1080ti card with old hardware

I have 9 years old pc, i7 860, motherboard: ASUS P7P55D-E EVO, Runing with 16GB DDR3 with old nvidia card Gainward GTS 450 and Corsair 650W PowerSupply .

The hashcat speed is very slow, around 350MH/S for bruteforce NTLM for example.

I was thinking to buy the Nvidia 1080ti card .
I was wondering if there will be any bottleneck or any other issues with my hardware ?

Thank you!
There is no bottleneck for hashcat in that setup. Enough PCIe lanes, enough ram and sufficient power for a 1080ti.