no i have not had any errors whatsoever

Remember that the system will throttle back the CPU when full speed is not needed, so what you've seen may not indicate a problem.  Slowdowns under load, however, could indicate a problem with overheating - ether a faulty fan or a heatsink clogged with dust that causes the system to throttle down the CPU.  Run a full Dell diagnostic (F12 at powerup) to verify the fan is working, and carefully check the heatsink unit for signs of dust accumulation and clean accordingly.

will do thx