I got some cards like R9 290, GTX 760 and GTX 780. I need a processor and motherboard for these cards. I will not use Crossfire/SLI. I just need to use one card at a time. I want to know about any cheapest combination for gaming.
A z97 and i5 4590 is the way to go then.
Or an FX 8350 along with asus m5a99fx.
If you go with FX you will need to OC the CPU to get performance equivalent to an i5 or i7. For which you'll need an good aftermarket cooler which cost you 60-100$ more. But you can manage for that later on.