u/Flimsy_Reflection_15

I think my PC is good; here are the specs.

Operating System

Windows 10 Pro 64-bit

CPU

Intel Core i7 5820K @ 3.30GHz	34 °C

Haswell-E/EP 22nm Technology

RAM

32,0GB DDR4 (15-15-15-35)

Motherboard

ASUSTeK COMPUTER INC. X99-A/USB 3.1 (SOCKET 2011)	31 °C

Graphics

ASUS PA328CGV
I (2560x1440@144Hz)

SDM-HS94P (1280x1024@60Hz)

SDM-HS93 (1280x1024@60Hz)

4095MB NVIDIA GeForce GTX 970 (ASUStek Computer Inc)	64 °C

Storage

238GB Samsung SSD 850 PRO 256GB (SATA (SSD))	36 °C

298GB TOSHIBA MK3255GSXF (SATA )	31 °C

1863GB Western Digital WDC WD20EFRX-68EUZN0 (SATA )	27 °C

1863GB Western Digital WDC WD20EFRX-68EUZN0 (SATA )	28 °C

Optical Drives

HL-DT-ST BD-RE BH16NS40

Audio

NVIDIA Virtual Audio Device (Wave Extensible) (WDM)  

Where can I spend my money to upgrade it a bit?

On the RAM and GPU side I have some bottlenecks.