Sufficient PSU for gtx 550 ti?

Shadowguy · Nov 23, 2013

I just got a gtx 550 ti for my ageing computer. I don't consider over clocking but I'm worried my PSU isn't good enough.

I have a generic psu with a weird brand, Penguin. It is a 500 w psu with a continuos total output of 500w (dont know what that means).
The specs:
+5v. +12v1. +12v2. +3.3v -12v. +5Vsb
28a. 18a. 18a. 26a. 0.3a. 2a
The combined power of +5v and +3.3v is 200w.
I've tried doing my maths, 500w-200w=300w
300-(5x2)=290. 290/12=24 1/6.
The required amps for the gtx 550 ti is 24amps but I have a feeling I'm doing something incorrect.
Is this PSU good enough to power the card? Thanks to anyone who has an answer

rolandzhang3 · Nov 23, 2013

What's the combined +12v rail amperage? that PSU should be enough to power a 550 Ti though

GhosT_Hv · Nov 23, 2013

Ya that PSU is enough actually but low branded psu can cause damage of hardware , so be careful.

Shadowguy · Nov 23, 2013

rolandzhang3 :

That's the problem. It doesn't indicate the combined amperage of the +12v rails. I don't want to ruin my whole computer when I test it so I. Just making sure.

rolandzhang3 · Nov 23, 2013

Well you don't directly add up the combined rails but it should provide around 30A or so which should have no problem with a 550 Ti

Why the 550 Ti though? you could get a much more efficient 650/7750 or even a 650 Ti/7770 which should put much less stress on your system

Shadowguy · Nov 23, 2013

rolandzhang3 :

I don't think it will do 30 amps in anyway because it's pretty old and the 5v and 3.3v take up a lot more than the new ones do. I chose the 550 ti because it was on sale. The 7750 was the one to go to before I chose this and I thought my psu was good enough to handle it until I researched a bit more.

rolandzhang3 · Nov 23, 2013

Ah that makes sense then, the requirement of 24A takes your other components into consideration as well so it should work

Shadowguy · Nov 23, 2013

I have another question. The graphics card came with a pcie 6pin to 2x molex 4pin. Will it work if I plugged one of the molex into a female molex on its own and the other into a female molex that comes off another cable which is plugged on the DVD drive?

rolandzhang3 · Nov 23, 2013

Not too sure about that, as long as the two molex cables you plug into are separate (and not daisy-chained together) it should be fine (no guarantees though), your PSU doesn't have a 6 pin PCI-E connector? that's a real shame :S

Shadowguy · Nov 23, 2013

rolandzhang3 :

Im not sure if the 2nd one is daisy chained or not. Do u mean the two molex are together or just one of them is with some other random cable. The 2nd molex cable isnt a separate cable though. There is a cable that goes into the DVD drive and the molex comes from the plug (the end) of it.

rolandzhang3 · Nov 23, 2013

As long as the two molex cables you are connecting to are separated from each other and not daisychained, it should be fine, though I'm not too sure about the DVD drive part

Shadowguy · Nov 23, 2013

http://www.google.com.au/search?q=molex+cable+coming+off+an+optical+drive&client=safari&hl=en&source=lnms&tbm=isch&sa=X&ei=OnqQUt2uKOaKiQfpmIH4Cw&ved=0CAcQ_AUoAA&biw=1024&bih=672#biv=i%7C5%3Bd%7CW2r7z6OFKwApIM%3A

rolandzhang3 · Nov 23, 2013

Well I guess it should be do-able since the two molex cables you'll be plugging into are not on the same connection/wire that leads back to the PSU (forgot the terminology off the top of my head derp)

Shadowguy · Nov 23, 2013

kristianAA :

Sorry but do you mean the cable is a 6 pin pcie to 2 moles connectors?
http://www.google.com.au/search?q=pcie+6pin+cable&client=safari&hl=en&source=lnms&tbm=isch&sa=X&ei=_Y6QUs6IHsmOiAfnqoC4DA&ved=0CAkQ_AUoAA&biw=1024&bih=672#biv=i%7C1%3Bd%7CwwNuFzYdqtEw2M%3A

Shadowguy · Nov 23, 2013

Ok, thanks. I was worried that my psu couldn't get the 24amps but apparently it can.

rolandzhang3 · Nov 23, 2013

Both rails will definitely be enough to supply 24A

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