CPU really hot (100c)

[the21robot]

Hi guys, I bought a used i5-2500k off of eBay a couple of dayz ago qnd installed it. Worked fine, so i didnt bother to check temps or anything, but fast forward to last night when i checked. 94 degrees celcius while playing dayz, 54-64 degrees idle. I dont know what the problem is. I have done prime 95, but i have opened the side of the pc open and put a fan next to it and im getting a max of 95 degrees. I noticed that my cpu fan only runs at 800 rpm, and the heatsink is a little small.(but the numbers are sooo high!)

[Silverer]

Re apply the thermal paste

[the21robot]

Re apply the thermal paste

Im think i did it fine, but did a shit job of cleaning

[Wauthar]

You're saying your heatsink is small, which one are you using?

[the21robot]

You're saying your heatsink is small, which one are you using?

stock

[SuperPug]

Reseat CPU heatsink.

[Wauthar]

stock

Yeah, try to reapply the thermal paste, make sure to clean the old one properly first. Are you sure you have plugged your fan into the CPU fan header on your motherboard?

[the21robot]

Yeah, try to reapply the thermal paste, make sure to clean the old one properly first. Are you sure you have plugged your fan into the CPU fan header on your motherboard?

yea, i can see all the rpm and everthing

[burnttoastnice]

800rpm? That sounds quite slow for a CPU fan while at max load

[the21robot]

800rpm? That sounds quite slow for a CPU fan while at max load

ik, and its 80mm

[the21robot]

if i turn off two cores, the temp goes down by 10 degrees.