water cooled suitcase build needs the correct psu

[gezus101]

I'm going to stuff an i7-8086K w/ a GTX 1080 ti into a suitcase and water cool them both. I don't know how yet, but it's going to happen. The question is, do I get an 850w Platinum PSU with smaller dimensions or a 1000w Platinum PSU with larger dimensions? Will the larger PSU run cooler because it was built for a larger output than the 850w? I’m comparing the EVGA Supernova 850w P2 and 1000w P2. Cost isn’t an issue, but the size differences are and even more so the heat issues I’ll run into.

 

[379786]

PSUs are rated for wattages that they can reliably deliver, though they perform optimally at around half to three-quarters load. In your case, it seems an 850W P2 would be more than sufficient for the job, and I'd doubt it would get terribly much hotter than the 1000W P2 with your load. I'd go with the 850W P2 as it is both smaller for your case, and the upgrade to a larger PSU with a higher wattage will hardly make a difference.

 

[gezus101]

PSUs are rated for wattages that they can reliably deliver, though they perform optimally at around half to three-quarters load. In your case, it seems an 850W P2 would be more than sufficient for the job, and I'd doubt it would get terribly much hotter than the 1000W P2 with your load. I'd go with the 850W P2 as it is both smaller for your case, and the upgrade to a larger PSU with a higher wattage will hardly make a difference.

That's the answer I was looking for! I'll get the 850W. Save me some much-needed space! I don't suppose you have a recommended PSU for my purposes? I like EVGA so they were my first go-to, but I know SeaSonic is pretty good as well.

 

[379786]

The EVGA 850 B3 is a compact (160mm) and fully modular PSU that can be found on Newegg right now for $69.99 + $5.99 shipping with rebates and will come with a 7 year warranty.

Though another option, for $30 more at $99.99 + $7.99 shipping with rebates is the EVGA SuperNOVA 850 G3. This PSU will be more compact, at 150mm, is also fully modular, and comes with a 12 year warranty.

I'd recommend the 850G3, as you stated you were worried about heat. The B in 850 B3 stands for Bronze, while the G in 850 G3 stands for Gold. This relates to efficiency under load, with the Gold being certified to 90% efficiency under 50% load, and the bronze being certified to 85% efficiency under 50% load. The extra 10-15% will be converted into heat, thus the more efficiency, the less heat.

 

[gezus101]

The EVGA 850 B3 is a compact (160mm) and fully modular PSU that can be found on Newegg right now for $69.99 + $5.99 shipping with rebates and will come with a 7 year warranty.

Though another option, for $30 more at $99.99 + $7.99 shipping with rebates is the EVGA SuperNOVA 850 G3. This PSU will be more compact, at 150mm, is also fully modular, and comes with a 12 year warranty.

I'd recommend the 850G3, as you stated you were worried about heat. The B in 850 B3 stands for Bronze, while the G in 850 G3 stands for Gold. This relates to efficiency under load, with the Gold being certified to 90% efficiency under 50% load, and the bronze being certified to 85% efficiency under 50% load. The extra 10-15% will be converted into heat, thus the more efficiency, the less heat.

Yeah, that's why I was going with the Platinum. I think the next level (titanium?) isn't that much better for the cost difference. Thanks again for the input!

 

[379786]

Yep. The step from Bronze to Gold is a +5% in efficiency at 50% load, while the step from Gold to Platinum and Platinum to Titanium would be only a step up of +2% efficiency for each step up, and much less when the PSU is under a higher load. I personally don't think the additional cost is quite worth the additional performance.

I'm glad I could be of help, I wish you the best of luck with your build!