If there's only an inch of space with the RTX 3070, the Ti might not fit. And, being longer, it could further decrease air flow inside this case, which is already an issue. The other issue is that NVidia recommends a 750W PSU for the Ti, which is 100W more than they recommend for the 3070. The G5 5000 has either a 350W or 500W stock PSU. Dell OEM video cards typically require less power than 'retail' versions of the same card so they can work with a smaller PSU. A retail Ti may be pushing/exceeding the limits of the PSU. The G5 5000 PSU is a non-standard design and -so far- there are no after-market replacement PSUs with higher wattage that will fit inside this case. Besides, video card prices have skyrocketed recently because of chip shortages, so is this even a good time to replace a pretty decent GPU? If you do replace the stock GPU, you'll have to disable Secure Boot in BIOS setup before swapping cards.
The 3070 ti is 10.5 inches in length. I believe this 3070 is 9.5, it looks like there's literally an inch of space left between it and the case. This case by the way, WOW! What. A. Piece.
Could I fit a RTX 3070 ti inside the G5 5000?