750W on a 3080 SuprimX

Tetras said:
What parts are you buying/using?
Click to expand...
  • MB - Gigabyte Z170XP-SLI
  • CPU - Intel Core i5-6600k
  • GPU - Powercolour Red Devil 5700XT
  • PSU - unsure on brand, but 700W is all I can tell you
  • RAM - 8GB (2x4GB) unsure on brand (DDR4)
PSU has gone bang I think so looking to upgrade, but this build (bar the GPU) is at least 10 years old, done me proud tbh over the years but need to look to bigger and better I think now.

First port of call is to get it back up and running again
 
mg3091 said:
  • MB - Gigabyte Z170XP-SLI
  • CPU - Intel Core i5-6600k
  • GPU - Powercolour Red Devil 5700XT
  • PSU - unsure on brand, but 700W is all I can tell you
  • RAM - 8GB (2x4GB) unsure on brand (DDR4)
PSU has gone bang I think so looking to upgrade, but this build (bar the GPU) is at least 10 years old, done me proud tbh over the years but need to look to bigger and better I think now.

First port of call is to get it back up and running again
Click to expand...
When gaming:
- i5-6600K around 50
- 5700 XT around 200
- motherboard around 30
- RAM around 3

RDNA is prone to power spikes though, so that doesn't mean buy a 300 watt PSU :o

650 should be fine. I usually suggest the Phanteks AMP 650 which OCUK have for £90, it is built by Seasonic, very well proven (loads of PSUs are based on the design), with a 10 year warranty.

Corsair's RMx 750 is £95.65, which is also well proven at this point, or Seasonic's GX-850 for £120.
 
Armageus said:
why?
Click to expand...
Probably because psu’s are generally at the best efficiency at half load.

That said you can certainly run a 3080 on a 750w, I even had 2 3080s running on my EVGA 750w during the mining boom with one full time mining pulling 220w while the other swapped between mining and gaming pulling either 320w or 220w so around 550w at peak times.
 
mg3091 said:
  • MB - Gigabyte Z170XP-SLI
  • CPU - Intel Core i5-6600k
  • GPU - Powercolour Red Devil 5700XT
  • PSU - unsure on brand, but 700W is all I can tell you
  • RAM - 8GB (2x4GB) unsure on brand (DDR4)
PSU has gone bang I think so looking to upgrade, but this build (bar the GPU) is at least 10 years old, done me proud tbh over the years but need to look to bigger and better I think now.

First port of call is to get it back up and running again
Click to expand...


Buy this, it's a bargain and will be fine:

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mg3091 said:
is there a simple way of finding this out? I've been told a Corsair RM650 will be plenty for my needs currently, and half the price of the RM1000 (almost)
Click to expand...

Just add up the individual power requirements of all your components and add about 15 watts for general motherboard use.
 
Even 650w would have been plenty for a 3080. 1000w is overkill for most builds. I know several people who power a 4090 off 750w no problem.
 
I've been running a 7900xtx and 5800x3d off a 750w 80+ gold rated PSU for a while now without issue so yep should be fine although I will probably upgrade to something with a bit more headroom at some point to be on the safe side.
 
Just to add further confusion, I don't belive the 80plus certification considers loads at under 20% IIRC.
So if you're like me and your gaming pc is also your work pc, the PSU probably spends 80% of the time at 10% load and under...

Part of the reason I chose a corsair RM last time was it's ultra low load efficiency credentials which you only realy read about in in-depth reviews.
Maybe something to bear in mind depending on your usage profile.
 
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