Okay, then, as long as you havent placed the memory in the wrong combination of slots, you're fine, you can check this by downloading CPU-z and and looking at the memory tab, the field named #Channels is the field of interest. Single is bad, Dual is what we are looking for.
Don't take this as a definite answer, but, based on my personal experience with a power-hungry AMD card (a Radeon HD6990), that might be your problem. From Cooler Master B700's official product page:
The reliable, efficient and premium line of B power supplies is ideal for mainstream and basic computing systems.
And that's definitely not the kind of machine you've built. So even if this isn't what's causing you these issues, you might want to consider upgrading to something like a Corsair HX850. Your whole case is extremely similar to what was happening to me a few years ago. I had built a new PC, and though Battlefield: Bad Company 2 and Mass Effect 2 ran just fine, it would underperform like crazy with most other modern games . for instance, whenever I looked at a big boulder on Borderlands it would stutter like crazy. Replacing my old PSU for the one I linked above entirely fixed it.
If I'm giving this person useless advice though, someone stop me.
I've never experienced a powersupply hampering performance, they either work fine, blow up or make the computer reboot.
you cant really buy a 850 watt psu with more amperage than a 900 ditto, since amperage translates directly into watt ( volt * amp = watt )
The coolermaster B700 has 660 watt's on the 12 volt rail.
according to techpowerup a 290 draws up to 245 watt
And Sweclockers system with a 4960 @4.4 GHz with a 290 drew 400 watt's at the wall.
Unless OP's sample is broken, it is definitely qualified to run his rig.
I'm personally running my i7 920 290x combo off a coolermaster M700 that i bought in 2008.
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