I have an A-10 5800k along with an XFX hd6670 2gb...am I able to add another XFX hd 6670 with crossfire?...this is the first computer I've built....and I'm trying to figure out what my best graphics options are...I'm intending on using this as primarily a gaming pc...any help would be great...I'm still within my 30 day window to return my 6670 so that's also an optio
