CPU Bottleneck i5 3450 + R9 390 ?

[Juvion]

Hey guys,
I have fps drops in BF4 and Crysis 3 and I just noticed that it looks like I have a CPU bottleneck.. My CPU is at 85 to 95% usage most of the time and sometimes even gets to 100%.
In Witcher 3 I'm getting 65 to 90% CPU usage, depending on the location. (It runs fine)
How is that even possible? I googled "i5 3450 bottleneck r9 390" and saw lots of people asking whether their i5 3450 could be a bottleneck for a r9 390 and most people answered that the i5 won't bottleneck that graphics card.
I have already unparked my cores but it didn't help.
However, when I looked into my task manager, I saw something... odd.
My CPU is running with 3.29 GHz when I'm playing Battlefield and Crysis 3 although I didn't overclock it.
The only possibility I can think of, is that it is using Turbo Boost, which boosts the speed up to 3.5GHz. But here's the catch: It can only boost the power if max. 2 cores are utilised.
(Though, even then it should be at 3.5GHz and not at 3.29GHz if it is used to its full potential..)
Does that mean that I'm getting the bottleneck because my PC isn't using all cores?
I really hope that you can help me.. Thanks in advance!

Full System:
Sapphire R9 390
i5 3450 (4x 3.1GHz)
12GB DDR3 RAM
480GB Sandisk SSD
Seasonic S12-II 620W PSU

 

[clutchc]

Even w/o Turbo mode, there should be no CPU bottleneck with that processor. And yes, turbo mode will increase the clock speed of some cores depending on the load. It has to stay within the power envelope of 77W.

Frequency 3100 MHz
Turbo frequency
3500 MHz (1 or 2 cores)
3400 MHz (3 cores)
3300 MHz (4 cores)

But the cores that are not turbo boosted, will still be active and run at their default speed.
Do you have a lot of other stuff running while gaming?

 

[Juvion]

Even w/o Turbo mode, there should be no CPU bottleneck with that processor. And yes, turbo mode will increase the clock speed of some cores depending on the load. It has to stay within the power envelope of 77W.

Frequency 3100 MHz
Turbo frequency
3500 MHz (1 or 2 cores)
3400 MHz (3 cores)
3300 MHz (4 cores)

But the cores that are not turbo boosted, will still be active and run at their default speed.
Do you have a lot of other stuff running while gaming?

Oh okay, I didn't know that 😱
Nope, I deactivate all applications while I'm playing except for Skype and MSI Afterburner.
I even close the battlelog for Battlefield 4 while I'm playing it :/

 

[burgessanthony]

Having had that exact cpu and gpu I can say yes, in some games the cpu isn't enough. However, you can in bios take the bins to 39, 39, 38, 37 depending on ur mobo and that makes it much better. Just Cause 3 was one such game where cpu was hitting 99 and gpu 70 odd with fps drops.
Also windows task manager never reports proper clocks

 

[Sergeant_Sneaky]

Even w/o Turbo mode, there should be no CPU bottleneck with that processor. And yes, turbo mode will increase the clock speed of some cores depending on the load. It has to stay within the power envelope of 77W.

Frequency 3100 MHz
Turbo frequency
3500 MHz (1 or 2 cores)
3400 MHz (3 cores)
3300 MHz (4 cores)

But the cores that are not turbo boosted, will still be active and run at their default speed.
Do you have a lot of other stuff running while gaming?

Oh okay, I didn't know that 😱
Nope, I deactivate all applications while I'm playing except for Skype and MSI Afterburner.
I even close the battlelog for Battlefield 4 while I'm playing it :/

Try shutting Skype, it drops my fps by a fair bit when open.