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What do I need to run 2 9800 GTXs in SLI?

kissenger

kissenger

kissenger

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10 Apr 2008
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Can anyone tell me the answer?

I'm building a PC and I plan on running one Gx2 for now, but it would be nice to have the option to SLI at some point down the road.

I figured I'd need a decent power supply at 750W or higher, but I guess I'll also need a pretty slick mobo. Will this one do the trick:

http://www.overclockers.co.uk/showproduct.php?prodid=MB-235-AS

On top of that I suppose I'd also need some extra cooling. It all sounds very expensive.

Maybe I'll be better off not bothering to make my machine SLI-able and saving some money by getting a slightly cheaper PSU, mobo, cooling system, etc?
 
Upgrading my mobo so that I can run 2 9800GX2s would add about £100 to my budget. It doesn't seem worth it. I guess I'll just stick with the P35.
 
I just checked wikipedia on the 750i. This is what it states:

nForce 750i

* Codenamed C72P
* Addition of the nForce 200 PCI-E bridge (previously codenamed BR-04)
o Connected to the northbridge via a 4.5 Gbit/s proprietary bus
o Support for PCI-E 2.0 [1]
* SLI
o Slot 1: full speed PCI Express 2.0 x16 slot from nForce 200
o Slot 2: full speed PCI Express 2.0 x8 slot from nForce 200
* Supports a maximum of DDR2-800 dual-channel memory
* Support 1333 MHz FSB

I guess that means it won't SLI properly..
 
I only plan on buying one, but I just want the option to upgrade down the line. Also, if PCI-E 2.0 has any benefits, I want to make the most of that aswell (I figure there's no point getting a GX2 if you are limited by having PCI-E 1.1 bandwith).
 
Yeah, but when the G200s come out they will cost an arm and a leg too...

I think this is the decision I have to make:

get a GTS with a P5N-E mobo and uprade GPU and mobo later on

OR,

get a GX2 with a P5N-T mobo, pay more now, but avoid having to upgrade in the next 3 years or so.

Edit: the current price diff is about £300 btw - I can't decide whether it's worth it (afterall, if I was to SLI 2 GTSs that difference would only be about £150, and I would have to make do with a relatively inferior mobo)
 
Last edited:
Fire Wizard said:
I didn't notice that kissenger was talking about the Nvidia 9800 GX2 in his very first post. I swear it said the Nvidia 9800 GTX when I first looked at the original post. :p

Would you care to clarify for us kissenger please? :)
Click to expand...

Oops, sorry. I meant GX2, not GTX. I posted that really late at night.:rolleyes:
 
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