PSU good enough for this video card? +5v rail is really used?

drago1 · May 23, 2013

Hello this is my first question, but Im a frequent reader..

I bought a computer with a Vitsuba Master Red Baron case, it came with a San-45-C PSU, it says 450w 'real' watts.. But it has 25A in the +5v and 18A in the +12v... The rest of the computer is:

Intel I5 3330
Gigabyte B75M D3V
1tb WD Caviar Blue sata 3
DVD 22x
8gb ram kingston 1333

Extras
(the Red Baron has two fans, one really big at a side, with leds, and a lcd screen at the front, and a memory card reader..)

Wireless keyboard and mouse USB
2.1 speakers USB

Currently using Samsung led 23 ls23b350 monitor

I want to know if I can install one of this cards without problems... I dont trust my PSU.. It even has a 6 pin pcie connector, but I wont put a card that needs one.. I think my computer its going to explode if I do that

So im looking for an Ati HD 7750 1gb ddr5.... Or an Ati HD 6670 1gb ddr5

I think they are the best cards with low power consumption, and they dont require a 6 pin pcie connector

The question is, is this PSU good enough?
I f I install one of those cards, I may have a problem?

The +5v rail, its useful or just the +12v is used?
Cause if only the +12v is useful then my PSU is just 216w..
And I need a little more, minimum 219w and 269w recommended according to the test I took at this page
http://www.extreme.outervision.com/psucalculatorlite.jsp

If the watts used are shared between the +5v and the +12v rail then Im going to be fine I think

But I want to ask you guys that you really know about this
Please help..

Thank you very much in advance

I will be visiting my thread every couple of minutes to see if I have some answers LOL

Someone Somewhere · May 23, 2013

I believe you are talking about a PSU (Power Supply Unit), not a UPS (Uninterruptible Power Supply; batteries so you can have power if the power goes out).

I would strongly suggest replacing that PSU - it's not a 450W. It's an over-rated 250-300W one at best. Look at the link in my sig for why.

drago1 · May 23, 2013

Someone Somewhere :

Yes I was talking about PSU and not UPS lol
(english is not my native language) Im sorry for my mistake, I will correct that so people wont get confused with the title

Right now Im reading the page of your signature, just watching those images scares me

Someone Somewhere · May 23, 2013

Yeah... To be honest, it's partly there for the scare value, those who say "My CrapTastic 700W $12 PSU is perfectly safe". It's moderately uncommon, but it gets the message across.

A decent 300W+ PSU is fine for that build, as you're using all very recent, power-sipping components.

Traciatim · May 23, 2013

Just as a point of reference I have a 3570k overclocked and a GTX 670 . . . measuring from the wall my power usage almost never goes above 310 watts. My power supply is 80plus bronze so at 85% efficiency my computer is actually using 263 watts on the delivered side.

If you take a look over at Anand's bench, they have a pretty beefy test rig and I believe their PSU is 90% efficient or so. Their peak wall usage was 216 watts with a 7750 which puts it at 195 delivered on the machine side. The 7750 is by far the better card of the two you linked, less power usage and way faster performance.

http://www.anandtech.com/bench/Product/613?vs=535

Though you are probably pushing it a bit on that supply, I think its' worth a shot to give it a try considering how low your power usage should be. If you install the card and notice things like random shut downs or restarting then replace the PSU with something new.

As to the question, the vast majority of the power usage will be from the 12v line. Though if even 10% is used on the other lines and you are already using less than 190 watts you should be well in to your PSU's rated capacity.

Someone Somewhere · May 23, 2013

Yes, but that's assuming his PSU can even deliver rated capacity. And chances are there won't be much load at all on 5V/3V3, except USB and a few controllers.

Traciatim · May 23, 2013

Someone Somewhere :

Right, which is probably 10 or 15% of the total power consumed, so since the anand test rig is using about 190 with a similar video card... 10 or 15% less would be 161 - 171 and the 12v line, which turns out to be about 80% of his rated capacity, and that assumes peak usage scenarios on more power consuming hardware than this one.

Someone Somewhere · May 23, 2013

Nowhere near even 5%.

CPU>12V
GPU>12V
RAM>12V
Chipset>12V
HDD>12V
DVD>12V

On other rails:
USB ports - max spec 2.5W each for 2.0. And that's if you are charging a phone.
3rd party mobo controllers - basically your LAN chip.
Few hundred milliwatts to running electronics in HDD/ODD

I'd say <2%.

Besides, that thing is a fire hazard anyway.

EDIT: Fans are also 12V.

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PSU good enough for this video card? +5v rail is really used?

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