I have purchased an Aerocool X-predator white case and i want to know a few things.
I will have a corsair h100 for my cpu and the radiator will be at the top of the case where the exhaust is. Is it worth me getting 2 x sythe 120mm fans to replace the stock ones?
I would think that a push/pull configuration on the H100 would be great (better performance) - I don't know that I would recommend scythe over any other fan maker but, sure, why not.
And is it worth me filling every fan spot in my case?
Usually not, unless you find that airflow is inadequate, then adding one or two more fans as needed.
My window lets me mount either 4 x 120mm fans or 1 x 200mm fan i was wondering if i should put fans there to increase performance or not and which setup if yes?
I will be overclocking my msi lightning gtx 680 and my i5 3570k.
Here you will want to add a fan - just so you have fresh cooler air available to your GPU - do you have to fill the spots? No, a single 120mm should be fine.