I have similar Z840 but with the crappiest video card I could buy and stuffed with 512GB RAM. It sits in my basement and hosts some backend software that I wrote for the company I own. Amazingly quiet as well. Bought it for peanuts in specialized store close to my place. They do nothing but refurbish and sell servers and workstations. I bought mine for about 3,000 Canadian pesos. Works like a charm for few years already.