new build trouble shooting

[sincerely frustrated]

Okay, so I built a new gaming desktop. The build worked perfect for about 2 weeks and then I noticed a heavy performance drop. I ran memtest 64 and found a bad ram stick. I rma through newegg and got my new ram. I installed it and everything seemed to work.

So here is the issue. When I initially built the rig, the games project cars and arma 3(single player) ran on ultra virtually flawlessly. Now on low settings I can barly get 30 fps on project cars and on arma with everything at medium and all anti aliasing settings disabled I manage about 15 fps.
However I can run the witcher 3 on ultra settings and get perfect gameplay. Which absolutly confuses me.

This is my build:
MSI Z97-Gaming 7 LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

MSI GTX 980 GAMING 4G GeForce GTX 980 4GB 256-Bit GDDR5 PCI Express 3.0 x16 HDCP

Intel Core i5-4690K Devil's Canyon Quad-Core 3.5GHz LGA 1150 BX80646I54690K Desktop Processor Intel HD Graphics 4600

G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2133 (PC3 17000) Desktop Memory Model F3-2133C10D-16GXM

Rosewill Hive-850, Hive Series 850W Modular Power Supply, 80 PLUS Bronze Certified, Single +12V Rail, Intel 4th Gen CPU Ready, SLI & CrossFire Ready

Windows 7 64 bit.

If anyone could help me figure out whats going on I would be so incredibly grateful.


Sincerely Frustrated

 

[IntelTurtleFan]

GPU drivers seem the likely cause. Re install them.

 

[sincerely frustrated]

GPU drivers seem the likely cause. Re install them.

Thank you for your response! I attempted the solution and re tested arma. It had the same crappy FPS. So what should I try next?