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Power Issues with Dual Cards

Last response: in Graphics & Displays
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July 22, 2010 10:45:08 PM

Currently, I have a BFG GeForce 9800GT Graphics card, which (on the box) , recommends 350w. I am about to order a GTX 460 which needs 450w to run. I have a 500w power supply. Now I know I do not just add these values up to see how much power I need, there is power added to the recommendations for power for the rest of the system.

So bottom line is will my power supply manage the 2 cards, the 9800GT used for physics and the gtx 460 for everything else?
a c 196 U Graphics card
a c 276 ) Power supply
July 22, 2010 10:56:16 PM

Do you have one of the low power 9800GT's? What 500W power supply do you have? Depending on your power supply you might be able to do it but it might be a bit close.
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a c 172 U Graphics card
a b ) Power supply
July 22, 2010 10:59:21 PM

I doubt it. Just use the gtx460 on its own. Use the 9800gt as a spare or in another PC.
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a c 271 U Graphics card
a b ) Power supply
July 22, 2010 11:01:48 PM

A 9800GT uses about 115w and a GTX460 about 160w so depending on the rest of the machine and the quality of your 500w PSU, you may or may not be running it close. The possible need (depending on the version of 9800GT) for three six pin PCIe power connectors should be more of a concern though.
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a c 271 U Graphics card
a b ) Power supply
July 23, 2010 1:10:25 AM

yomammassson said:
I would not have a problem with the 6-pins because the 9800 is power efficient and doesn't use one. My power supply is the Antec 500
http://www.bestbuy.com/site/Antec+-+EarthWatts+500-Watt...

So 235w for your cards and 265w for the rest of the PC, you should be OK.
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a b U Graphics card
July 23, 2010 1:14:09 AM

I'd say 500 watt PSU should work to power both, but I'd also depend that on one more variable, antec aren't the most reliable PSU out there if its over 3 years i might consider a replacement; otherwise should work great, 460 is a great card and with a separate physix card should make for great resolutions :D 
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July 23, 2010 1:14:45 AM

I also have 1 more component thta you might need to know. I also have a Creative X-Fi Titanium sound card. Would that effect anything? Also, if i need more power than my power supply makes, would it damage my computer? I don't think it would.
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July 23, 2010 1:20:21 AM

g00fysmiley said:
I'd say 500 watt PSU should work to power both, but I'd also depend that on one more variable, antec aren't the most reliable PSU out there if its over 3 years i might consider a replacement; otherwise should work great, 460 is a great card and with a separate physix card should make for great resolutions :D 


My PSU is only as old as my 9800GT, so about a year and a half. If I run on the limit, would there be a greater chance of a short circuit or malfunction that may create a fire? Last thing I want :??: 
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a c 196 U Graphics card
a c 276 ) Power supply
July 23, 2010 1:20:39 AM

Nope, its power usage is minimal compared to the rest, you should be fine with the 460 and the 9800GT on an EA500.

Goofy what do you mean antecs arent the most reliable PSUs out there? Most of their units are quite good, the earthwatts are a bit cheaper but still good. Were you thinking about the older basiq units?
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July 23, 2010 1:35:12 AM

hunter315 said:
Nope, its power usage is minimal compared to the rest, you should be fine with the 460 and the 9800GT on an EA500.

Goofy what do you mean antecs arent the most reliable PSUs out there? Most of their units are quite good, the earthwatts are a bit cheaper but still good. Were you thinking about the older basiq units?


What about my second question on overhaeating and short circuiting danger?
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a b U Graphics card
July 23, 2010 2:32:04 AM

hunter315 said:
Nope, its power usage is minimal compared to the rest, you should be fine with the 460 and the 9800GT on an EA500.

Goofy what do you mean antecs arent the most reliable PSUs out there? Most of their units are quite good, the earthwatts are a bit cheaper but still good. Were you thinking about the older basiq units?



well i've had two antecs blow on me, one, a 350 watt basiq running just a media pc pulling about 200 watts MAX blew in about 4 months, took the mobo with it, i chaulked it up to bad luck and threw another antec in the rebuild, and it lasted about 2 years then started blinking in and out so i replaced it again , that was a decent antec i believe a 600 watt; i should preface that with being in florida we get very dirty electricity here and alot of storms, so even though i use a UPS still with it storming most days, but I've found corsairs and ocz last the longest in these conditions. , i stil replace my psu every 2-3 years now though ... to many blown systems
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July 23, 2010 2:38:02 AM

Can you guys please answer my question?
Another one too, If my PSU blows, will it always take out the mobo?
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Best solution

a c 196 U Graphics card
a c 276 ) Power supply
July 23, 2010 2:42:08 AM

Its strong enough you shouldnt be running it too close to max load, probably only 80% or so under full load, so you wont run a risk of overheating. Chances of a random short circuit malfunction are very low, chances that it will cause a fire are extremely low, i have never heard of such a case.

When a PSU blows there is always a chance it will take a component with it, most good ones tend not too, but it really depends what in the unit fails.
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July 23, 2010 2:49:47 AM

Hmm, thanx.
Congratulations. You just earned best answer!
By the way, everyone, thanks for the feed back: MousMonkey, Goofy, and hunter, thanks. :D 
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July 23, 2010 2:49:55 AM

Best answer selected by Yomammassson.
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