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Not enough amps...i think

Last response: in Graphics & Displays
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April 23, 2011 6:51:36 AM

here is my power supply http://www.diablotek.com/index.php?page=shop.product_details&flypage=tpflypage.tpl&product_id=33&category_id=37&option=com_virtuemart&Itemid=53


it says it has two +12 rails at 23amps

my graphics card is a 460 GTX

everything works fine until i start playing graphics intensive games, then the whole machine shutsdown instantly

everywhere i look it says you need +12 @ 24amps to run

BUT i also find that people say the card only pulls 13amps

so if i have two +12v @ 23A does that mean (making sure the card is running off both rails) the graphics card is getting 46A total?

More about : amps

a c 376 U Graphics card
a b ) Power supply
April 23, 2011 6:56:05 AM

Your link doesn't work. It is the combined rating of the two rails that matters, not the individual rating. What is the model number?
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April 23, 2011 6:58:25 AM

jyjjy said:
Your link doesn't work...


retry link
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a c 376 U Graphics card
a b ) Power supply
April 23, 2011 7:10:33 AM

Yeah, I'm not seeing any info on the combined amps for the +12v rails. If I had to guess I would have thought it would work but the brand isn't very good and the wattage may be highly overstated. It certainly does sound like the card isn't getting enough power under load from what you describe.
If the card has a factory overclock you may want to try setting it down to reference speeds/voltage(675mhz/1.025v) with a program like Afterburner.
http://downloads.guru3d.com/Afterburner-2.1.0_d2562.htm...
It may help the card work for now but I would really replace that power supply with something from a more respectable brand.
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April 23, 2011 7:21:07 AM

shoot, i didnt want to spend more but it seems like i should have done more research on my PS's

thanks for the help i am going to get a Thermaltake TR2 600W Power Supply i doubled checked everything and it seems that it should support my system.


(nothing overclocked its a end-user/gamer family PC)

i3-550 3.2Ghz

MSI H55M-E21 motherboard

EVGA 460 GTX 768mb

2x2gb DDR3 1333 ram

1TB Western Digital Green

DVD drive
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a c 376 U Graphics card
a b ) Power supply
April 23, 2011 8:19:23 AM

Thermaltake also is not a very good brand. They do have some decent units but they are high end and rather expensive. I believe the one you are looking at doesn't even have active PFC which is the first thing to look for in a PSU. Don't get caught up in the listed wattage of the PSUs. They are often outright lies. I would recommend something like this;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Antec is one of the best brands and their units are highly reliable. It is rated for continuous usage rather than peak like most and has 40a/480w on the +12v rail which is more than enough for your system.
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Best solution

a c 172 U Graphics card
a b ) Power supply
April 23, 2011 8:50:03 AM

if you want something cheaper from thermaltake hardware secrets reviewed the litepower and it actually got a good review. TR2's are known for not producing their rated power and ripple going out of spec when under heavy load, that being said your current setup shouldnt even be pulling over 50% of the psu's rated power so it should be ok. There are also many variations of the tr2, some are completely different designs. http://www.anandtech.com/show/2670/9
http://www.hardwaresecrets.com/article/Thermaltake-TR2-... 2 reviews of different models from the series, notice the very different conclusions
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a b U Graphics card
April 23, 2011 10:53:15 AM

(edit) Your setup: (/edit)
Minimum PSU Wattage: 346 W
Recommended PSU Wattage: 396 W

This is with 30% capacitor aging which is enough to run it 24/7 for a year and assuming you have 3 92mm fans and 3 extra usb devices

The other reason its an issue for you is that the minimum 12v rail power is 38A for that card. I know you said you were running both rails into it but it appears its not working like intended. Better to go with a single rail instead... simpler math.

This is what I'd recommend:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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a c 376 U Graphics card
a b ) Power supply
April 23, 2011 11:18:17 AM

You are really recommending a 750w $110 PSU for an i3 + a GTX 460?
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a b U Graphics card
April 23, 2011 11:28:49 AM

future proofing him a tad but not too much that he goes and blows his wad on a 1200w one. If he decides in say 6 months to upgrade his video card he will be able to get pretty much anything on the market still. Of course Id be a tad leery myself of putting a 580 on this motherboard but hey its his system.

[edit] also dont know what case hes got this in... if its a htpc or shuttle type case he might not be able to get a bigger card but thats an issue for him to solve. I mean hes using basically 350-400w now, might as well go up a level or two so he doesnt have to keep buying psus every time he wants to add something to his system.
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April 23, 2011 7:08:02 PM

Best answer selected by tvsocks.
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a c 172 U Graphics card
a b ) Power supply
April 23, 2011 10:48:02 PM

he really needs to figure out why the pc is shutting down. i suspect something is overheating. get hwmonitor to measure temps.
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a c 228 U Graphics card
a c 136 ) Power supply
April 24, 2011 2:07:32 AM

The card draws 127 watts .... should certainly be no great shakes for any 650 watter. Easy enough to tell. Run OCCT's GPU test monitoring both voltages and temperature. Should immediately determine which is the cause of your problem.
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a c 271 U Graphics card
a b ) Power supply
April 24, 2011 9:43:20 AM

This topic has been closed by Mousemonkey
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