HP Z400 upgrade

Hello everybody.

I have an old HP Z400 to improve a little for Premiere use. I use this workstation not so much so I'm not planning to change it.

I already upgraded CPU to 6-core Xeon W3690 and RAM to 24GB and mounted an SSD. Which graphic card could be a good choice for that configuration? I was thinking to buy a GTX1060 6GB; is a good choice or it's overkill?

Thank you

[Moderator  note: moved to best forum.]