Getting odd frame rates with multiple games?

GeekStories

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Dec 4, 2015
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Here is my build:
GPU: AMD Radeon R9 390 8GB GDDR5 (IDLE: about 60c, when playing a game about 70c)
CPU: AMD FX-6300 Six-core 3.5GHz (IDLE: about 30c, when playing a game 40c - 50c)
OS: Windows 8.1
RAM: 8GB 1600MHz (2x 4) DDR3
PSU: 700 Watt.

My problem is the frame rate in some games compared to others is really off. I can't figure out what the problem is. All drivers are up too date and my pc is clean, no viruses or Trojans or anything like that.

Here are some of the FPS I can hit in games with the above build.
BF4: Ultra, 60fps, 1920*1080 sp and mp
Fallout 4: Medium, 50fps - 60fps with dips as low as 15fps in some parts of the game.
BeamNG Drive: (one car) Highest, 60fps. (two cars) Lowest, 9fps max.
SimCity: Ultra, 20fps in the menus and roughly 60fps in game...

I don't understand the weird dips and changes in fps between higher end games and lower end games with my build. I don't know much about this stuff so any help is appreciated!
 

GeekStories

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Dec 4, 2015
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I don't see why it would be? v-sync just limits it to your monitors rate doesn't it? Even with v-sync turned off it still doesn't help performance wise.