TDP is Thermal Design Power - the minimum power the heatsink must be able to handle under worst-case APU load of the worst-case silicon lottery and worst-case ambient temperature to sustain normal operation. Unless you have the worst-case everything, you won't actually draw 65W except as limited-time boost or while overclocking a little. Typical power under typical load will be much lower most of the time.
My i5-3470 is a 77W TDP part according to the spec but actual package power reported by the VRM under full CPU load is only about 35W.
Your stutter in games may simply be due to the 2200g being a 4C4T CPU with only 4MB of L3 cache.
As for the fan seemingly dropping at the same time stutter is happening, that would imply a sudden drop in CPU usage. This typically happens when software runs into a dead-lock situation or when the OS is stuck waiting on IO. Bad memory can also cause stutters when corrupt data sends a routine on a wild goose chase without actually crashing it.