[strike]What's your RAM make/model?
[/strike]
These APUs benefit greatly from high-speed memory. The faster the better. The problem is that they also use a memory controller that only goes up to 1866MHz.
While this clock is usually plenty fast enough for regular CPUs, the reason APUs benefit so much is because they lack the usual GDDR5 that accompanies the GPU on a graphics card. GDDR5 is quite considerably faster than DDR3.
What you'll need to do to increase this headroom is overclock the FSB. That's the base rate set by the board, but - It's tricky. It doesn't just overclock the memory controller, it overclocks almost everything else too. While you won't need a huge boost for 'said memory controller, even small figures can cause instability elsewhere if not cooled properly or in general - done right.
The other stepping stone is your memory itself. Keep in mind that manufacturers rate RAM at a certain frequency/timings out of the door based on their binning and/or heatspreader capability.
Buying a 1600MHz kit and whacking it up into the high 2000's is likely to cause some damage, for example.
You'll need to buy memory as close to your target OC as possible right out of the box. Unfortunately, with higher out-the-box clock speeds, comes higher price tags. Much higher infact.
You may also need a decent board since pumping more volts into the FSB will mean more volts through those caps and mosfets. A budget board may not handle it (and honestly, I don't know if there are any high-grade FM2 socket boards).
I would say you would gain a notable amount in performance increasing to just 1600MHz. Infact, your RAM is probably rated to that already, it's pretty rare to fine a 1333MHz kit unless it's super-budget. You'll just need to select the XMP profile in the BIOS - Easy as pie.
If it has it of course.
I wish you luck, but I don't think it's worth the extra cost of decent sticks/a decent board for an APU, even though it's a good one.
If you do overclock, I would say try not to push the memory volts over 1.5v.