Well seems there is something wrong, likely the PSU being faulty atm so the machine has only been up for 3 days since I got it built and been offline the last 2 days.

When I had it running though it was running a single client through Dal with everything (including shadows) maxed between 45-60fps (with v-sync on) through Dal in aussie primetime.

I'll likely drop shadows back off when it's back up and running and start to increase AA and AF as I prefer those to shadows.