Sapphire first unveiled its Radeon HD 7990 Atomic at Computex 2013 last month and it instantly grabbed the attention of many enthusiasts. Sapphire Radeon HD 7990 Atomic is based on dual Tahiti XT2 GPUs and a custom 12 layer PCB with a state of the art water cooling solution. Its an eye candy graphics card which is due for launch in the coming weeks.
Sapphire Radeon HD 7990 Atomic PCB
Sapphire decided to do something out of the box with this graphic card. It is based on a completely new 12 layer PCB design featuring top-notch components and an amazing cooling solution. Sapphire Radeon HD 7990 Atomic’s PCB is equipped with a massive 18 phase VRM to provide stable power to the GPUs. The pair of 28 nm Tahiti XT2 GPUs are linked together through PLX PEX8747 PCI-Express gen 3.0 x48 bridge chip and feature a total of 6GB GDDR5 memory.
The 18 phase VRM is divided equally between the GPUs, each GPU makes use of 6+2+1 (Vcc+VDDI+MVDD). Sapphire has used two different kinds of chokes for the VRM power phases, the VCC (GPU Voltage) consist of two 50A chokes per phase and MOSFETs drivers while the rest of phases consist of more commonly used LFPAK MOSFETs. In order to provide clean, loss-less and efficient performance, Sapphire Radeon HD 7990 Atomic is equipped with Tantalum capacitors which are 33% more power efficient and are designed to handle high temperatures without compromising on performance.
The graphics card requires three 8-pin PCIe connectors which add up to a total of 450W TDP. Display outputs include six mini-DisplayPort connectors and it supports CrossFireX with any Radeon HD 7900 series GPU.
Sapphire Radeon HD 7990 Atomic Cooling Solution
There is not much to talk about in terms of the custom water cooling solution on the GPU yet but judging from the picture, Sapphire Radeon HD 7990 Atomic features a full-cover water block. It is identical to a custom water cooling loop we have seen in many rigs across the globe consisting of a 240mm radiator, pump+reservoir combo which fits in to the 5.25″ bay and 2 x 120mm fans for the radiator.