Optimum PSU for FX-8320 / R9 270x system

[SilviuS]

Hello. It's my first post here, please be gentle.

I recently built the following system:

• 
  CPU - AMD FX-8320
  GPU - ASUS Radeon R9 270X DirectCU II Top 2GB
  MoBo - ASRock 970 Extreme4
  RAM - Kingston HyperX BEAST 8GB (2x4GB)
  SSD - Kingston SSDNow V300 120GB SATA-III 2.5 inch
  HDD - WD Blue 1TB, 7200rpm, 64MB, SATA 3
  Case - Zalman Z3 Plus (4 X 120 mm coolers)
  CPU Cooler - Master Hyper 212 EVO
  PSU - Sirtec ECO II HPE-450-A12S, 450W, ATX 2.3, PFC active

I also have the usual mouse + keyboard + 1 controller plugged in on the USBs.

When playing demanding games like Watch Dogs, AC4 Black Flag or GTA V, the FPS drops considerably, from 60 to 15-20, from time to time for about 5 to 10 seconds. Afterwards, it returns to the normal 50-60 FPS.
Sometimes pausing the game and returning to it can be used as a workaround.

The only thing I see that could bottleneck is my PSU that can't absorb the juice my CPU + GPU suck so I decided to give a shot at changing it.

What better PSU would you recommend for this system?

I did some research and decided on the Seasonic S12II-620 Bronze 620W.
I'm pretty sure the wattage is enough for my system. But do you think it's an overkill?

Or better yet, is the PSU not the problem here? Should I look somewhere else?

Any help here is appreciated.

Thanks in advance!

 

[toshaga]

You have picked a good psu and yes your old one is crap.

 

[SilviuS]

You have picked a good psu and yes your old one is crap.

Hey, thanks for your reply!

1. So the Seasonic is OK for my system, but do you think it's too much for it? BTW, I am considering OC-ing the CPU a bit in the near future.
2. Do you think the FPS drops I am experiencing can be caused by the lack of wattage my system gets, or should I investigate somewhere else as well?

Thanks.

 

[toshaga]

I think you got it right with the new psu and yes the problem could be from it but you will see anyway.
The psu you picked is tier 2 which is good.
When buying psu stick with tier 1 or 2. They are good enough for OC too.

 

[SilviuS]

Well, I don't want to buy it and see that the problem wasn't from the PSU, this is why I'm looking for different approaches to the problem.

If anybody else has another idea, I'm open for suggestions.

 

[toshaga]

Well, I don't want to buy it and see that the problem wasn't from the PSU, this is why I'm looking for different approaches to the problem.

If anybody else has another idea, I'm open for suggestions.

Well then you should make hardware tests before you buy the psu so you can be sure. Test the HDD, the CPU max temps, the RAM etc.
You can use different software to do that - memtest; hdtune; real temp ... And if anything is not in the norm it may be the problem. (if they are all OK, then the PSU is the problem)