AMD Trinity A10-5800K vs Intel Ivy Bridge i5-3470 - Discrete GPU Gaming Performance

Every other review site today will be harping on, and rightfully so. about how AMD's Trinity Radeon cores crushes the competition's HD2500/4000 in gaming graphics performance at a budget Core i3-ish price point. We at VR-Zone reckon that the average Trinity A-series APU buyer probably still has some aspirations in life, and a desire to play games smoothly on their Full HD displays. So what happens when we throw in a mid-range discrete GPU like the US$240 HD7870 (Pitcairn) into the mix? Will we see crippling CPU bottlenecks?