Bulldozer was contemporary with Sandy Bridge, not Skylake. Piledriver competed with Ivy Bridge and Haswell. The next Construction cores (Steamroller and Excavat

Bulldozer was contemporary with Sandy Bridge, not Skylake. Piledriver competed with Ivy Bridge and Haswell. The next Construction cores (Steamroller and Excavator) were only found in APUs, and not in desktop FX parts. Around the time of Skylake, AMD didn't have a meaningful presence in the desktop space. All they were selling was quad-core APUs based on minor revisions of Bulldozer, and the highly outdated FX-x3xx Piledrivers.