Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

At 1080P CPU doesn't make a whole lot of difference to be honest.
http://www.guru3d.com/article/radeon-hd-7970-cpu-scaling-performance-review/1
I know it doesn't make that much of a difference to average frame rate but the minimum frame rates do show a difference.
It might also be worth selling the 920 now while it's still worth a decent bit of cash as it'll cost more months down the line to upgrade as you'll have to put more money towards the upgrade.
