750W or 850W?

[k0enf0rNL]

i'm planning to get the build in my signature(adding another gtx 780 later this year) but i'm not sure if i should get 750W or 850W. on another forum they said 750W is enough for my build. i dont want to get into trouble when i've added the other gpu.

[helping]

750 is enough.

 

if you're getting waterblocks and overclocking to tits then 850w.

[paulsterio]

i'm planning to get the build in my signature(adding another gtx 780 later this year) but i'm not sure if i should get 750W or 850W. on another forum they said 750W is enough for my build. i dont want to get into trouble when i've added the other gpu.

 

The price difference between a 750 and an 850 is usually so small that you might as well go with an 850. 

[k0enf0rNL]

750 is enough.

 

if you're getting waterblocks and overclocking to tits then 850w.

overclocking to 4,4 - 4,6 and overclocking gpu's too

[k0enf0rNL]

The price difference between a 750 and an 850 is usually so small that you might as well go with an 850. 

its about €30,- here in the netherlands.

[helping]

overclocking to 4,4 - 4,6 and overclocking gpu's too

as long as you're not doing BIOS/volt mods on the GPU's with them under water you're fine. 

[k0enf0rNL]

as long as you're not doing BIOS/volt mods on the GPU's with them under water you're fine. 

going to around 1,15V

[helping]

going to around 1,15V

as long as you're not doing BIOS/volt mods on the GPU's you're fine

[paulsterio]

its about €30,- here in the netherlands.

 

It's up to you then. I agree with @helping, 750W should be enough. However, for 30 euros, you're getting 100W more. You will have more headroom for adding things such as a hard drive. Alternatively, you're leaving yourself headroom to go with LGA2011. If you want to go with SLI, I reckon 850W is good. A PSU will last you a long time, you might even use it in your next build. 

 

Also, remember that running a PSU near capacity is bad for efficiency. 

[k0enf0rNL]

as long as you're not doing BIOS/volt mods on the GPU's you're fine

ow sorry. no i will just be using standard programs to overclock my gpu's. not doing anything in BIOS with my gpu's

[penance]

From experience I can tell you if you are going to overclock very much the 750 will not be enough for two GTX 780s had to bump from AX760 to AX860 to get mine to not crash.

[k0enf0rNL]

From experience I can tell you if you are going to overclock very much the 750 will not be enough for two GTX 780s had to bump from AX760 to AX860 to get mine to not crash.

there are some differences in your build. i got a i5 4670k instead of your i7 4770k and you got a pump for your watercooling.

[penance]

there are some differences in your build. i got a i5 4670k instead of your i7 4770k and you got a pump for your watercooling.

 

If those two items are what drive it over then you will be very close for comfort. Your talking maybe 10-15 watts difference between mine and yours. Additionally mine was doing this when I still had my H100i installed, which is what you show to have.

[BottleneckHunter]

I know that 750 is enough for now.. however, if you are looking to add more RAM, HDDs,SSDs, Liquid Cooling/OCing lights,Fans,More GPUs,ETC you might want to future proof. BUT things generaly go down in price in the future but i dont think PSUs are that liquid of a product soo something to think about. i would get the biggest you are comfortable with. Heck when you upgrade in the future rip this sucker out and put it in the new one.

[quan289]

there are some differences in your build. i got a i5 4670k instead of your i7 4770k and you got a pump for your watercooling.

 

I found his shutdown to be a bit questionable, TBH. His issue had been discussed here: http://linustechtips.com/main/topic/111072-is-750w-enough-for-my-rig-and-2x780s/

He stated that right before his system shut off, it was outputting 67A (804w) on the 12v rail and yet only drawing 620w from the wall (outputting under 600wDC). Essentially, those numbers are saying that it is a ~130% efficient PSU, where is it generating ~180w from nothing to. So this bring up the question of which figure is correct if any at all. There have been someone complaining about the +12v getting stuck at a high output even at idle in which the PSU tripping the overcurrent protection (OCP) as shown at OCN. The OCP of +12v on this unit is 74A in single rail mode as shown here, btw.

 

It is in my belief that his unit was defective, but if I were to assume that the 620w is more accurate, it would be more closer to Guru3D power figure of 617wAC with 780 Ti in SLI, in which the testing setup has an i7-3960X SB-E processor OCed to 4.6GHz. [H]ardOCP has shown a 590wAC power draw with a 3770k OCed to 4.8GHz. Of course, his 780s is overclocked.

__

 

You seem set on the RM series, but I'll provide you some other option in the price range you can consider. Seeing how you made a few post on this, I'll give you both 750w and 850w options for you to decide.

 

-Seasonic M12II Evo 750w

http://tweakers.net/pricewatch/353357/seasonic-m12ii-evo-750w.html

-Corsair RM750

http://tweakers.net/pricewatch/348557/corsair-rm750.html

- Seasonic M12II Evo 850w

http://tweakers.net/pricewatch/353358/seasonic-m12ii-evo-850w.html

-XFX Proseries 750w Black Edition

http://tweakers.net/pricewatch/341156/xfx-pro-black-edition-750w.html

-Corsair RM850

http://tweakers.net/pricewatch/348556/corsair-rm850.html

-XFX ProSeries 850w Black Edition

http://tweakers.net/pricewatch/362104/xfx-pro-series-full-modular-edition-%28gold%29-850w.html

 

Ehh, mostly Seasonic based units...How boring. Here's a Super Flower Golden Green 750w unit, if you don't mind semi-modularity.

http://tweakers.net/pricewatch/274628/super-flower-golden-green-sf-750p14xe.html

[k0enf0rNL]

I found his shutdown to be a bit questionable, TBH. His issue had been discussed here: http://linustechtips.com/main/topic/111072-is-750w-enough-for-my-rig-and-2x780s/

He stated that right before his system shut off, it was outputting 67A (804w) on the 12v rail and yet only drawing 620w from the wall (outputting under 600wDC). Essentially, those numbers are saying that it is a ~130% efficient PSU, where is it generating ~180w from nothing to. So this bring up the question of which figure is correct if any at all. There have been someone complaining about the +12v getting stuck at a high output even at idle in which the PSU tripping the overcurrent protection (OCP) as shown at OCN. The OCP of +12v on this unit is 74A in single rail mode as shown here, btw.

 

It is in my belief that his unit was defective, but if I were to assume that the 620w is more accurate, it would be more closer to Guru3D power figure of 617wAC with 780 Ti in SLI, in which the testing setup has an i7-3960X SB-E processor OCed to 4.6GHz. [H]ardOCP has shown a 590wAC power draw with a 3770k OCed to 4.8GHz. Of course, his 780s is overclocked.

__

 

You seem set on the RM series, but I'll provide you some other option in the price range you can consider. Seeing how you made a few post on this, I'll give you both 750w and 850w options for you to decide.

 

-Seasonic M12II Evo 750w

http://tweakers.net/pricewatch/353357/seasonic-m12ii-evo-750w.html

-Corsair RM750

http://tweakers.net/pricewatch/348557/corsair-rm750.html

- Seasonic M12II Evo 850w

http://tweakers.net/pricewatch/353358/seasonic-m12ii-evo-850w.html

-XFX Proseries 750w Black Edition

http://tweakers.net/pricewatch/341156/xfx-pro-black-edition-750w.html

-Corsair RM850

http://tweakers.net/pricewatch/348556/corsair-rm850.html

-XFX ProSeries 850w Black Edition

http://tweakers.net/pricewatch/362104/xfx-pro-series-full-modular-edition-%28gold%29-850w.html

 

Ehh, mostly Seasonic based units...How boring. Here's a Super Flower Golden Green 750w unit, if you don't mind semi-modularity.

http://tweakers.net/pricewatch/274628/super-flower-golden-green-sf-750p14xe.html

thanks for your response  

not quiet settled on the rm series. how about this one: 

Seasonic G-Series 750W

i would like to know if its very loud.

[penance]

I found his shutdown to be a bit questionable, TBH. His issue had been discussed here: http://linustechtips.com/main/topic/111072-is-750w-enough-for-my-rig-and-2x780s/

He stated that right before his system shut off, it was outputting 67A (804w) on the 12v rail and yet only drawing 620w from the wall (outputting under 600wDC). Essentially, those numbers are saying that it is a ~130% efficient PSU, where is it generating ~180w from nothing to. So this bring up the question of which figure is correct if any at all. There have been someone complaining about the +12v getting stuck at a high output even at idle in which the PSU tripping the overcurrent protection (OCP) as shown at OCN. The OCP of +12v on this unit is 74A in single rail mode as shown here, btw.

 

It is in my belief that his unit was defective, but if I were to assume that the 620w is more accurate, it would be more closer to Guru3D power figure of 617wAC with 780 Ti in SLI, in which the testing setup has an i7-3960X SB-E processor OCed to 4.6GHz. [H]ardOCP has shown a 590wAC power draw with a 3770k OCed to 4.8GHz. Of course, his 780s is overclocked.

__

As stated in that thread the unit was RMA'd and replaced and the issue still occurred, as the OCN article stated it was most likely corsair link misreporting the data. After having shutdown issues on two units both being AX760i's I still advise bumping up to the 850 or 860 watt psu's especially with the price difference not being that high.

[quan289]

thanks for your response

not quiet settled on the rm series. how about this one: 

Seasonic G-Series 750W

i would like to know if its very loud.

 

Audible noise isn't something that I look at often. The RM series is indeed more quiet than the Seasonic G series, but it should still be reasonably quiet, unless you are really sensitive to noise (I'm not...I got used to sleeping next to a LOUD ass window A/C. lol). If it was me, I would go for the SS G for the better component choices and performance. Of course, if you appreciate the feature set of the RM series, it may be an ok option for you.

 

As stated in that thread the unit was RMA'd and replaced and the issue still occurred, as the OCN article stated it was most likely corsair link misreporting the data. After having shutdown issues on two units both being AX760i's I still advise bumping up to the 850 or 860 watt psu's especially with the price difference not being that high.

 

Yes, I know. It's due to those inaccurate readings that BorisTheSpider of OCN had RMA'd his AX1200i, where both of his samples had shut down (his 1200w replacement did not). I'm just saying that the similarities between the two of you doesn't completely dismiss whether your system is able to be powered on a 750w or not.

 

So I would still say would be enough, as I know a people who powered it on a quality 750w with the 780s overclocked. If the OP wish to spend a little more for an 850w for a little piece of mind for possibly overclock harder than what he is telling us, then I'm not against him spending more on it. If he were to spend the extra money to get the RM850, my recommendation is to spend a little extra for the XFX ProSeries 850w Black Edition.

[helping]

As stated in that thread the unit was RMA'd and replaced and the issue still occurred, as the OCN article stated it was most likely corsair link misreporting the data. After having shutdown issues on two units both being AX760i's I still advise bumping up to the 850 or 860 watt psu's especially with the price difference not being that high.

So between an i5, and two 780's, where are all the rest of of those watts going? 

assuming the PSU isn't a turd or "meh" quality (760i and RM750 respectively) 

[k0enf0rNL]

i've got €40,- more to spend on a psu so i will be getting 850W. any recommendations for a silent modulair one?

[meritmaster]

Get a good 750 watt, and you should be fine.