Seasonic G 550w enough for 4770k@4.6+ 780 Classified?

starmanwarz · Nov 7, 2013

I have ordered a Seasonic G 550w to power my system

4770k@4.6
780 Classified
2 sticks of RAM
5 fans
2 HDD's+1 SSD
sound card

It is going to be enough? Should I cancel and get the 650w model instead? I probably won't be overvolting the card. I am reading that a similar system doesn't need more than 350-400 watts under full load?

http://www.guru3d.com/articles_pages/evga_geforce_gtx_780_classified_review%2c8.html

IAMEXTREME · Nov 7, 2013

That would be a bare minimum power requirement of your system.
You need 650watts psu for a room to breathe.

Someone Somewhere · Nov 7, 2013

Yup, you should be fine. Good high-quality PSU, though a little pricey for my liking - not much point in springing for Gold over a SeaSonic built Bronze XFX or similar.

starmanwarz · Nov 7, 2013

Thanks for your replies, although 1 of you is saying that it won't be enough and the other 1 is saying that it will be ok

IAMEXTREME · Nov 7, 2013

starmanwarz :

Your cpu is Over clocked to 4.6GHz and it's power consumption will be twice as compared the i7 at stock clock rates. GTX 780 is a very power hungry card.

Someone Somewhere · Nov 7, 2013

System Wattage with GPU in FULL Stress = 349W

Mind you that the system wattage is measured at the wall socket side and there are other variables like PSU power efficiency

That 349W measurement includes PSU inefficiency, so is probably somewhat less (more like 300W). Add 50W for the CPU being at load not idle, 50W for fans, and 50W for other stuff including sound card (really not necessary, but oh well) and HDD). That's 450W.

The G-series can deliver basically all their power on the 12V rail (540W, and that's likely just nice round numbers), so it's not going to be limited by being group regulated.

You're fine.

EDIT: Wait, a 4770K at 4.6GHz? How the hell did you manage that (or is that a target, and the chip is still coming? If so, you may be dissapointed). Add another 50W, which is getting close to the point where I'd suggest something bigger, or dropping the soundcard.

Traciatim · Nov 7, 2013

It will be fine, that machine would probably pull 380-400 watts, well within it's spec. 400 would put you at about 75% capacity where the general rule of thumb is you want to stick to under 80% for longevity and close to 60-70% for peak efficiency depending on the supply.

Though, newegg has a pretty good price on a 650 anyway... it's actually cheaper than the 550, so why not get that and then you're ready for any future upgrades without questioning power usage anyway. http://www.newegg.com/Product/Product.aspx?Item=N82E16817151118

I think IAMEXTEME is a power supply company shill, they seem to recommend new supplies to every single person that asks.

Lord_Kitty · Nov 7, 2013

Why don't you find out yourself?

http://www.extreme.outervision.com/psucalculatorlite.jsp

Spoiler: Its enough.

IAMEXTREME · Nov 7, 2013

http://forum-en.msi.com/faq/article/printer/power-requirements-for-graphics-cards
The GTX 780 requires a minimum of 600watt supply.

Someone Somewhere · Nov 7, 2013

IAMEXTREME :

I think you'll find that's the recommended total system power, not just the GPU. You can't do 500W in a single GPU. It would bake.

Also, those ratings are conservative and lawsuit-protecting. They're avoiding people buying a 500W Wonderpower that can deliver 350W on a good day. It's also a worst case scenario; i.e. a 3970X or similar.

starmanwarz · Nov 7, 2013

Unfortunately I can't buy from Newegg (I live in Greece)

The price for the 550 is 110 Euros and for the 650 is 150 Euros.

The whole efficiency thing is kinda confusing. Anyway I don't want the PSU to work overtime to support my system.

The CPU is already clocked at 4.6 with 1.3Vcore, could probably go higher if I wanted.

IAMEXTREME · Nov 7, 2013

Someone Somewhere :

But my friend,suppose the O.P plans to O.C in future. 550watt psu will choke him. For future proofing sake I recommended th 650watt supply.

Someone Somewhere · Nov 7, 2013

starmanwarz :

Yeow. Where are you buying from? I'll see if I can see a better deal there.

And I think 1.3V might be going a little hard on that poor 22nm silicon.

One other comment: Have you bought the 780 yet? If not, look into the 290 or 290X (though then you'll definitely want the 650W).

starmanwarz · Nov 7, 2013

Meh I guess I'm going to cancel my order and order the G650 instead.

Traciatim · Nov 7, 2013

IAMEXTREME :

They have to say that because they have to cover the el-cheapo supplies that are rated at 600 watts but if they had to actually supply 600 watts they would melt and the goo would drop all over the insides of your case. It doesn't mean the card actually needs 600 watts.

starmanwarz · Nov 7, 2013

Someone Somewhere :

The card is the only thing I haven't bought yet. It will either be the Classy or a 780ti.

1.3Vcore is kinda low actually, some are using up to 1.45.

IAMEXTREME · Nov 7, 2013

starmanwarz :

ABSOLUTELY!

Someone Somewhere · Nov 7, 2013

starmanwarz :

Someone Somewhere :

The card is the only thing I haven't bought yet. It will either be the Classy or a 780ti.

1.3Vcore is kinda low actually, some are using up to 1.45.

I don't think so... Not on Haswell, I believe. I'm fairly sure I've read in several places that running above 1.3V medium-long term is a recipe for pain and smoke.

starmanwarz · Nov 7, 2013

Someone Somewhere :

starmanwarz :

I don't think so... Not on Haswell, I believe. I'm fairly sure I've read in several places that running above 1.3V medium-long term is a recipe for pain and smoke.

Trust me, i've done enough searching and reading and it's perfectly safe

In other news, I just read some 780ti reviews, +50w power consumption so I had to cancel my order on the G-550, got the 650 instead.

IAMEXTREME · Nov 7, 2013

starmanwarz :

Someone Somewhere :

Trust me, i've done enough searching and reading and it's perfectly safe

In other news, I just read some 780ti reviews, +50w power consumption so I had to cancel my order on the G-550, got the 650 instead.

Welldone my friend

Someone Somewhere · Nov 7, 2013

OK, yes, the 780Ti and the highly OCed i7 are definitely too much for the 550W.

I still think that dropping either of those down would be fine for the 550W though.

Traciatim · Nov 7, 2013

IAMEXTREME :

Someone Somewhere :

I'm not so sure, HardOCP just reviewed the 780ti in a 4770k running at 4.8Ghz and the machine peaked at 410 watts from the wall. They used an 80Plus Gold power supply, so about 90% efficient. That means the power supply was actually supplying 369 watts when it was going full bore. That's still at 68.3% capacity for the 550 watt linked above, which puts it at right about the sweet spot for efficiency.

IAMEXTREME · Nov 7, 2013

Traciatim :

IAMEXTREME :

Someone Somewhere :

I'm not so sure, HardOCP just reviewed the 780ti in a 4770k running at 4.8Ghz and the machine peaked at 410 watts from the wall. They used an 80Plus Gold power supply, so about 90% efficient. That means the power supply was actually supplying 369 watts when it was going full bore. That's still at 68.3% capacity for the 550 watt linked above, which puts it at right about the sweet spot for efficiency.

They used a 3770k and Enermax MaxRevo 1350watt 80+ Gold supply for the rig!

Traciatim · Nov 7, 2013

IAMEXTREME :

Traciatim :

They used a 3770k and Enermax MaxRevo 1350watt 80+ Gold supply for the rig!

Yes, 3770k, my mistake. Also, yes, that's the 80 Plus Gold power supply... which might be slightly less than 90% efficient when it's supplying so little power to a machine, so the machien may have been actually using a little less than the 369watts I calculated above. Still well within the operation of the 550 watt supply in the OP.

IAMEXTREME · Nov 7, 2013

Traciatim :

IAMEXTREME :

Yes, 3770k, my mistake. Also, yes, that's the 80 Plus Gold power supply... which might be slightly less than 90% efficient when it's supplying so little power to a machine, so the machien may have been actually using a little less than the 369watts I calculated above. Still well within the operation of the 550 watt supply in the OP.

But my friend,suppose the O.P plans to O.C the 780 Ti in future. 550watt psu will choke him. For future proofing sake I recommended the 650watt supply.

Seasonic G 550w enough for 4770k@4.6+ 780 Classified?

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