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Corsair 400CX enough for C2D-3GHz+HD5770 + 4 HDDs ?

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January 18, 2011 4:44:51 PM

Hi everyone!

I have a Corsair 400W PSU, Model: CMPSU 400CX

In its manual, it says, on +12V,
Max Load : 30 Amps
Max Output : 360 W

on +3.3V and +5V,
Max Load : 20 Amps
Max Output : 130 W (combined)

on -12V, 0.8 A and 9.6 W
on +5VSB, 2.5 A and 12.5 W

My question: Can this PSU handle a system with
Core2Duo E6850 3.0GHz
Sapphire HD5770
1 x DVD RW drive
4 SATA2 HDDs (320GB+500GB+500GB+1TB) ??

I already have 3 SATA drives on my C2D E6850 system which it handles with no problems. But i am planning to buy a Sapphire HD5770 and my 4th SATA HDD.

Please advise.
January 18, 2011 4:52:58 PM

Additional Info: I have done no Overclocking and do not intend to do in future.

Also, I am using 2 x 80mm Cooling fans. No water cooling.

I borrowed a Sapphire HD 5770 from a friend once and used it with my system for a couple of days with 3 HDDs, and at that time the PSU didn't give any problems. But haven't tried the setup with 4 HDDs.

PS. The OuterVision PSU calculator gives the result as 299W(recommended) and 249W(minimum) for my configuration.
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a c 266 ) Power supply
January 18, 2011 5:12:27 PM

The Corsair 400CX is a great little PSU and should handle what you listed just fine. It is actually underrated like all good power supplies.
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January 18, 2011 5:24:31 PM

Thanks. I am very cautious about PSUs and HDDs because my older, cheap PSU caused 2 of my HDDs to fail. Fortunately i was able to get them RMAed. I would really appreciate it if few more people could confirm what you said.
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a c 266 ) Power supply
January 18, 2011 5:51:48 PM

Read that whole page.

http://www.guru3d.com/article/radeon-hd-5770-review-tes...

"Our test system is a power hungry Core i7 965 / X58 based and overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results).

Our ASUS motherboard also allows adding power phases for stability, which we enabled as well. I'd say on average we are using roughly 50 to 100 Watts more than a standard PC due to these settings and then add the CPU overclock, water-cooling, additional cold cathode lights etc.

Keep that in mind. Our normal system power consumption is much higher than your average system.

Single GPU 5770

System in IDLE = 228 Watts
System with GPU in FULL Stress = 321 Watts
Difference (GPU load) = 93 Watt"

The card requires you to have a 500 Watt power supply unit at minimum if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 40 Amps available on the +12 volts rails"

http://www.overclock.net/ati/615215-400-watt-ati-5770-a...




The Corsair 400CX is a 500w PSU in everything but name. It will run a HD5770 fine.
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January 18, 2011 6:02:12 PM

Quote:
130/12=?

Guru3d recommends at least 40 Amps available on the +12 volts rails for that card.

So the answer to your question is NO

This one will do

SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

http://m.newegg.com/Product/Product.aspx?Item=N82E16817...


But this page : http://www.tomshardware.com/forum/279391-28-power-requirements-specs-popular-graphic-cards-guide says 30A on +12V is enough for 5770..

Also the TDP(Thermal Desighn Power) for 5770 is 108 Watts + 40 watts for 4 HDDs + 30 Watts for DVD drive + 63 Watts for C2D E6850. The total is 241 Watts. The +12 V rail provides 360 Watts. I might be missing something here.. so please advise.

Plus, I was able to run the system when i borrowed 5770 from a friend for a couple of days.. the only difference from then would be an additional Hard drive (my 4th) which i'd be buying with the card.
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a c 266 ) Power supply
January 18, 2011 6:09:42 PM

Amps are more important than watts. ATI and Nvidia assume you will have a low end power supply measured in peak power when they list requirements. The Corsair is mid-high end and is 400 watts CONTINUOUS not peak.

Also your old 6850 is not exactly a high end system. ( no offence)
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a c 266 ) Power supply
January 18, 2011 6:17:35 PM

Quote:
to both replies. Remember the 12v is getting shared by your video cards and other components while the cpu has its own 12v. That Corsair says 20A. Even if the system at guru3d was hungry there's no way that psu is going produce anything other than 20A. Tomshardware one says 30A. So clearly that Corsair is not enough



80+ Certified with 30A 12v rail.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Where you getting this 20A crap?
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January 18, 2011 6:23:40 PM

anort3 said:
Amps are more important than watts. ATI and Nvidia assume you will have a low end power supply measured in peak power when they list requirements. The Corsair is mid-high end and is 400 watts CONTINUOUS not peak.

Also your old 6850 is not exactly a high end system. ( no offence)


lol.. I agree that its is not a high end system (no crossfire, overclocking or extra cooling.. just midrange CPU with midrange GPU :)  ). I am just concerned about the high number of HDDs on my system.
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January 18, 2011 6:26:29 PM

Quote:
to both replies. Remember the 12v is getting shared by your video cards and other components while the cpu has its own 12v. That Corsair says 20A. Even if the system at guru3d was hungry there's no way that psu is going produce anything other than 20A. Tomshardware one says 30A. So clearly that Corsair is not enough


anort3 said:
80+ Certified with 30A 12v rail.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Where you getting this 20A crap?


Yes, as anort3 mentioned, my PSU has 30 A on +12 V rail.
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a c 266 ) Power supply
January 18, 2011 6:26:37 PM

Hard drives use about 8 to 10 watts each. Nothing to be concerned about.
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a c 266 ) Power supply
January 18, 2011 6:29:49 PM

WOW no wonder he thinks it won't power your system lol. Hes got a 1000w Corsair powering 1 GTX480. Can you say overkill for 2 x GTX 480s.
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a c 266 ) Power supply
January 18, 2011 6:31:34 PM

Quote:
click on specifications. You see that 20@ that's the 12v rail? You know what a rail is? Its a track monitored by a OCP chip that stops it from going over 20A. Then did you look at the combined the OP posted. 130w.



Yeah on the +3.3 and +5v rails look at the 12v rail.
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January 18, 2011 6:39:06 PM

Quote:
click on specifications. You see that 20@ that's the 12v rail? You know what a rail is? Its a track monitored by a OCP chip that stops it from going over 20A. Then did you look at the combined the OP posted. 130w.


I am not sure if using the word "combined" there was right. So, please refer this scan of the manual which should clarify any confusion.

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a c 266 ) Power supply
January 18, 2011 6:40:07 PM

Sorry for the flame war on your thread OP. My opinion is yes it will work fine. Maybe someone else who understands power supplies will weigh in.

^ Copy pasta proves?
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a c 266 ) Power supply
January 18, 2011 6:44:00 PM

Quote:
do you know what a XEON is?



Apparantly you think it's something that needs 1000 watts to run it lol/
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January 18, 2011 6:48:43 PM

anort3 said:
Sorry for the flame war on your thread OP. My opinion is yes it will work fine. Maybe someone else who understands power supplies will weigh in.

^ Copy pasta proves?


Its all right..lol. I too am optimistic about it working fine as i was able to run it when i borrowed the card from a friend and adding one more drive shouldn't make much of a difference. I think i am gonna go ahead and buy the card + the drive. Will report back when i have my system up and running.
Thanks for all your help.
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a b ) Power supply
January 18, 2011 6:49:02 PM

The CX400 with it's 30A is perfectly fine for a single HD5770. At full load a 5770 pulls 108W (9A). There's plenty of amps leftover, even if you take into account efficiency.

The 450W minimum that AMD claims to run a 5770 is to cover their a$$ for people who use crap quality PSU's. A Corsair 400W is better than a junk 500W PSU.
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January 18, 2011 6:51:36 PM

Quote:
Its 360w combined on the 12v according to that pic.

You already bought it. So I think there's not much of a use going on over it. Try it out and see if it holds up for long. Maybe it does maybe it don't. I surely hope it does


Yes, i already own that PSU. I mentioned that in my OP. The GFX card and 4th HDD is what i dont have yet. Anyways, thanks for your input. Really appreciate it. :) 
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a b ) Power supply
January 18, 2011 7:20:33 PM

Quote:
where did you see at full load it pulls 108w?

http://www.tomshardware.com/reviews/radeon-hd-5770,2446...

18w and 108w at idle where do you get 9?
Your link shows load at the outlet, whole system included.

I got the 108W load from the guru3d article you mentioned

and also from the Tom's link archeopterix posted: "Power Consumption at Full Load: 108 watts"

It's also mentioned here, here, and here

Pulling 108W from 12V is 9A current (108/12).
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January 28, 2011 10:34:46 AM

Best answer selected by archeopetrix.
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a b ) Power supply
January 28, 2011 7:25:33 PM

This topic has been closed by Mousemonkey
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