Could be. When I first got the server I updated the BIOS and BMC. It started out with 2 E5 2620v3,s. I later upgraded it to E5 2650v4's. The update was no problem at all. The 2650's run a little cooler than the 2620's did. Since I stumbled upon the ipmi commands to slow the fans down it become my favorite server. Cooling is more than adequate with the fans set to the lowest speed. Whoever decided to use double 80mm fans in this thing is an idiot. at standard speed they go wah wah wah wah at a frequency that goes right through walls. At the lowest speed you can barely here them at all and they don't go wah wah wah.Hmmm...I suspect you having the larger power supplies is what makes it work in a dual config.