I moved from Europe to the US and brought my Ryzen 7 5800X3D, RTX 4090, and 32GB of well-tuned CL16 DDR4 with me. I now need to rebuild the rest of the computer and am deciding whether to buy an AM4 motherboard and reuse my existing parts or sell the CPU and memory to move to AM5. DDR5 is currently expensive, so I'm wondering whether the performance increase would justify the extra cost, especially for 4K gaming. If I temporarily used a single 16GB DDR5 stick instead of a 2-stick kit, how much performance would I lose compared with my current 32GB dual-channel DDR4 setup?
4 Answers
A single 16GB DDR5 stick is not a good substitute for your current memory. One stick runs in single-channel mode, which reduces memory bandwidth and can hurt frame rates and smoothness in some games. You’d also be dropping from 32GB to 16GB, so newer games and multitasking could suffer. If you go AM5, get a matched 2-stick kit, ideally 32GB, rather than using one 16GB module.
For gaming, I’d stay on AM4. The 5800X3D is still a very strong gaming CPU and is competitive with plenty of newer midrange processors. Since you already own the CPU and RAM, buying an AM4 motherboard, case, power supply, and storage is much cheaper than replacing everything for AM5. At 4K, the difference would usually be even harder to notice because the RTX 4090 is more likely to be the limiting factor.
There’s no faster gaming upgrade within AM4, so moving platforms is only worthwhile if you need significantly better productivity performance or want a newer upgrade path. A high-end AM5 X3D processor can be faster in CPU-limited games, but the gains vary widely and usually aren’t close to an across-the-board 80% increase. Since your current system is already high-end, keeping it until memory and platform prices improve is the practical choice.
The main part you’d be reinvesting in on AM4 is the motherboard. Your case, SSD, power supply, and most coolers can also be used in an AM5 build, so don’t count those as AM4-specific costs. Even so, selling the 5800X3D and DDR4, then buying an AM5 CPU, motherboard, and DDR5 would still be a substantial premium for a relatively small gaming uplift with a 4090 at 4K.
I was hoping to upgrade rather than simply replace the parts I brought over, but the AM5 cost is hard to justify right now.
That makes sense. I mostly play at 4K, so I probably wouldn’t notice a huge CPU improvement anyway.