Sign in with
Sign up | Sign in
Your question

Is 32 amps enough for gtx 670 ftw

Last response: in Graphics & Displays
Share
May 30, 2012 12:33:57 AM

I read that the GTX 670 requires 30 Amps, but didn't realize that the EVGA FTW edition would require 38 Amps. Silly me.

My 500W CoolerMaster PSU is rated at 16 amps, on 2 12V rails, which puts me at 32 Amps. Would I risk damaging my system if I tried to install this card?

I have an OC'd Q6600 (at around 1.42V iirc), 1 HDD, 1 dvdrw, 6 fans, and 3 or 4 USB devices on my system.

Under full load (prime95) with a GTX 460 SE, my system draws less than 400W from the wall, just for reference.

More about : amps gtx 670 ftw

May 30, 2012 12:36:23 AM

it will not be enough. I wouldn't use it with even a stock 670 considering your cpu is Overclocked.

Also coolermaster is known to make bad PSUs.
m
0
l
May 30, 2012 12:39:10 AM

Ok, thanks for the input. FWIW, this PSU has served me well for the past 4 years. I was hoping I wouldn't need to upgrade until I got my new CPU/mobo, but oh well. Now I have an excuse to get a new 80+ PSU.
m
0
l
Related resources
a c 80 Î Nvidia
May 30, 2012 12:47:59 AM

I'd get a 850 watter so as not to need to do this again should you choose to do SLI....you could try and squeeze into a 750 but I'd be leery w/ a OC'd CPU and twin OC'd GPUs

m
0
l
May 30, 2012 12:50:00 AM

Thanks, that was gonna be my next question. From what I've read, the GTX 670's are pretty efficient, so I was leaning towards a 750 watt, but maybe the 850 would be more future proof.

Just curious, but what could happen if I did try to install this? Would I possibly fry the card?
m
0
l
Anonymous
a b Î Nvidia
May 30, 2012 12:50:53 AM

saige1r said:
I read that the GTX 670 requires 30 Amps, but didn't realize that the EVGA FTW edition would require 38 Amps. Silly me.

My 500W CoolerMaster PSU is rated at 16 amps, on 2 12V rails, which puts me at 32 Amps. Would I risk damaging my system if I tried to install this card?

I have an OC'd Q6600 (at around 1.42V iirc), 1 HDD, 1 dvdrw, 6 fans, and 3 or 4 USB devices on my system.

Under full load (prime95) with a GTX 460 SE, my system draws less than 400W from the wall, just for reference.

that is an outrageous claim!

even @ 200 watts (17 amps), the max on your PSU; i would not trust a cooler master to deliver that :( 

man 30 amps and some of you co-sighed that B.S? shame on YOU!
m
0
l
May 30, 2012 12:52:27 AM

The 670 sli should run no problem on a 750w high quality psu.

I'd say you would want 40+A for single 670 and 60+ for 2.
m
0
l
a b Î Nvidia
May 30, 2012 1:07:14 AM

You guys do realize that the GTX670/680 are the new GTX560TI cards right? These are the sub 200W cards, not the big 250W cards like the GTX480/580. As Looniam's chart shows we are talking about <200W. You don't need 40A or 600W to power a machine with a GTX670.

That said I wouldn't use a 4 year old CM PSU. Time for a new one.
m
0
l
May 30, 2012 1:10:39 AM

You could run a 670 off a quality 450w PSU, but unfortunately you unit is not the equivalent of a quality 450w unit. This would give enough power and headroom for anything short of a second card for a great price:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

If you want to add a second card later, go for a quality 750w something or other: Corsair, Seasonic, PCP&P, etc.
m
0
l
Anonymous
a b Î Nvidia
May 30, 2012 1:12:51 AM

EVGA GeForce GTX 670 FTW
Requirements
Minimum of a 500 Watt power supply.
(Minimum recommended power supply with +12 Volt current rating of 30 Amps.)
Two available 6-pin PCI-E power dongles

as in the benchmark i posted before the card draws 17 amps allowing 13 amps for cpu and peripherals.
(that q6600 will need that!)
CORSAIR Builder Series CX500 V2 $59.99
is your most cost effective (cheapest) option.
m
0
l
May 30, 2012 1:17:13 AM

4745454b said:
You guys do realize that the GTX670/680 are the new GTX560TI cards right? These are the sub 200W cards, not the big 250W cards like the GTX480/580. As Looniam's chart shows we are talking about <200W. You don't need 40A or 600W to power a machine with a GTX670.

That said I wouldn't use a 4 year old CM PSU. Time for a new one.

well to be fair, 40A is a 500w psu and I would recommend that to a 560ti as well. Especially considering he is OCing his cpu and his gpu will also at least be factory OC'ed.

Quality 450-500w for single card and Quality 650-700w for 2 seems to be about right.
m
0
l
a b Î Nvidia
May 30, 2012 1:18:52 AM

I am with the boat of not NEEDING 700-800 watts for that system.

My 5870 with a I72600K @ 4.4 has NEVER past 300 watts(thanks to just how good this cpu is for power consumption) at the wall.

Also it is a good idea to take into consideration efficiency. Higher efficiency power supplies will draw less from the wall due to the lower power waste.

Power supplies are rated in DC power so efficiency does not change the output power, just the input power required to make said output power.

If you have 32 amps(should be listed as a combined output[384 watts R1 + R2]. you can not always just add up rails since they normally get that power from one larger rail), you are in the range of most 400-450 watt power supplies, but after 4 years. the power supply may not still put out its full rated power. This being said, Cooler Master power supplies are sometimes unable to meet the label specs to begin with.

@ looniam, the EVGA link entertains me :)  AMD says I need a minimum of a 450 watt power supply for a 5770. It has been going for years on a 300 watt power supply.

m
0
l
Anonymous
a b Î Nvidia
May 30, 2012 1:26:59 AM

nukemaster said:
@ looniam, the EVGA link entertains me :)  AMD says I need a minimum of a 450 watt power supply for a 5770. It has been going for years on a 300 watt power supply.


:lol: 

i know i experienced much disdain using it since all OEM specs over compensate. but i could not find a specific power consumption benchmark. . . . yet, hardware canucks is down ATM.

i would believe that a FTW would not be much more than stock but i like to avoid conjuring numbers and needs from between my ears when possible. :) 
m
0
l
a b Î Nvidia
May 30, 2012 1:31:36 AM

Anonymous said:
:lol: 

i know i experienced much disdain using it since all OEM specs over compensate. but i could not find a specific power consumption benchmark. . . . yet, hardware canucks is down ATM.

i would believe that a FTW would not be much more than stock but i like to avoid conjuring numbers and needs from between my ears when possible. :) 

I notice that too. been like that for a while. The main page is working but many reviews are down :( 
m
0
l
May 30, 2012 1:31:46 AM

If OP's PSU lived up to what it advertises, it would be fine for a single card. Problem is that it failed in multiple tests at less than 350w DC. This is right around where OP said his system was sitting right now, so even though the 670 only pulls **20w** more than his current card, I'd say it's a great time to upgrade to a high-quality PSU.
m
0
l
May 30, 2012 3:52:23 AM

Wow, thanks for all the useful posts guys! I think I'll hold off putting in the 670 for now, while I wait for a deal on a good 80+ certified PSU.

EDIT: Ok, my toddler is finally in bed, so I got a chance to do more testing. I ran the EVGA stress test on my system and checked the kill-a-watt. I saw 336 max wattage being drawn from the wall. GPU was at 99% during testing, and I have it OC'd and set to 975mV.

From what I've been reading in this thread, I may be able to run my 670 tonight. Very tempting to try. I might underclock the 670 and lower the voltage a bit while I wait for that PSU deal...

Thanks again for all the help all!
m
0
l
a b Î Nvidia
May 30, 2012 7:11:38 AM

I don't remember what the GTX460SE draws. I'm sure its around 150W however. The draw of the GTX670 isn't much more then that. Downclocking and more important undervolting should allow you to add that GTX670 in while waiting. You won't get the full performance but it should be faster then that SE.
m
0
l
Anonymous
a b Î Nvidia
May 30, 2012 7:22:08 AM

4745454b said:
I don't remember what the GTX460SE draws. I'm sure its around 150W however. The draw of the GTX670 isn't much more then that. Downclocking and more important undervolting should allow you to add that GTX670 in while waiting. You won't get the full performance but it should be faster then that SE.

GeForce GTX 460 SE review
Subjective calculated GPU power consumption = ~ 160W

ya know as much as we all are ragging on that cooler master PSU, myself included, he just may get away with it FOR NOW

still it would be wise to upgrade it and keep the load light until then. no sense in taking out a whole system over $60 (the cost of a PSU) just to play with a $400 card.
m
0
l
May 30, 2012 9:20:11 AM

Have you tried using the psu calculator to check?
PSU Calculator

This would also include the usage of the other PC components. Then convert the wattage to amps then compare that to the total amps delivered by your PSU. Though I do think that coolermaster psu was not true rated. Might as well be safe and get a good 600w PSU.

And you don't want to run a PSU at 99%.
m
0
l
May 30, 2012 10:12:06 AM

A psu is most efficient at ~50% load.
m
0
l
May 31, 2012 2:31:43 AM

Just as an update, I put the power target to 95% and my system now draws under 300 watts from the wall, and runs faster than my 460 SE. Pretty amazing. Tempted to buy this PSU from newegg:

http://www.newegg.com/Product/Product.aspx?SID=vNj9EKrE...

Looks like mostly good reviews on amazon and newegg, and is only $67 after coupon and rebate. Might wait a little longer to see if I can find something modular since my PSU seems fine atm.
m
0
l
a b Î Nvidia
May 31, 2012 3:03:03 AM

masterjaw said:
Have you tried using the psu calculator to check?
PSU Calculator

This would also include the usage of the other PC components. Then convert the wattage to amps then compare that to the total amps delivered by your PSU. Though I do think that coolermaster psu was not true rated. Might as well be safe and get a good 600w PSU.

And you don't want to run a PSU at 99%.

The only problems with the psu calc is that it does not give you the 12 volt amperage. So unless you assume ALL power is from the 12 volt rail then it is not quite as good. Still better then nothing(and over the years has got much more accurate. I remember it giving numbers well over real world power use).

m
0
l
May 31, 2012 5:20:37 AM

^ Yup, I knew that the results weren't really accurate per se but at least you have some basis for comparison. :) 

And having some headroom might be more beneficial and cost-efficient on your part in the long run. :) 
m
0
l
a b Î Nvidia
June 1, 2012 12:23:47 AM

Can never have too much power :) 

40% more(then average power use) is my general rule, but its for efficiency more then anything as a power supply is more efficient loaded about 50-60 percent(or damn near peak for a passive power supply, but i don't have one of those.).
m
0
l
June 1, 2012 2:11:24 AM

most of the time you pc in idle which is when you want to be at 50% of your psu load. Generally if you want peak efficiency, you'd want the smallest psu that will run your system.
m
0
l
a b Î Nvidia
June 1, 2012 6:56:41 AM

Sort of. I mostly agree about buying the smallest that you need, you should add within reason. Also keep in mind that with 80 cert PSUs now the difference between idle and full load is nothing. 20%-50%-100% for 80Bronze for example is 80-82-80% efficient. This means idle (20% of PSU output) has the same efficiency as full load. So there shouldn't be much difference between idle and gaming.
m
0
l
Anonymous
a b Î Nvidia
June 1, 2012 2:22:20 PM

if this is anything about what size PSU to buy: i can't agree with the disciples of getting a PSU that is twice of the size of max load to run at the efficiency sweet spot.

too much time is spent at idle and often gets overlooked. PSUs lose efficiency running under 20% of load more so then at anytime running over 50%; so therefore the stress overtime will be greater and shorten its life expectancy.

getting a 700 watt PSU to run a 350 watt rig makes as much sense as getting an i7 to run diablo 3.
m
0
l
a b Î Nvidia
June 1, 2012 5:45:03 PM

4745454b, You do bring up a VERY good point. I am in the past and still tend to have too much power on most systems(better safe then sorry still). Even a 300 watt is too much for my media center that spends most idle time at under 40 watts(and thats at the wall maybe just over 50 in small peaks when using it to watch video).
m
0
l
June 1, 2012 7:38:40 PM

Having a headroom doesn't exactly have to be twice of the actual consumption. It may be a few watts more from what is actually needed. Honestly, I won't even try to go beyond 600w unless I'm really gonna stick with a multi-GPU setup for every build.

The oldest component in my setup was the PSU. Everything else were already replaced with a new one. At first I only got a stock dual core, 4gb ram, gts250 and 3 aux fans (what a cheapskate). I may be able to get away with just an earthwatts 380w PSU back then but I jumped the gun to get the hx620. Why? I do know that I would upgrade my system eventually after some years. Up to now, my PSU is still rock solid and very capable of running any of my builds.
m
0
l
!