Specifications: Motherboard: 8 cards in-line PCI-E spacing 65MM Power Port: 6PIN*3, (6+2)PIN*8 CPU: Inter G640 RAM: DDR3 4GB Hard Disk: 128G SSD PSU: 1800W Mute power(176V-260V) Display Interface: VGA USB Port: VGA/2xUSB2.0/ 2xUSB3.0/ 1XNetwork Fan: 8*Fan(2500RMP-4500RMP adjustable speed) Chassis Size 27.9x17.3x6.8 Inch Warm Tips: 1.Please use a GPU less than 32 cm. The rig is compatible with a single power supply, please make sure your power supply is a single channel power supply. 2. If using a 1800W rate power supply: When you run the GPU overclocking, it is easy to burn the motherboard and power supply and GPU. It is recommended to use the GPUs under the rated power of the power supply. For example, when run the 3090/3080, 3090 rate power is 290W, the GPU overclocking power is about 350W. We recommend that you use 4 GPUs. Running 3070 and 3060 8 pcs is OK. Please reserve 300-400 W for other consumption. 3. Mining rig is a unit requires technology. If you have any technical issue, Please contact us, we will try our best to solve your problem. Mining rig problem determination: We have done a quick test before shipment. The rig will be slightly problematic, possibly due to long-term transportation and violent express delivery. When you get the rig, don't run GPUs immediately. Let's first test if the rig work. 1. Power supply troubleshooting Check the power supply to see if the fan is turning. 2.Motherboard troubleshooting Connect the keyboard to the computer, Press the Num Lock light on the keyboard. If the light remains off, the motherboard might be at fault. If the Num Lock light on and press again, the Num Lock light off, there is no fault with the motherboard.