Do I need the 1U or 2U Universal Rails for the Dell PowerEdge R650?

To determine which U height you need, please refer to the weight capacity for each universal rail. The 1U-3U universal rails support up to 45, 75 or 200 lb (20, 34 or 91 kg) weight capacity. For the Dell PowerEdge R650, the weight is 46.7 lbs (21.2 kg), so you will need the 2U universal rail option.