I replaced my RTX 3070 with an RTX 5070 without changing any other hardware, and my system became noticeably sluggish. Games that previously ran well are now performing terribly—for example, Deadlock dropped from around 130 FPS to about 30 FPS. Programs also take noticeably longer to launch.
My system has a Gigabyte Z490 VISION G motherboard, an Intel Core i7-10700KF, and 32 GB of DDR4 memory. I used DDU to remove the previous graphics drivers and shader cache, tried both current and older drivers, adjusted fan and overclock settings, changed NVIDIA Control Panel options, increased the display refresh rate, and reseated the card in multiple PCIe slots. None of that helped.
Could the problem be related to the power supply, PCIe configuration, BIOS settings, Resizable BAR, or a defective graphics card? Is the CPU too old for the 5070, or should I investigate the storage drive and motherboard instead? I am considering reinstalling Windows and possibly switching back to the 3070. During troubleshooting, I also noticed that one fan is making a loud grinding or squealing noise.
4 Answers
A clean Windows installation is reasonable after the driver cleanup did not help, but make sure to install the motherboard BIOS, chipset drivers, and graphics driver in a clean order afterward. If applications still launch slowly on a fresh installation, test the system drive and memory and watch for unusual disk activity. Compare the 3070 and 5070 under the same game settings and monitor GPU utilization: a healthy 5070 should not perform dramatically worse just because it is paired with a 10700KF.
The card should be reseated firmly in the primary x16 slot, with its power cables connected directly and securely. Resizable BAR can be enabled in the BIOS, although it would not normally cause a 30 FPS result by itself. If the 3070 works normally when reinstalled, that is useful evidence pointing toward the new card, its power delivery, or compatibility rather than the processor. The damaged or noisy fan is also worth treating as a hardware warning instead of ignoring it.
A CPU bottleneck by itself would not explain a drop from 130 FPS to 30 FPS, especially when the same processor handled the older card properly. The more likely causes are a power or PCIe problem, a faulty card, an incorrect link configuration, or software instability. Check the GPU's active PCIe link width and speed with a hardware monitor, confirm that every required power connector is fully seated, and remove all overclocks or tuning software while testing. A fresh Windows installation can help rule out software, but it should not be the first explanation for such a dramatic change.
Since the entire system is slower, not just the games, check the power supply and storage as well as the graphics card. Monitor GPU usage, clock speeds, temperatures, CPU load, disk activity, and PCIe link information while a game is running. Try setting the motherboard's PCIe slot to a stable supported generation instead of leaving it on Auto, and check the motherboard manual for how the PCIe slots and drives share lanes. Also update the BIOS, chipset drivers, and motherboard firmware after reinstalling Windows if you go that route.
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