Queries Incl Which x16 PCI Slot 4 GTX 1070Ti?

Thanks to Carsten's response (below), this matter, information-wise is RESOLVED and all original questions are now REDUCED to just two, printed here and answered -- as well as Carsten's informative answers to niw-deleted questions -- all are retained in this short thread, to aid other Newbies planning on upgrading or purchasing a host PC for Resolve 14.
Questions: I've a never-used, now-aging home built PC (ASUS P8Z-68-V PRO motherboard-based 3.4GHz Intel i7 2600K proc, 8GB EVGA nVidia GTX 1070Ti graphics card, Windows 10 Pro, 16GB DDR3 workstation (was actually intended as a Hackintosh build but never got around to it).
1) Which PCI x16 slot should I put the short-length Decklink Studio 4K for card in and
2) Which slot should I place the nVidia GTX 1070Ti graphics card in?
The system is intended for Resolve 14.3.
Answer to both: This motherboard's PCIe slots are Generation 2 and not PCIe Gen. 3 and are therefore too slow to realize the potential of the GTX 1070Ti.
Therefore, I should consider investing in a system upgrade involving an Intel motherbiard supporting Thunderbolt 3/ USB-C/PCIe Gen 3 (at least).
Thanks in advance for any solutions and ideas others might recommend especially for upgrading motherboard, CPU and RAM for use with Resolve 4K projects.
Cheers!
Peter
Notebook Host for Resolve Studio v14.3.0.014 | MiniMonitor | DTV 10.9.7: Win8.1 x64 Home, ASUS ROG G751JL, 2.8GHz Intel i7HQ, 24GB, 1TB HDD, 500GB EVO 850 SSD, 2GB GTX965M | Mackie MCU Pro | Softube Console 1 Mkii | Cintour Designs Shuttle Pro 2
Questions: I've a never-used, now-aging home built PC (ASUS P8Z-68-V PRO motherboard-based 3.4GHz Intel i7 2600K proc, 8GB EVGA nVidia GTX 1070Ti graphics card, Windows 10 Pro, 16GB DDR3 workstation (was actually intended as a Hackintosh build but never got around to it).
1) Which PCI x16 slot should I put the short-length Decklink Studio 4K for card in and
2) Which slot should I place the nVidia GTX 1070Ti graphics card in?
The system is intended for Resolve 14.3.
Answer to both: This motherboard's PCIe slots are Generation 2 and not PCIe Gen. 3 and are therefore too slow to realize the potential of the GTX 1070Ti.
Therefore, I should consider investing in a system upgrade involving an Intel motherbiard supporting Thunderbolt 3/ USB-C/PCIe Gen 3 (at least).
Thanks in advance for any solutions and ideas others might recommend especially for upgrading motherboard, CPU and RAM for use with Resolve 4K projects.
Cheers!
Peter
Notebook Host for Resolve Studio v14.3.0.014 | MiniMonitor | DTV 10.9.7: Win8.1 x64 Home, ASUS ROG G751JL, 2.8GHz Intel i7HQ, 24GB, 1TB HDD, 500GB EVO 850 SSD, 2GB GTX965M | Mackie MCU Pro | Softube Console 1 Mkii | Cintour Designs Shuttle Pro 2