I have a 650 now do I need to upgrade?

1000w or better Super Flower Leadex platform (EVGA G2, G3, P2, T2 series).

 Its better to have more then you need then just enough! RTX 3090 Kingpin with 1000w rebar vbios  can pull  over 800 w GPU then you tack on what the cpu and everything else your over 1000 w.

jaredbyoung

alex063601
I have a 650 now do I need to upgrade?

You do need to upgrade.
 
Since you will be buying a new PSU I'd highly recommend going bigger than you need. I'd suggest 1000W or more. That's not because you need that to run a 3090, you don't. I just don't see power requirements going down over the next several generations, so you might as well get a good PSU, many have a 10 year warranty, that will work in your next build and possibly the one after that.

If you're getting a new PSU, you might as well just get a new everything :)

Minimum of 850 I would say.  I run a EVGA 1300 G2.  I've never had a single problem.

Since you are getting a new power supply, I would also go with 1000 or 1200 if possible.  PSUs are usually priced in groupings of wattage if you research the costs.  750 to 850 watt PSUs usually msrp for around $150-$200 and 1,000 to 1200 watt PSUs are around $250-$350 MSRP.  Highly recommend getting atleast a gold rated PSU or higher if possible.  
 
The actual minimum PSU you will need will depend on what your system needs now and what it might need in the next 5-7 years.  Most high quality PSUs are designed around a 10 year use life so that's why I would plan for that amount of time if your funding allows.  That would mean taking into account some possible upgrades you might have.  If the rumors are true about the 4000 series GPUs, they will be power hungry so if you were planning on getting one when they come out I would strongly recommend getting no less than a 1,000 watt PSU with the 1200 watt unit the better option if funding allows.  If you plan on skipping the 4000 series since you are getting a 3090, then even more so I would recommend the 1200 watt PSU since I really don't see power needs going down for GPUs in the future.  
 
I initially build my system around a 3070 so I went and got a gold rated 850 watt PSU thinking it would be enough.  Once I started upgrading I realized I would want a larger PSU to power my PC, so I picked up a 1200 watt one for my upgrade.  So basically because I didn't plan well initially, I spent $150 bucks on a 850 watt PSU that sits in my closet after being used for only around 5 months and I only use it now when I need it to cycle my open loop.  Could have used that funds on other things if I had planned better.  
 
 

Thank you everybody for your input

850

I would get nothing less than 1000w with a Platinum or Titanium rating period.

3090 often peaks at 500w, so I would say 750w as minimum. Be sure to get a named brand PSU such as Corsair, Seasonic, Silverstone, and etc.