How long is it safe for an average PC to keep running? Without any impressive cooling. Since I had my new build, this is the first time that I have had it running for more than 24 hours. Right now its running for almost 4 days (exactly 4 days in about 5 hours). Im constantly monitoring temps via HW Monitor, so far they are okay. Temperature logs for the past 4 days in Celsius. (Min-Max) CPU = 39-52 Video Card = 37-70 HDD = 31-33 The above-mentioned components seem okay with those temps; however, its the other components without temp monitoring I am most worried about like my PSU, Motherboard, and RAMS. Well the PSU has its own fan but the mobo and rams do not. My case is well ventilated, i think. Front = 2x 90mm intake fans Side = 1x 120mm intake fan Rear = 2x 90mm exhaust fans Will I have any problems with the system going non stop for 4 days? Perhaps not now, but I've read of some horror stories about PCs that are working fine while they are turned on for a couple of days, but then the problems would occur after they have been turned off.