I guess it was not worth it to pay an extra £100 for additional ~10/15 fps when I can do some light OC/tweak the options (reduce antialiasing/details) to push all the juice out from an old 970.
On a negative side, it's a blower type GPU, so there will be some noise.
The person who was selling it wanted £135 but I offered immediate payment for £100 and I also used £20 eBay voucher which was expiring tomorrow. I guess there are people who are not bothered negotiating, so I found one.