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Questions about 9800gx2

post #1 of 10
Thread Starter 
will this dual gpu card plug into a 1 pcie slot system? also can I power this card with a seperate power supply? thanks
post #2 of 10
Yes to both questions
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post #3 of 10
it'll use 1 PCI-E slot but may take up nearly 2 due to it's cooler getting in the way as for the seperate power supply it's usualy best to use the PSU that's powering the rest so you don't have issues later.
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post #4 of 10
Thread Starter 
to power this gpu with another psu would I have to do anything to the psus first. Thank you guys so much for your help. I think I'm going to purcase one of these. ( found a new one really cheap)
post #5 of 10
You will need to set up a dummy circuit to start the second PSU, preferably with a switch to make i easier to start at the same time as the main PSU. If you're good at electrical engineering (or know someone who is) you could even rig them to start and stop together.

At the end of the day though, you're probably better off using a single powerful PSU. Remember to be careful, power supplies can hold a large residual charge even when unplugged - powerful enough to seriously injure (or kill if you have a weak heart).
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post #6 of 10
Thread Starter 
used the paperclip trick and plugged it in the wall and the psu starts up fine! do you think I could use this psu for my gpu (9800gx2) and my main psu for the rest of the system? thanks.
post #7 of 10
i don't see why you wanna do that personally, ethier you got to low wattage psu on the system or no connectors for it... just so you know it will be using the PSU you got in your system like 75watts which comes from the PCI-E slot alone, figure i'd throw that out there redface.gif


dunno how well the 9800GX2 will coop with that...
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post #8 of 10
You need a chipset that supports SLI or it will only use one GPU, AFAIK.
post #9 of 10
I have found some motherboards (mainly the Intel DG31PR) where the 9800GX2 simply does not work(low end single PCI-e board).The danger warning with power supplies comes with power supplies that are part of a system that develops high voltage for old style TV's or CRT's,not used in a computer power supply.In a computer power supply we rectify 115-120DC to various 12-5 VDC values,very safe.We do have capacitors but they are used for coupling and filtering,not developing high voltage.You can still get a slight sting off a low voltage cap,just like you can off an ignition points condensor (used in older cars).

EDIT: methods for one power supply turning the other on are not complex and easily found.You also want to make sure the power supplies DC output side share a common ground point.
Edited by PCCstudent - 9/9/12 at 11:35am
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post #10 of 10
Either buy a bigger power supply. Or buy a 5½ bay mount power supply if you would like to go that route. Thanks
http://www.newegg.com/Product/Product.aspx?Item=N82E16817153069
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2700091&SRCCODE=WEBINKPLP&CMP=OTC-INKTOMI
http://www.newegg.com/Product/Product.aspx?Item=N82E16817104019&nm_mc=OTC-Froogle&cm_mmc=OTC-Froogle-_-Power+Supplies-_-FSP+Group+%28Fortron+Source%29-_-17104019
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