Burnt Mark on the back of the CPU

[wildfiregt]

Hello
Recently replaced an i3 3220 with an i5 of same socket. PC is running fine.
But I noticed some strange burnt-like mark in the back of the cpu. See pics here (Zoom out to see it clearly)
http://www.zupimages.net/up/17/18/xzmr.jpg


The motherboard is a msi z77a-g45 and the i3 was working fine before i remove it.
What are those marks ? does it affect the performance or anything else ? Will the same thing happen to the i5 if it's related to the motherboard socket ?
Thanks

 

[James Mason]

dust possibly getting on the motherboard pins when you changed CPUs.

 

[wildfiregt]

Will this affect the performance ?

 

[James Mason]

Will this affect the performance ?

possibly, depends if it's cosmetic damage or not.
You can try like cleaning it with some Isopropyl alcohol and like a cotton swab/q-tip.

 

[wildfiregt]

Just used a cotton swab and now the marks are gone. Thx anyway