Yes and no..... The proper way would be taking off the stock cooler by taking the pins out, you would need to get behind the mobo to do this..... or you can cut the pins and take out the stock hs, then you can install the HR05 without taking off the motherboard.... This is actually a safer way cos you dont risk scratching the mobo when taking off the pins whish is a pain in the ass...... only thing is you would need those pins if ever you have to RMA.......
Why not run your system out of the case before your hr05 comes in.....