Funnily enough, just last night I swapped out the wifi card on my Samsung RV511 to a 7260AC. It turns out it was the old Broadcom card that was stopping Windows 10 from installing on the laptop. I wanted the house working with Windows 10 all around for easier remote connectivity between devices, so it kinda had to be done. Was easy enough to do.
While I was in there though, I re-applied thermal paste to the processor / heatsinks, cleaned out the fan and heatsinks, doubled the RAM to 8GB, and fitted a SSD so overall, my 6-7 year old laptop now works much nicer. I also fitted a BluRay drive to it a couple years ago. I did look to see if I could upgrade the processor too while I was in there. But looks like about £50 for a quad-core for this machine, and after what I have already spent upgrading it, it doesn't look worth it for such old tech. Probably should get a new battery pack for it now though.