The freezer 7 is okay for a little overclocking (read a bit better than the stock cooler) but I'm not sure that you'd hit 4GHz on it.
Graphics card wise I'd probably just swap out your current card.
RAM: The one you bought should overclock a bit, especially if you loosen the timings to something like 5-5-5-18.
Graphics card wise I'd probably just swap out your current card.
RAM: The one you bought should overclock a bit, especially if you loosen the timings to something like 5-5-5-18.