Is H81M-GV4 board 'usable' for overclocking an i5 4440?
No.
You need a z87 or z97 chipset board to overclock.
Also, any intel processor that is not a K series (like the i5-4690k) has a locked multiplier. This means you CANNOT overclock it the normal way by increasing the multiplier. Your processor falls into this, so you can't just overclock it like everyone else does. I'm not sure if you can overclock it with the base clock, but that's something most people don't want to mess with because if you change the base clock you change EVERYTHING such as QPI, memory, EVERYTHING, so it can lead not only to instability problems but other stuff as well like some data buses simply not working properly if you screw it up. Basically, unless you know what you're doing, stick to k-series processors for overclocking, so you're SOL.
Honestly, you're better off not overclocking and sticking to a budget i5 than finding an overclockable bundle for $250, because except for the G3258 you're limited to AMD. While their CPUs are more powerful overall for the money, they are less powerful on a single core. This means if your task is thread limited like most games, then AMD CPUs will actually perform worse because their extra cores and performance are not being used.
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