Constant fps drop even on very low settings for gta v - need tips

[OnoderaHaru]

Mobo - AsRock 970 Extreme4
CPU - AMD fx 9590 (5ghz)
GPU - Gigabyte Radeon r9 290x Windforce oc version
2 8x Patriot Ram
Thermaltake Smart 750W Bronze
500gb ssd

**V-sync off**
With everything on very high quality, I get around 30 - 50 fps. And every 15 seconds(Yes, every 15 seconds exact), it drops to 3 - 5 fps. I don't really care if I don't get 60fps, I just want to play it smoothly, on high quality of course.
With everything on low quality, I get 60fps but will STILL drop fps to 11.

I was told to crossfire it, but I don't really want to spend anymore money if possible. Any tips out there is welcome, thanks! I will answer back in 13 hours after work.
***FYI, my gpu/cpu aren't overclocked because I don't know how to do it***

 

[Supernova1138]

Your problem is probably your motherboard. It does not officially support the FX 9590 and its power delivery system probably can't take the 220+ Watts the chip needs to function at 5GHz. You're probably having issues with your CPU throttling due to the VRMs getting too hot. I'd say use something like CPU-Z to monitor your CPU clock speeds while playing, and watch to see if your clockspeed is dropping drastically when you get those drops. The CPU support list even recommends a cooler with a top down blower design to cool the VRMs when using the 125 Watt FX chips like the FX 8350. I assume you have a watercooler, or very high end tower air cooler mounted on your CPU, and those don't provide cooling to the VRMs.

If overheating VRMs are your problem, you have two options to fix the issue. The cheapest would be to underclock your CPU to get the power draw down to 125 Watts, dropping the clockspeed to the FX 8350's speed ought to do it. The other option is you get a new motherboard with a much more robust power deliver system and preferably built in VRM heatsinks, eg. one of the higher end 990FX boards, which I think are the only ones that officially support the FX 9590.

 

[OnoderaHaru]

I'll probably try and change my motherboard, it is a year older than my cpu.
I only have one watercooler and it's on my cpu. According to AMD Catalyst, after every long game, my gpu temperature stays up to 50C with only 25% fan speed.

I'll study on that underclocking and will report later on. And since you're talking about FX 8350, I still have my old cpu FX 8530, do you recon I try changing the cpu and see any difference before buying a new motherboard?

 

[Supernova1138]

The 8350 would be much less hard on your VRMs, though even then the CPU support list for your board recommended a top down blower cooler for that CPU to keep the VRMs cool.

 

[OnoderaHaru]

I've changed my motherboard as to what the internet said as best combo with my cpu. Everything works fine and well now. Thanks