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What is the best 850W PSU for an RTX 4080 build?

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Hey everyone! I’m finally putting together my new build featuring an RTX 4080, and I’ve settled on an 850W power supply as the ideal capacity. However, I’m getting a bit overwhelmed by all the different models available. I really want something that’s natively ATX 3.0 compliant so I can avoid using those clunky 12VHPWR adapters. Silence is also a big priority for me since my PC sits right on my desk, and I’m looking for a unit with great cable flexibility for easier management. I've been eyeing the Corsair RM850x and some Seasonic options, but I'm not sure which is the most reliable. Which specific 850W PSU would you guys recommend for a high-end 4080 build?


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I compared Corsair RM850e (2023) 850W ATX 3.0 (better value) vs Thermaltake Toughpower GF3 850W (more ports). Went with Corsair for the Cybenetics rating. Honestly, works well and basically silent!


5

tbh I just went through this same headache trying to find a deal for my build. I have been around the scene for a while but these new ATX 3.0 specs are pretty new to me so I had to do a ton of reading!!! I spent way too much time comparing brand spreadsheets to see who actually makes the internals. Its wild how much you pay just for a name sometimes... I ended up looking really closely at things like the Montech Titan Gold 850W and the DeepCool PX850G because they seemed like the best way to save money without getting a fire starter. I am not 100% sure on all the tiny technical details yet, but my research showed they basically use the same high-end platforms as the really expensive models.

  • Montech is usually way cheaper and still gets top tier ratings
  • DeepCool has some great native cables that are pretty easy to work with I basically decided that saving $30 or $40 on the PSU meant I could get a better cooler. Is it just me or are the big legacy brands getting way too pricey lately??? I dont know if I am missing something but the market seems to have some hidden gems if you look past the big logos.





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Just caught this thread. I went through a similar process last month when I was obsessing over Cybenetics data for my own rig. I was really happy with how the be quiet! Pure Power 12 M 850W turned out. No complaints on the noise front, even when my 4080 is pushing frames. Compared to some of the Seasonic options you mentioned, the be quiet! fan profile is much better for near-field desk use imo. I also helped a buddy with a Phanteks AMP GH 850W ATX 3.0 build recently. Both work well, but the be quiet! unit felt a bit more premium in terms of the internal component choice for the price point. Quick tips for ya:

  • Always double check that the 12VHPWR is pushed in until it clicks. Seriously, dont trust a visual check alone.
  • Try to avoid tight 90-degree bends right at the connector to keep the pins happy. lmk if you want the specific efficiency curves or load data, happy to dig it up for you.


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This^ Also wanted to add, definitely stick to a native ATX 3.0 unit like the previous poster mentioned. Ngl, those adapters are a total nightmare for cable management. Since silence is a priority, I would suggest the MSI MPG A850G PCIE5 850W. I’ve used it in a few builds lately and it’s basically silent even under load. Plus, the cables are way more flexible than the ones you get with the Corsair RM850e (2023) 850W. Be careful with the 12VHPWR cable tho—you wanna make sure you dont bend it too close to the connector. I mean, I've seen some horror stories about that. If youre willing to spend a bit more for long-term peace of mind, the Seasonic Vertex GX-850 is a beast and realy reliable, though it might be overkill. Just make sure to check the clearance in ur case! gl with the build 👍


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Yo, +1 to what was said earlier! Honestly, I was highkey stressed about my 4080 melting when I first built mine. I looked for the safest budget pick and found the MSI MAG A850GL PCIE5 850W. It's usually much cheaper than the MPG version or Corsair stuff. Basically, I think native cables are non-negotiable for safety, but ur wallet dont have to suffer! peace





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