I'm building my first PC in the US and want to use a 4K 240Hz OLED monitor. I mainly play demanding AAA games and would like to experiment with ray tracing, DLSS or similar neural-rendering features, and some AI workloads. I understand that reaching 240 FPS at 4K won't be possible in every game, but I'd like to get as close as reasonably possible without wasting money.
I found a listing for an RTX 5090 priced around $400, but the specifications look suspicious: 32GB GDDR6, a 256-bit memory bus, and PCIe 2.0. I believe the real card uses different specifications, so I assume this listing is fake or incorrectly labeled. I'm also considering an RTX 5070 Ti 16GB, although I'm unsure whether 16GB of VRAM will be enough for long-term 4K gaming and AI-related work.
I'm confused about the rest of the build as well. What CPU would pair well with a 5070 Ti or a similar GPU? How important is the CPU at 4K, and would a Ryzen X3D processor be worthwhile? Should I choose 32GB or 64GB of RAM, a 1TB or 2TB SSD, and an 850W or larger power supply? I'd also appreciate advice about the motherboard, PCIe 5.0, and which parts I can save money on without noticeably reducing performance.
I'm new to PC building, so I'd appreciate a straightforward, compatible parts recommendation and an explanation of what matters most for a 4K 240Hz OLED system.
4 Answers
A 5080 could be a reasonable middle ground between the 5090 and 5070 Ti, while the 5070 Ti may offer better value depending on its local price. Another option worth researching is the Radeon 9070 XT, which can deliver strong 4K performance for less than some competing cards, although NVIDIA may be preferable if ray tracing, DLSS, or CUDA-based AI work is important to you.
A Ryzen 7 X3D processor such as a current-generation gaming model is a sensible pairing for this class of GPU, but you don’t need the most expensive CPU to play at 4K. A 2TB SSD is more convenient if you install several large AAA games, since modern game sizes fill a 1TB drive quickly. PCIe 5.0 is not usually a major gaming-performance upgrade by itself; prioritize the GPU, a good CPU, sufficient storage, cooling, and a reliable PSU first.
For a modern gaming build, 32GB of RAM is generally enough, so 64GB is only necessary if you regularly run memory-heavy applications, virtual machines, large projects, or demanding AI workloads. An 850W quality PSU gives a stronger safety margin than 750W for a high-end GPU. Choose a reputable, appropriately rated model rather than trying to save money on the power supply. At 4K, the GPU is usually the limiting component, so you don’t need an extreme CPU unless you also want very high frame rates in CPU-heavy games.
The $400 RTX 5090 listing is unquestionably a scam. A genuine card costs several times more, so the unusually low price is the biggest warning sign. The listed memory and interface specifications are also inconsistent with the actual product. Avoid buying expensive PC parts from marketplaces where counterfeit, misrepresented, or nonexistent hardware is common.
That helps. I may compare the 5070 Ti, 5080, and 9070 XT instead of chasing the suspicious 5090 listing.