HDMI version 1.4a, and one DisplayPort version 1.2. There’s also a vent grid in the mounting bracket to exhaust the hot air out of the system case.

Two MIO and two 6-pin power connectors can be found in their conventional locations.


The cooling system is attached to the PCB with only four screws around the GPU, so it is easy to remove. Then, we took off the heatsinks from the power system components and memory chips to have a good view of the PCB.


Contrary to our expectations, Zotac’s engineers use a reference PCB with 4+2-phase power system for this AMP! Edition product: 4 phases for the GPU and 2 for everything else.

That was okay for the Zotac GeForce GTX 670 AMP! Edition, but leaves us somewhat disappointed now because some other manufacturers reinforce the power supply of their GTX 680s by installing a fifth GPU power phase or even redesigning the entire PCB.

Since there are no differences from the reference PCB design here, the power system is managed by a PWM-controller RT8802A from Richtek Technology located on the reverse side of the PCB.

The 28nm GK104 chip was manufactured in Taiwan on the 15th week of 2012 (mid-April). It is revision A2, the only revision we can find on serially manufactured products.

The GPU has the standard GTX 680 configuration except for clock rate which is 1110 MHz in 3D mode, or 10.3% higher than the reference card’s. The boost clock rate is up to 1176 MHz high. In 2D mode the GPU clock rate is dropped to 324 MHz. That’s not the highest factory overclocking possible. For example, the ASUS GeForce GTX 680 DirectCU II TOP has a default GPU frequency of 1137 MHz (boosted to 1201 MHz) and is theoretically faster. However, the Zotac has its memory pre-overclocked by 10%, to 6608 MHz in 3D mode, which may give it an edge against the ASUS at high graphics loads.

Although pre-overclocked, the Zotac GeForce GTX 680 AMP! Edition has the same memory chips as most other top-end single-GPU Nvidia-based cards: Hynix H5GQ2H24MFR R0C.

Here is a summary of the graphics card’s specs reported by GPU-Z:

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