I'm gearing up to upgrade my graphics card from a 3090 to a 5090, but I'm wondering what potential issues I might encounter if I just swap them without making other changes. My setup includes a Ryzen 9 5950X processor, an Asus X570 Formula motherboard, 32GB of Corsair RAM, a 2TB Samsung SSD, and a Corsair AX1500i power supply that's quite a few years old. I also have a Dell U3415W monitor that's about 10 years old, running at 3440x1440. It's a custom loop with Swiftech quick disconnects, and I'm really not keen on a complete teardown of my system.
So, what pitfalls should I look out for? Can I just use a PCIe adapter to go from PCIe to 12VHPWR? Also, since I've heard about potential overheating issues, should I water-cool the 5090, knowing it might void the warranty? My main uses are gaming, programming, and local AI/machine learning work.
5 Answers
One thing to keep in mind is the physical size of the 5090; it's huge! Make sure it fits in your case before you pull the trigger on the upgrade. My previous case couldn't handle the new card.
I appreciate the heads-up! I'll measure my case now.
Don't forget about your monitor! Upgrading to a high-refresh-rate screen could significantly enhance your gaming experience. A lot has changed in panel technology over the past decade, so exploring that could be a game-changer.
Absolutely! Higher refresh rates and better panel quality make a huge difference.
Thanks! I'll look into it, I've been stuck on this old monitor for too long.
You should be fine with the 12VHPWR since there are adapters available; just make sure your PSU has the necessary power to support the upgrade.
You might encounter some CPU bottlenecking, especially with your current 5950X. It should handle 3440x1440 fairly well, but it won't allow the 5090 to reach its full potential. If you can, think about upgrading your CPU too.
I agree, I had similar issues when I upgraded. The CPU really limited my performance.
Good to know! I might consider that upgrade later on.
If you’re just gaming at 1440p, the 3090 is still a powerful card. But if you ever plan to go to 4K or above, the 5090 is worth it. You might also want to look into undervolting the card for better temps and efficiency after installation.

Yeah, I ran into that issue when upgrading. Check your dimensions!