Should I Upgrade My PSU for a new 4070Ti Build?

[Gessler555]

I'm putting together a new system:

 

Core i5-13600K

MSI MAG Z790 Tomahawk WiFi

Corsair Vengeance 32GB (2x16) DDR5-6000

Corsair H100i Elite Capellix XT 240mm AIO

Samsung 980 Pro Gen4 500GB NVMe

2 x SATA SSDs, 2TB each

RTX 4070Ti

4 x RGB Case Fans

 

I currently have a 5-year old (2018 model) Corsair RM850x PSU (80+ Gold) in my old build and am wondering if I can reuse it in the new system?

 

My concerns are basically three:

 

1) Is 850W enough for the 4070Ti + 13600K? I know that Nvidia recommends only a 700W for this GPU but they often don't take into account things like efficiency, transient spike-induced stability problems & stuff like that.

 

2) As mentioned, my current PSU is from 2018 so obviously no ATX 3.0 or included 12VHPWR cable. Is it safe to use the 2 x 8-pin to single 16-pin adapter included in the GPU box? I gather that there are different manufacturers for these adapters and some may be better/worse than others?? I plan to buy either a MSI Gaming X Trio or Asus TUF Gaming OC versions of the 4070Ti.

 

3) If it's advisable to buy a Corsair-sourced adapter cable (which is much sleeker, I think you guys know which one I'm talking about), what model/year/rating should I watch for? Are those adapters compatible with older PSUs? I've been warned not to mix & match power cables even within the same manufacturer unless I'm absolutely sure what I'm doing.

 

A new Corsair HX1000i 80+ Platinum ATX 3.0 unit (with a direct 16-pin connection to the GPU) is within my budget and I can pull the trigger if you guys think the older PSU & Adapter solutions are not worth the hassle/risk. I just want to know if I'd be overspending for no good reason.

[TylerD321]

You would be able to reuse the psu just fine with no issues. It sounds like you just want a new power supply though. So just get a new one. 

[Queen Chrysalis]

No, it's more than capable.  Just use the adapter.  You'll be none the wiser other than the money you'll save.

[Somerandomtechyboi]

1 hour ago, Queen Chrysalis said:

No, it's more than capable.  Just use the adapter.  You'll be none the wiser other than the money you'll save.

The thing with psus is they either work or they dont work

 

When they dont work its either just straight up doesnt wanna turn on or shutdowns under full load, in which case yes you will notice a difference by replacing the psu cause your pc will be usable again

 

When they do work without issue you wont be able to tell the diff between units aside from power bills and those diffs will usually be pretty minor anyways so youd be pretty stupid to replace a psu that works perfectly fine as you wont notice any sort of diff when you uneccesarily "upgrade" your psu