Thank you guys for your answers. although
1st , sure I never think of changed the motherboard , I will upgrade the ram and processor, component can be upgraded.
2nd, I am not into OC the cpu for now so I will be satisfied with i7-2600k without oc since it will work like 2600 due to being similar in all specifications , so if I am right if there is no oc there no overheating than expected by manufacturer ?
3rd I am forced to buy this cpu cause it's almost the available model could be supported by my device, buying from ebay or similar in my poor country , mmmmmmmm they took huge money in customs and taxes , bla bla bla .