The one thing that will surely ruin your servers reliability is adding more ram to it. Based on my relatively recent experience a server with 1TB ram will have

The one thing that will surely ruin your servers reliability is adding more ram to it. Based on my relatively recent experience a server with 1TB ram will have an MTBF of about 150k to 200k hours. Most of the failures (> 80%) are memory or memory socket related.