PSU supports GTX 780 with 3GB RAM but not GTX 1660 Super. What's the reason?
PSU supports GTX 780 with 3GB RAM but not GTX 1660 Super. What's the reason?
Hello. The title reflects the situation perfectly. Both cards function fully, yet my power supply seems to work only with the first one. My PC starts up about 1 out of every 3 to 4 times using 1660 Super. Sometimes it runs for a short period and then crashes into a black screen with the mouse flickering on and off. I’m really confused and need help. The GTX 780 uses more power and has two 8+6 connectors, whereas 1660 only has one 6-pin connector. What’s going on?
1660 shows a slight increase in power consumption. You haven’t provided any details to assist further. What is your power supply model? Which cables are connected to the graphics cards? Did you attempt to uninstall the 780 drivers using DDU? What steps have you taken to resolve the issue?
GTX 780 reaches its maximum around 220 watts, while the 1660 Super typically peaks near 120 watts. This might stem from how much power is drawn from power rails, especially if your supply has several rails. The GTX 780 usually gets most of its energy from additional connectors (150 plus 75 equals 225 watts) and perhaps 10-20 watts from the PCI-E slot, whereas the 1660 Super draws about 50-60 watts from the slot and the remaining from six-pin connectors. Because the 1660 is newer and more powerful, it can keep your CPU running closer to full capacity, providing more frames and potentially higher power spikes that your supply might not handle well.
New windows setup, latest drivers, BIOS refreshed. My main PSU is Silentium PC Vero M3 600W Bronze Semi-Modular. Brand new, just three weeks. Works flawlessly with the 780 3GB drive—no issues. At 1660, it powers on 1-2 times, then 4-5-6. Noteworthy, my backup PSU, the older OCZ Xstream 600 Semi-Modular, also functions perfectly with both units. It’s a model from over seven years ago.
It worked fine, though it was really rough. After five hours of stress testing and replacing several hardware components, the issue came down to updating the motherboard BIOS. It turns out I didn’t have the latest version. I had just one left before. I didn’t realize how crucial that would be. MSI-G43 appears to have a conflict. I was getting really frustrated. Thanks for the tips and support everyone!