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2 12 volt rails

Post Date: 2009-08-05
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kainhall View Drop Down
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Posts: 264 		  Quote kainhall Quote  Post ReplyReply bullet Topic: 2 12 volt rails
    Posted: 05 Aug 2009 at 3:42pm
i have an antec 500w earth watts psu with 22 amps on both the 2 rails. however the 9800gt (hoping to buy soon) needs 26 amps. will i be able to use the card.
 
i hoping the amps will go over to the other rail. thanks
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skyR View Drop Down
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Posts: 2220 		  Quote skyR Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 3:48pm
Yes, you'll be able to use the card. The recommended voltage needed listed on graphic cards are for the entire system.
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kainhall View Drop Down
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Posts: 264 		  Quote kainhall Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 4:44pm
???? will it switch the power over to the other rail. your answer is a little confusing.
 
the volts are fine its just the amps that im worndering abought
 
thanks thow
 
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skyR View Drop Down
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Posts: 2220 		  Quote skyR Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 5:18pm
Sorry, I meant amperage and not voltage. The total recommended amperage is for the entire system.

Your motherboard and CPU is usually on one rail while the rest of your components are on the other rail. It doesn't share the rails.
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 5:30pm
The 9800gt pulls a max of 8.75 Amps, in stock form.
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kainhall View Drop Down
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Posts: 264 		  Quote kainhall Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 6:39pm
hum the requirments on the box of the card at the store said 26 amps and at least 400w
 
so will my 500 watt (has combined wattage of 408 so im good on watts) but the 12 volt rails are each 22 amps.
 
and i thougnt i needed 26 or 13 on each rail.
 
thanks a lot
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sdelu View Drop Down
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Posts: 304 		  Quote sdelu Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 6:49pm
he just explained that. the amp requirement (26) is for the entire system, not just the card.  The card (per justin) will pull max 8.75 amps. You will be fine.

skyR also said "Your motherboard and CPU is usually on one rail while the rest of your components are on the other rail. It doesn't share the rails."
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 6:54pm
look under the spec tab.
 
 
105 watts = 8.75 amps.
 
And the Mobo can supply around 75 watts through the PCIe slot, so there is some sharing of the power.
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kainhall View Drop Down
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Posts: 264 		  Quote kainhall Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 7:56pm

ok but why do they have the 26 amps on the box. this might make me (and others) confused so is the box wrong??
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skyR View Drop Down
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Posts: 2220 		  Quote skyR Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 8:34pm
The box isn't wrong, it's right in the fact that you need an minimum of 26 amperage to run a system with a 9800GT. This is the most simple they can make it as one of the reasons they do not list the minimum required for just the GPU is because of warranty reasons. No one wants to list that a 9800GT requires 120w and 8a because some smartass will try to run it on a 250W PSU and than blame it on the manufacturer.

Some PSUs come with a single 12v rail where all the components share the amperage. Whereas others like yours come in multiple 12v rails where one rail is dedicated to a group of components.
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MaceGoth View Drop Down
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Posts: 28 		  Quote MaceGoth Quote  Post ReplyReply bullet Posted: 05 Aug 2009 at 9:29pm
Look on the side of your PSU for the power disbursement breakdown. Look for the 2 12V rails and see how many AMPS combined they give, that will tell you if you can run the card or not.
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kainhall View Drop Down
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Posts: 264 		  Quote kainhall Quote  Post ReplyReply bullet Posted: 06 Aug 2009 at 4:43pm
all i have is both rails are 24 amps (only 2 short im sure i can run it) and combined there 408 watts.
thats all i have. its an antec earthwatts 500w
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 06 Aug 2009 at 5:21pm
you have way more power supply than the min. You are fine. lol
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kainhall View Drop Down
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Posts: 264 		  Quote kainhall Quote  Post ReplyReply bullet Posted: 07 Aug 2009 at 12:25pm
good because i just ordered a 9800gt of newegg for 40 bucks!!! WOOT.
and i tryed playing arma 2 demo today ol low every thing. it worked but there was a 1 second lag in the button presses. like when i move the mouse left it takes 1 second for the guy to move. really anowing. that is the gpu's falt right?
i have 2 gigs, vista, and 1.86 dual core
 
i love DS!!
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skyR View Drop Down
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Posts: 2220 		  Quote skyR Quote  Post ReplyReply bullet Posted: 07 Aug 2009 at 12:28pm
Delay issues aren't the GPU's fault. It's your internet connection or monitor.
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kainhall View Drop Down
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Posts: 264 		  Quote kainhall Quote  Post ReplyReply bullet Posted: 07 Aug 2009 at 5:37pm
well im playing offline. and my display has NEVER done this before.
 
and the only place im low in the requirments is the gpu. and if the gpu cand render the image then it was to pause, load the image and then send it.
 
i know it is the gpu.  i will tell you my results when i get my card.
 
thanks
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