Bulldozer and Piledriver are AMD terms for their processor series, Bulldozer runs on Zambezi architecture, Piledriver runs on Vishera architecture (they're just names). Piledriver has roughly a 25% increase in processing power over Bulldozer, even though their base speeds aren't all that different. So, if you had a Bulldozer CPU running at 3Ghz and a Piledriver CPU running at 3Ghz, the Piledriver CPU would run faster, even though their base clock speeds are the same.
I would have to do testing on that, but my overclocked 6100 bottlenecks Fallout 4 and GTA. Granted, my bottleneck occurs when I'm hitting 40-50 FPS on average, so it's not exactly a huge deal, but it's still a bottleneck. That does not mean in any way that you won't be able to play it, you 100% will be able to play it.