I'm hoping to build or buy a gaming PC for roughly $1,500 in the United States, possibly using the money from selling my current system. I've been using a GTX 1080 Ti for about four years and want a significant upgrade. The games I play include Rust, Rainbow Six Siege, Overwatch 2, Apex Legends, Arma, Dota, and Valorant. Rust is my main concern because it relies heavily on the CPU, and I'd like around 140–250 FPS at 1080p if possible. I've heard good things about the Ryzen 7 7800X3D and 9800X3D, but I'm open to other options that fit the budget. I already have peripherals, but I need a case and all the internal components. Looks are not important. I may sell my current PC to a friend for around $400, which would help increase the total budget.
4 Answers
For this budget, prioritize the complete parts list rather than spending most of it on the processor. A sensible target would be a midrange AM5 CPU, 32GB of DDR5, a 1TB NVMe SSD, a reliable 650–750W power supply, and a graphics card around the Radeon RX 7700 XT or similar. At 1080p, that class of GPU should handle your games very well, although Rust FPS will vary a lot depending on the server and settings. Check every part for compatibility with a build-planning tool before ordering.
Current memory, SSD, motherboard, and GPU prices make a high-end X3D processor harder to fit into a $1,500 build than it used to be. A complete 7800X3D system can easily approach $2,000 once the rest of the parts are included. If you need to stay near budget, consider a 7600X3D or 7500X3D bundle, 32GB of RAM, and 1TB of storage rather than cutting down to 16GB or buying an unnecessarily large SSD. A bundle from a nearby retailer or an online component-combo deal is probably your best value.
Your existing PC may be worth around $400 if it includes a reasonably modern CPU, motherboard, power supply, storage, and case—not just the GTX 1080 Ti. Since you said it still runs well and has newer core components, that price can be reasonable, but compare similar used systems locally before finalizing it. Selling it would make the new build much easier to afford.
A Ryzen 7 7800X3D or 9800X3D build may be difficult at $1,500 once you include DDR5 memory, storage, a graphics card, power supply, case, motherboard, and cooler. A Ryzen 5 7600X3D or 7500X3D would leave more room for the GPU while still delivering excellent gaming performance, especially in CPU-heavy games like Rust. If you can shop at a large PC retailer with bundle deals, you may save a few hundred dollars on the CPU, motherboard, and memory.

It was built about three years ago and originally used an RTX 2060 Super. I switched to the 1080 Ti because it performed better. The motherboard, CPU, and power supply are newer, and the system still boots and plays my games well. My friend is getting a working complete PC rather than just an old graphics card, so I think the price is fair.