MTBF Estimates for Intel® Server Board S3420GP
MTBF, Ambient Air Temperature, Air Temp at Board for 10oC rise
(hours) (oC) (oC)
137,000 45 55
165,000 40 50
263,000 30 40
335,000 25 35
Temp means everything, keep some decent home grade mobo bellow 20oC and mobo will live longer then it actually be useful.