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2x6800GS SLI

post #1 of 9
Thread Starter 
Newegg has a refurbished eVGA 6800GS for about $90. I'm thinking of modding my board to SLI; as SLI helps alot with high amounts of FSAA.

Nvidia recommends 420 Watts for SLI; but DFI boards are known to drain more power.

Questions?

1. Do you think my PSU could handle two 6800GS's (non-overclocked, with as stock CPU?)

2. How much of a difference does the SLI bridge make? Where can I buy one?

3. Where can I find out how to mod my motherboard to the SLI DR? And does it have a high success rate?

Thanks, and rep+ for anyone who contributes.
    
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post #2 of 9
Quote:
Originally Posted by Fatal05 View Post
Newegg has a refurbished eVGA 6800GS for about $90. I'm thinking of modding my board to SLI; as SLI helps alot with high amounts of FSAA.

Nvidia recommends 420 Watts for SLI; but DFI boards are known to drain more power.

Questions?

1. Do you think my PSU could handle two 6800GS's (non-overclocked, with as stock CPU?)

2. How much of a difference does the SLI bridge make?

3. Where can I find out how to mod my motherboard to the SLI DR? And does it have a high success rate?

Thanks, and rep+ for anyone who contributes.
1. Your PSU should be able to handle it. Might struggle, but it should do.

2. SLI with the 6800GS's I believe will give a decent increase in power. I don't know if I could justify doing that over buying a completely new GPU though.

3. There are several guides on DFI-street.com that show how to do this. Basically you take off that chipset fan, remove some epoxy, and making some connections with a circuit writer/pencil. I believe sideburns did this mod, so you can ask him about it too.
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post #3 of 9
1. Yes, I think your PSU could handle the load, FSP are great PSUs.
2.
Without SLI Bridge
With SLI Bridge
Results are both from my rig, with identical clocks on everything. Only difference is a lack of SLI bridge. So yes, it does make a difference. As to where can you buy one, ebay is going to be your best bet, you could also try posting a wanted add here on OCN.
3. DFIStreet is a great place for finding information on how to mod the board to SLI, and yes, if done correctly it is almost 100% idiot proof, it is a simple pen mod.
post #4 of 9
Thread Starter 
Thanks for the input , I think ill take the plunge.

EDIT: Does it have to be a hardware mod? Is there a software mod I can do instead?
    
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post #5 of 9
Its a hard mod, there are no soft mods you can do to enable SLI on that board.
post #6 of 9
Personally i would get a new PSU.

From DFI street
Quote:
DFI REQUIRES native 24-pin ATX molex & 480W for all the DFI N4 mobos.
Also 2x18amps isnt exactly brilliant especially for a DFI and SLI.

Quote:
"A" List for Non-SLI / Non-Expert PSU's: These are KNOWN to work well with DFI N4 mobos using mid-range to low-end SLI/Crossfire:

Antec NeoPower NeoHE 550 ATX12V 550W Power Supply
(personally tested thoroughly by Happy_Games and it is an excellent psu. Not recommended for highest-end SLI/Crossfire (X1900 / 7900))

HIPER HPU-4K580-MS ATX12V 580W Power Supply
(personally tested by Happy_Games. No 8-pin EPS connector so not recommended for any board with the 8-pin EPS connect. Works most excellent in any other system. Not recommended for high-end Crossfire/SLI but will handle any overclocked system with any single high-end video card, or any mid-range to low-end SLI *7600, 6600, X1600 Xfire, etc*)
Notice they are all above 500w and are pretty good psu's...

Also just read through all the threads on DFI street. Lots are to do with PSU related issues. Dont chance get a new one.

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post #7 of 9
I would say yes get a new PSU however at a Push it should be able to hold stable. Heres the Hardware mod for your motherboard : http://www.dfi-street.com/forum/showthread.php?t=10736
post #8 of 9
your power supply will work as i have two 6800 gs and they dont pull as near wattage as a 7000+ series card as i do have mine in sli and i have a lower class card because i only play doom3 nothing else makes me want to play ill never upgrade unless the cards diebut you should have no problems seems to me all your other items are not to bad on power and be good to go
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post #9 of 9
Get better PSU, then overclock the crap out of the cards. They overclock amazingly.
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