PSU requirement for Sapphire R9 280X

yup, thats what we both just said, and no where did I say that a card alone draws 400W.

 

Lol...go play FarCry3 for 4hrs on high in DX11 then see if you still think like that.

OK, you saw your mates rig was "running OK" ...great, but doesn't mean it "will run OK".
Overworked PSU's often run just fine.......right up to when they shut down due to overloading, overheating, or overcurrent protection tripping.
Ofc that doesn't always happen either, it may be smaller issues like BSOD, constant reboots, slow post, freezing, lag or choppy fps while gaming.....artifacts.....things like that...without reaching critical mass.

PSU's can be good quality for different reasons, some are efficient, some have fantastic voltage regulation, ripple suppression, or maybe impessive continuous power output on underspec'd units.
None of this will help though if your asking it to to a job it wasn't designed for - he has a gaming rig not an HTPC..

To be honest, you've given your friend a rather mediocre PSU with inadequate power. Another point to note is he has no wattage headroom for upgrading in the future.

Silverstone do make great units as you said, but unfortunately this isn't one of them, it failed 80+ Bronze efficiency tests, has substantial droop under crossloading and uses Teapo caps.

Your mates rig is going to draw maybe ~400W in a decent gaming session, factor which means once heat and droop are taken into account your 450W SS will be constantly working at near 100% capacity.

PSU's work best and last longest when they have headroom, there is no set rule but 20% seems to be the generally accepted figure.....

If it was my mate I'd replace that PSU with something a bit more up to the challenge...maybe the ST55F or one of the new CoolerMaster GX units - they're pretty good now that Seasonic make them.....

Actually I just saw you're in Australia, which means AcBel is another option you should consider. Not the low end crap they make but the M8/R8 M9/R9. They are seriously good bang for buck, I own 3 of them oldest is 7yrs never missed a beat.

That's my 2.5c anyway.... take it or leave it....

 

Well, I saw this post, so I will ask here, 4 way Crossfire X with R9 280X Toxic will work fine with a 1200W psu like the Corsair AX1200i? or Sapphire Pure 1250W? Or I really need more? Like EVGA SuperNOVA NEX 1500? Also, which is the difference between the 2 evga 1500w? all seems the same except some letter and the 100 Price.

 

First can I ask why you want to run quadfire? Are u familiar with quadfire scaling?

 

I would much rather run 290 cfx than 280x quad, scaling after 2 gpus isn't great.

 

I tried running 2 290's on a 750w psu. Not a good idea.

 

Not that surprising given they draw something like 350W. lol. Props for trying though...

How is your PSU - recovering OK?

 

Yeah, but quad 280x will draw a lot more than dual 290

 

Think you missed the "not a good idea" part. lol

 

Easily, PSU i used to have powering an overclocked 7970 (which is now a 280x).

 

hi everyone,

i currently use a thermaltake smart 630w PSU. Could it handle a Sapphire R9-280x Toxic?


thanks.

 

Yes indeedy! If it was a garbage 630W PSU, I'd say no

 

I went through this a while ago I opted for EVGA 1300g2 love it never hear the fan I can overclock everything and never worry and it also has a 10 year warranty

I only need about 750 I figure why buy a new PSU and run it at 100% so I now run at about 50% I know I can upgrade in the future without worrying about my PSU

 

how about
Be Quiet! Pure Power BQT L8-CM-530W
would it work fine? I would also hate to replace my PSU

i have I5-4670
2 3,5 7200 RPM HDDs
blu-ray burner



I will use it to mine altcoins so it will be under heavy load, but I plan no OC