I currently have a PC with a GTX 1080 Ti and want to upgrade the rest of the system gradually. I can afford a motherboard, CPU, and RAM now, but I may not be able to buy a new graphics card for another year or two. I was considering a Ryzen 7 9800X3D with 16GB of DDR5-5200 memory, then upgrading to a GeForce RTX 5070 or Radeon RX 9070 XT later. Would the 1080 Ti work properly with that setup for 1080p gaming in the meantime, and would this be a sensible upgrade path?
3 Answers
The system will function, but buying a high-end CPU now and using it with the old graphics card may give you poor value because the GPU will remain the main bottleneck. If inflation and local pricing make waiting risky, buying the best parts you can reasonably afford now is understandable. Otherwise, saving for a complete platform-and-GPU upgrade could provide a much larger improvement, especially since newer CPU and graphics generations may be available in a year or two.
I would reconsider the memory choice. A single 16GB stick runs in single-channel mode, which is especially undesirable on an AM5 gaming system. If possible, get a 2x16GB kit, ideally DDR5-6000 with reasonable timings. If you already bought the 5200MHz stick, you can add a matching module later, but mixing memory kits is not always guaranteed to work perfectly.
I already bought the 16GB stick, but I have not purchased the CPU or motherboard yet.
Yes, the GTX 1080 Ti will work with that CPU and motherboard, and you can use it for 1080p gaming until you upgrade the graphics card. However, the 1080 Ti will usually be the performance limit, so the new CPU probably will not increase your average FPS much in GPU-heavy games.

I may need to buy sooner because prices are unstable where I live, and I am a university student with limited income. My plan was to secure the best platform I can afford now and save for the graphics card afterward.