SLI 8800gt power supply question

jfenwick · 05-02-2008, 12:54 PM

So looking to set up 8800gt SLI for my system but I have a power issue, there are 8 molex power connectors from the PSU and the galaxy 8800gt requires 4 each. If you're doing the math, so far no problem, but in the antec there are tons of fans, I've swaped them all out to 3pin supply but the top fan requires the molex. Now I have a number of single-->double molex splitters, if I use those for the card does that comprimise supply? Essentially I want to know if using the splitter on a single molex to the card will affect the juice its getting.

Ste · 05-02-2008, 01:12 PM

hrmm its odd that the card uses 4 molex connectors and not two PCIE 6 Pins.

anyways, use the molex splitters on fans and other devices and use the molex connectors comming directly from the PSU to the card.

surgeVel · 05-02-2008, 01:28 PM

According to the Galaxy website:

Quote:

NVIDIA GeForce 8800 GT requires:
PCI Express®-compliant motherboard with one x16 graphics slot
6-pin supplementary power connectors
Minimum 400W or greater system power supply (with 12V current rating of 26A)*

So I'm not sure why his requires 4pin molex.

Ste · 05-02-2008, 01:30 PM

yea I don't know either......

Puddle Jumper · 05-02-2008, 01:31 PM

He might be using a molex to pcie adapter because his psu does not have a pcie connector.

Ste · 05-02-2008, 01:34 PM

Oh man, I can only imagine the added resistance..

I would just reccomend buying a power supply with the correct amount of connectors..

surgeVel · 05-02-2008, 01:39 PM

Oh wow, yes, to go through all the trouble with all those adapters and everything. I'd just buy myself a new psu.

veedubfreak · 05-02-2008, 02:04 PM

Just go buy a corsair hx520. You wont be disappointed.

jfenwick · 05-02-2008, 02:46 PM

Ok, i'm a newb :P

lol, switched from the ocz to the corsair and for some sorry sleep deprived reason I thought these pcie's were 4 pin. Ok, so have one card running on the two 6pin suppliers and the other is on adapters as the psu only has 2, 6 pin suppliers, and each card requires 2, freakn power hungry buggers these 8800gt's.

Now my next problem is getting it to work, I see both cards detected in device manager but i don't think they are enabled as my 3Dmark06 score just decreased.

I tried going into nvidia control panel like all the help threads say but my control panel doesn't have the "Set SLI Configuration" option under 3D settings that seems to be the way to enable it. Any ideas or am i just being dumb again?

[edit]options i see:

"adjust image settings with preview" and "monitor temperature levels" if i switch to advanced mode i also get "manage 3d settings", "change overclocking configuration" and "monitor temperature levels" [/edit]

RicoDirenzo · 05-02-2008, 02:53 PM

Quote:

Originally Posted by jfenwick

Ok, i'm a newb :P

lol, switched from the ocz to the corsair and for some sorry sleep deprived reason I thought these pcie's were 4 pin. Ok, so have one card running on the two 6pin suppliers and the other is on adapters as the psu only has 2, 6 pin suppliers, and each card requires 2, freakn power hungry buggers these 8800gt's.

Now my next problem is getting it to work, I see both cards detected in device manager but i don't think they are enabled as my 3Dmark06 score just decreased.

I tried going into nvidia control panel like all the help threads say but my control panel doesn't have the "Set SLI Configuration" option under 3D settings that seems to be the way to enable it. Any ideas or am i just being dumb again?

[edit]options i see:

"adjust image settings with preview" and "monitor temperature levels" if i switch to advanced mode i also get "manage 3d settings", "change overclocking configuration" and "monitor temperature levels" [/edit]

My EVGA 8800 gt's only require one 6 pin PCIe adapter each. I find it hard to believe yours requires 2 x 6 pins each. I'm thinking your confused.

05-02-2008, 12:54 PM	#1 (permalink)
jfenwick Ultra Techie Join Date: Jun 2007 Location: Toronto Posts: 778	SLI 8800gt power supply question So looking to set up 8800gt SLI for my system but I have a power issue, there are 8 molex power connectors from the PSU and the galaxy 8800gt requires 4 each. If you're doing the math, so far no problem, but in the antec there are tons of fans, I've swaped them all out to 3pin supply but the top fan requires the molex. Now I have a number of single-->double molex splitters, if I use those for the card does that comprimise supply? Essentially I want to know if using the splitter on a single molex to the card will affect the juice its getting. __________________

05-02-2008, 01:12 PM	#2 (permalink)
Ste lvl Infinite Psychopath Join Date: Aug 2005 Location: Mount Prospect, IL Posts: 8,567	Re: SLI 8800gt power supply question hrmm its odd that the card uses 4 molex connectors and not two PCIE 6 Pins. anyways, use the molex splitters on fans and other devices and use the molex connectors comming directly from the PSU to the card. __________________ Read The Rules!! Power Supply Guide Intel Overclocking Thread AMD Overclocking Thread Other Important Threads I'm sorry but I do not accept support requests via IM, email, or personal messages There will come a day, such a day when all will be told more than they wish to know, what one hears may explain the past, it may explain the future, but it has never made a difference either way and it will change nothing. Some day.... But that is not this day, and I don't know when, I just don't know.

05-02-2008, 01:30 PM	#4 (permalink)
Ste lvl Infinite Psychopath Join Date: Aug 2005 Location: Mount Prospect, IL Posts: 8,567	Re: SLI 8800gt power supply question yea I don't know either...... __________________ Read The Rules!! Power Supply Guide Intel Overclocking Thread AMD Overclocking Thread Other Important Threads I'm sorry but I do not accept support requests via IM, email, or personal messages There will come a day, such a day when all will be told more than they wish to know, what one hears may explain the past, it may explain the future, but it has never made a difference either way and it will change nothing. Some day.... But that is not this day, and I don't know when, I just don't know.

05-02-2008, 01:31 PM	#5 (permalink)
Puddle Jumper No place like 127.0.0.1 Join Date: Oct 2007 Posts: 1,555	Re: SLI 8800gt power supply question He might be using a molex to pcie adapter because his psu does not have a pcie connector. __________________ Save Stargate Atlantis. Click here to sign the petition

05-02-2008, 01:34 PM	#6 (permalink)
Ste lvl Infinite Psychopath Join Date: Aug 2005 Location: Mount Prospect, IL Posts: 8,567	Re: SLI 8800gt power supply question Oh man, I can only imagine the added resistance.. I would just reccomend buying a power supply with the correct amount of connectors.. __________________ Read The Rules!! Power Supply Guide Intel Overclocking Thread AMD Overclocking Thread Other Important Threads I'm sorry but I do not accept support requests via IM, email, or personal messages There will come a day, such a day when all will be told more than they wish to know, what one hears may explain the past, it may explain the future, but it has never made a difference either way and it will change nothing. Some day.... But that is not this day, and I don't know when, I just don't know.

05-02-2008, 01:39 PM	#7 (permalink)
surgeVel New Netflix Subscriber! Join Date: Feb 2008 Location: Fort Wayne, IN Posts: 1,165	Re: SLI 8800gt power supply question Oh wow, yes, to go through all the trouble with all those adapters and everything. I'd just buy myself a new psu. __________________ -surgeVel Surge Velocity - Custom Built Computers For Speed and Power that is Light on Your Wallet! If you'd rather not risk building yourself, we won't charge an arm and a leg to do it for you! www.SurgeVelocity.com-Updated! \| NZXT Cases at lowest prices! \| Inferno Deals: The NewEgg Alternative!

05-02-2008, 02:04 PM	#8 (permalink)
veedubfreak Official DFI Bricker Join Date: Jul 2007 Posts: 6,094	Re: SLI 8800gt power supply question Just go buy a corsair hx520. You wont be disappointed. __________________ EVGA 750i FTW Q6600@3.6gz 1.4v (1.2VID) EVGA GTX260 SLI 2x2gb OCZ Reaper DDR2-800 @4-4-4-12 Corsair 750TX MountainMods Ufo Horizontal 2x Swiftech 320 2x Swiftech 655 2x MM 3bay res 2x XSPC FC Blocks Swiftech GTZ Have you heard? http://www.tech-forums.net/pc/f6/hav...-heard-187280/

05-02-2008, 02:46 PM	#9 (permalink)
jfenwick Ultra Techie Join Date: Jun 2007 Location: Toronto Posts: 778	Re: SLI 8800gt power supply question Ok, i'm a newb :P lol, switched from the ocz to the corsair and for some sorry sleep deprived reason I thought these pcie's were 4 pin. Ok, so have one card running on the two 6pin suppliers and the other is on adapters as the psu only has 2, 6 pin suppliers, and each card requires 2, freakn power hungry buggers these 8800gt's. Now my next problem is getting it to work, I see both cards detected in device manager but i don't think they are enabled as my 3Dmark06 score just decreased. I tried going into nvidia control panel like all the help threads say but my control panel doesn't have the "Set SLI Configuration" option under 3D settings that seems to be the way to enable it. Any ideas or am i just being dumb again? [edit]options i see: "adjust image settings with preview" and "monitor temperature levels" if i switch to advanced mode i also get "manage 3d settings", "change overclocking configuration" and "monitor temperature levels" [/edit] __________________ Last edited by jfenwick; 05-02-2008 at 02:50 PM.

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