Remove "heatsinks" (aluminum/copper) and "batteries" from motherboards. Most buyers will downgrade your price if these are still attached because they add "dirty" weight.
For higher margins, list individual parts on eBay , Facebook Marketplace , or Craigslist . You’ll handle the shipping and buyer communication, but you can set your own price. who buys scrap computer parts
Do not mix your high-value RAM or CPUs with lower-grade power supply boards. Keep gold-fingered cards (like GPUs) separate from "motherboards" to ensure you get the higher rate for each. list individual parts on eBay