EDIT----Hold on I will get back to you...
Okay after doing a bit of research, I would not install the RTX on this motherboard...this is a very old system and the motherboard is lacking and it would be hit or miss at best and with anything less than the i7- 4790 you will be bottlenecking the GPU and even the 4790 will be a bottleneck. Yes it can support PCIe GPU's with the right Power Supply's but the BIOS may not allow you to change to the new GPU.
I would just upgrade to the Ryzen 2600 (around $100), cheap B450 motherboard ($75), Cheap DDR4 RAM 2 X 8gb ($65) and you will have a much better system that can actually handle the RTX...