cpu usage is around 3-6% if its mining at normal intensity (16-18)  for a 7950 at 9mh+ ( 50-60 gpu watts usage based on gpu-z), but if i lower the intensity to 9 or 10 its hashes at 0.9mh ( 15-25 gpu watts usage based on gpu-z ) with cpu usage shooting up to 50-60% usage on a intel g2020 dual core.

Are those 4 nodes on the official blockchain ? i don't know if there is a fork but i rather not start on 1 or start mining and create a fork instead. I don't really understand these things. I don't know why my wallet stop synced up to the blockchain.

If im not synced up to anyone and start mining  and if someone else who is also not synced start mining aswell, do we both create a different chain ? fork ? or we will be connected to each other

Sorry i'm a noob when it comes to these things.

Thank you kindly for your time.