Is my r9 280x getting bottlenecked?

T4Gx

Distinguished
Oct 30, 2013
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BF4 Singleplayer everything maxed except for AA is at 2xMSAA I get 40-45 in open maps and only hit 60 in closed off CQC parts of the story.

Shouldn't I be getting steady 55-60fps throughout?

VaporX R9 280x at 1150/1630 through Afterburner.
Stock Fx6300.