Question: Is 750W safe for 4070Ti and 7800X3D?
Question: Is 750W safe for 4070Ti and 7800X3D?
That's correct.
CPU shouldn't exceed 100W, GPU around 285W. Those are the most power-hungry components. You have over 350 watts left, so you could even opt for a 650W unit. However, a higher wattage device might prevent you from needing to upgrade your PSU, and since PSU capacity decreases over time, a 750W model with these components should likely last longer than the GPU.
If your PSU is a tier A and certified ATX 3.0 model - it's fine.
The PSU Tier List revision 17.0g from Cultists Network can assist you in selecting the optimal PSU among numerous options available. Whether you're looking at budget or premium power supplies.