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17A at 12v1 GTX 470?

Last response: in Graphics & Displays
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Anonymous
September 6, 2010 7:30:42 PM

Hello,
i knew my PSU was 550w.. and it says the GF GTX 470 requires a 450w.. so i thought i was fine.. but then it says it needs 32a at 12v ?

on my PSU it says 17a on +12v1...

how will my gtx 470 run? will it run at all?

help!

More about : 17a 12v1 gtx 470

a b Î Nvidia
September 6, 2010 7:32:37 PM

what PSU do you have?

usually when you see 12v1 there is at least a 12v2

can't answer your question without more info
Anonymous
September 6, 2010 7:43:53 PM

its a xilence 550w with the model no. XP550

it says 12v1=17a and 12v2=18a

hopes thats enough info?
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Anonymous
September 6, 2010 8:06:56 PM

any help? :( 
a c 161 Î Nvidia
September 6, 2010 8:20:27 PM

That PSU is not enough for a GTX470. Here is EVGA recommendation "Minimum of a 550 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 38 Amps.)"
Anonymous
September 6, 2010 8:25:44 PM

so my computer will run on the Motherboard integrated graphic unit or will my GTX 470 just run really bad?

any recommendations on what kinda PSU i would want if i wanna run 2x GTX 470 in SLI in the future?
a b Î Nvidia
September 6, 2010 8:41:06 PM

Your PSU *could* overload, explode and take out your Mobo and the GTX470.

For 2 470s, a quality 750W is the least you want to settle for.
a b Î Nvidia
September 6, 2010 8:45:38 PM

Quote:
so my computer will run on the Motherboard integrated graphic unit or will my GTX 470 just run really bad?

any recommendations on what kinda PSU i would want if i wanna run 2x GTX 470 in SLI in the future?


you can do serious damage to the PSU and video card, possibly other components

to run the GTX 470 in SLI


i would recommend an antectrue power, corsair, xfx, seasonic or corsair like one of these
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

September 6, 2010 8:53:08 PM

rolli59 said:
That PSU is not enough for a GTX470. Here is EVGA recommendation "Minimum of a 550 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 38 Amps.)"

17A + 18A = 35A. And they're talking total amps, not just what's available for the video card. 18A is right at the edge of what a GTX470 can draw. (See here.)

I'd venture to say it'd probably work considering how GPU manufacturers always slightly overstate PSU recommendations, but damn that's cutting it FAR too close for comfort. The risk definitely isn't worth it.
Anonymous
September 6, 2010 8:53:27 PM

but if 1 GTX 470 needs 38 A.. would 2x in SLI need 2x38=76A?

explode >.< thats not good.. another friend told me that the GPU just wouldnt run 100%.. but if it could explode i better replace it fast <.<
September 6, 2010 8:55:29 PM

Quote:
but if 1 GTX 470 needs 38 A.. would 2x in SLI need 2x38=76A?

explode >.< thats not good.. another friend told me that the GPU just wouldnt run 100%.. but if it could explode i better replace it fast <.<

No. See the chart I linked.
a b Î Nvidia
September 6, 2010 8:58:30 PM

RazberyBandit said:
17A + 18A = 35A.


17a+18a does not equal 35a...you don't combine amps to reach a total. in fact 17a + 18a is often around 30-32a depending on the total watts on the 12v rail(s)
a b Î Nvidia
September 6, 2010 9:00:42 PM

If the PSU isn't good enough then you should not install the GTX 470. That said I'm not so sure it isn't good enough. The power listing on the rails is secondary to the stated maximum power on the rails combined. This is usually listed on the chart below the amperages. The recommended requirements for video cards are always very loosely connected with reality. On its own at stock settings the GTX 470 tends to use approximately 180w(15a) under normal gaming conditions and 230w(19a) during stress testing. You haven't stated what the rest of your system consists of but it is quite likely your PSU would be fine and suggesting explosions are eminent if you try to use it is simply fear mongering and bad advice.
If you want to give the card a good overclock or if you would prefer to just get a new unit to be on the safe side and have enough juice for SLI in the future then this is a good deal and a good choice;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
a b Î Nvidia
September 6, 2010 9:01:06 PM

Quote:
but if 1 GTX 470 needs 38 A.. would 2x in SLI need 2x38=76A?

explode >.< thats not good.. another friend told me that the GPU just wouldnt run 100%.. but if it could explode i better replace it fast <.<


no. the 38a is for a system including your CPU, fans, HDD, etc., so a second GTX 470 would need a fraction of the 38a. It probably needs around 20a if not less.
Anonymous
September 6, 2010 9:02:59 PM

the chart shows watts. but currently the concern is amps?

anyways gonna get a corsair PSU tomorrow.. but how big do i need it to be in order to run 2x GTX470 in SLI?
a b Î Nvidia
September 6, 2010 9:06:33 PM

a 750w like the one i linked above is fine
a b Î Nvidia
September 6, 2010 9:09:14 PM

RazberyBandit said:
18A is right at the edge of what a GTX470 can draw.
Which is irrelevant as the card will be using both rails.
September 6, 2010 9:44:32 PM

Jy, how's that irrelevant? I simply stated that a 470 draws roughly 18A or so on it's own. I wasn't implying that the 12V2 would be solely responsible for powering it... (75W (or 6.25A) maximum through the PCI-E slot, 150W (12.5A) through PCI-E cable(s) covers an 18A peak draw, though.)

And ct, I know the actual output would be less than the two rails added together based on the actual peak-wattage output. I was simply stating that his PSU is almost there in terms of the total recommended power required - That despite the usual manufacturer overstatement, it's not far off. But I also said it's not worth the risk...

I just don't quite get why either of you guys cited me...
a b Î Nvidia
September 6, 2010 10:14:36 PM

no one jumped on you, just didn't want the OP to be misguided. plenty of cheap PSU state 20+a on 3x 12v but can hardly break 40a total.
September 6, 2010 10:23:40 PM

Didn't mean it to seem like I felt ganged up on or anything... Sorry. Was just looking for what I may have missed is all =)
a b Î Nvidia
September 6, 2010 11:48:25 PM

Quote:
And ct, I know the actual output would be less than the two rails added together based on the actual peak-wattage output. I was simply stating that his PSU is almost there


I'll jump on you. From how you wrote the your post, you said 17 + 18 = 35. This is just as bad as selling one of those "8GHz" CPUs that has four 2GHz cores. If you did know how to find the output, you should have listed it that way.

Not really trying to start anything, but if your going to write something out take the time to write it out correctly.
a c 161 Î Nvidia
September 7, 2010 3:40:38 AM

With the two rails at 17 and 18amps the total can be anywhere between 25 and 30amps which would not be enough for the GTX470 and the rest of the system.
!