Yes all electronics have gold. It is only a thin plating on contact points. To collect one ounce of gold from electronic components, you would need about half a ton of cpus, PCI cards, cellphones, etc. Even the battery contacts and SD slots, along with SD cards are thinly plated in pure gold. What is more abundant in E-waste is palladium. Its worth refining if you have enough E-scrap. Palladium is worth $550.+ per ounce.