Is a 750-watt power supply sufficient for a 5070 Ti graphics card?
Is a 750-watt power supply sufficient for a 5070 Ti graphics card?
I owned a desktop with a top-of-the-line Seasonic 80 Gold Plus PSU (about eight years old) rated for 750 watts and 62 amps at 12V. Would this be sufficient for an RTX 5070 Ti or 4070 Ti Super? I'm using a Radeon 9 7900 with 65w CPU, 32GB DDR5 RAM, two SSDs, three HDDs, and an ATX case with four fans. Power calculators suggest a range of 650-750 watts would work, but I want to confirm it would function well in practice considering the PSU's age and reliability.
Is the model age eight years or more? I wouldn't depend on that PSU, especially given the hardware we're seeing in 2025, opting instead for a robust 850W unit with a standard 12V-2x6 connector.
The precise model is being discussed, but some users from that time reported problems with recent GPUs.
This Seasonic X-750 (SS-750Km Active PFC F3) has never experienced any problems!
Generally, to ensure the longevity and optimal performance of your PSU, it's advisable to keep its peak power consumption below 90% of the rated wattage. Personally, this seems a bit tight.
this power supply despite its age remains of high quality.
if you avoid overloading your cpu, it will perform well.
the power usage of the ryzen 7900 can nearly double in multithreaded tasks after adjusting the OC and PBO settings.
the rtx 5070ti will consume no more than 350-400w even with occasional spikes, and this is likely to be lower in practice.
thus, your power supply won’t operate at full capacity all the time.
additionally, seasonics power supplies are known for delivering more power than their rated value, though performance may slightly decline over eight years.
in conclusion, if you wish to be certain and have some margin, it’s wise to opt for a new high-quality 850w unit with a 12V-2x6 connector.
Despite my dislike for outdated discussions, encountering this while working elsewhere makes me feel compelled to challenge this suggestion. Others reading it later might be misled by what I consider poor guidance.
The advice to use a power supply likely at least 12 years old, possibly up to 14, with new hardware and possibly costly upgrades—regardless of its original quality—is not sound. This is particularly problematic for devices that, although functional in their early days, lack many modern features and safeguards. Even if they originally came with a 7-year warranty, it’s reasonable to assume the unit has been beyond its warranty for several years.
If the manufacturer believes a product is only reliable for a short period—say 3, 5, or 7 years—I won’t debate their claim. I’d likely agree that replacing it before that timeframe, especially if it’s been used heavily in demanding settings like gaming or high-end productivity, would be wise.
In short, I’d prefer to opt for a fresh PSU just to ensure the longevity and performance of new equipment. Even if a PSU remains operational past its warranty, its capabilities will likely have declined significantly, potentially affecting stability and efficiency. It’s safer to assume it needs replacement sooner rather than later.