Honestly, its a bit of a toss-up and unfortunately neither choice feels perfect for $800 right now. I tried the NVIDIA GeForce RTX 4070 Ti Super 16GB GDDR6X thinking the newer architecture would save me, but I actually had issues with it stuttering on heavy 4K timelines once I started piling on the effects. That 16GB buffer is just... not as good as expected when you're doing professional client work and need to keep everything in memory. It feels like Nvidia is being super stingy with VRAM lately which makes life harder for editors. If youre strictly editing in Premiere, that 24GB on a used EVGA GeForce RTX 3090 FTW3 Ultra 24GB is basically the gold standard, but the power draw is insane and really jacks up the hidden costs. I had to upgrade my PSU just to keep mine from crashing, which sucked for the budget. Finding one for under $800 thats not been mined to death is also getting harder these days. If you can find a clean 3090 from a reputable seller, grab it. The extra VRAM is the only thing that actually stops those annoying Out of Video Memory errors when youre pushing heavy 4K exports. If you absolutely have to buy new though, the ASUS TUF Gaming GeForce RTX 4070 Ti Super 16GB is probably your best bet even if it feels slightly underpowered for those of us doing this for a living. Just keep an eye on your background apps because Premiere eats VRAM like crazy.

Regarding what #2 said about "Quick question before I get too deep into...", its the right call to check those first. If the rig is solid, i'd get the NVIDIA GeForce RTX 4070 Ti Super 16GB GDDR6X for the dual AV1 encoders.

• Better driver stability
• Lower power draw Buying a used EVGA GeForce RTX 3090 FTW3 24GB saves $100 for a Corsair Vengeance 64GB DDR5 kit, which helps timeline lag more than just a GPU swap.

Quick question before I get too deep into the weeds here... what kind of CPU and RAM setup are you currently rocking? Premiere is notoriously picky, and sometimes a GPU upgrade wont solve the stuttering if your processor is struggling to keep up with the de-bayering or if you're hitting a RAM ceiling first. In my experience over the years, I've tried many different setups for 4K workflows and there is definitely a trade-off here. If you are doing really heavy color grading or using a ton of noise reduction plugins like Neat Video, that massive VRAM on a used EVGA GeForce RTX 3090 FTW3 Ultra 24GB is basically a cheat code. I've seen 16GB cards choke on complex timelines that the 3090 just breezes through because of that extra buffer. On the flip side, the newer architecture has some perks you shouldn't ignore for a pro rig:

• Dual AV1 encoders on the ASUS TUF Gaming GeForce RTX 4070 Ti Super 16GB will make your export times way faster if you're moving to newer codecs.
• Much lower power consumption so you aren't turning your office into a sauna during long render sessions.
• Full warranty support which is kinda vital when your paycheck depends on the hardware not dying mid-project. Honestly, if you're mostly doing standard 4K h.264 or h.265 footage, the 16GB on a new 4070 Ti Super is probably the smarter play for the stability and speed. But let me know what codecs you usually work with and I can give you a better steer on which way to go.