cpu Should I Overclock Or Undervolt

[useffff]

I have a 4790k at 4.7Ghz on the core and 4.4Ghz on the cache atm. I was wondering since this chip has a stock clock of 4.0Ghz on the core and I think 4.0Ghz on the cache that I should just revert back to the 4.0 overclock and just undervolt the CPU. I want to upgrade my CPU at some point, mostly just when a new CPU generation comes out that is worthwhile for a big upgrade cause I will need to get a new Mobo, ram, and cpu. I was planning on using this pc in a low profile build when I go to college in 2 years, so would undervolting help preserve this chip? If I go from 4.7 to 4.0 really that big of a performance decrease cause I only edit video once a month and its very small and only render once a month. I basically only play games if that is worth mentioning on this PC. I want to bring this PC to college, I will mostly need it for writing code and such, so I dont need much power at all for that but I do want to at least play some games on the side.

[paddy-stone]

Leave it as is unless you've got too much heat/noise or voltage. Then if you transfer to a smaller build re-adjust then to stop overheating etc.

[AskTJ]

If it isn't thermal throttling and isn't producing too much heat, try turning the voltage down by 0.1 at a time, until it is stable at the clock speed you want.

[Jurrunio]

Do it when you have it into the small case you're talking about. CPUs are durable, so as long as cooling is sufficient they will outlast your motherboard.