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SLI Mod / Hack Quad-Card Question

post #1 of 11
Thread Starter 
I know this tool was developed to allow SLI on non-SLI motherboards. Is anyone familiar with it to know if it can also allow a larger number of SLI cards on a motherboard that is SLI capable but has a maximum card limit?

I understand that nVidia only licenses quad-SLI to motherboard manufacturers that use 2x NF200 chips and force this in Bios code and a text string at driver level. I came upon this question as my Asus P8P67 WS Revolution motherboard can support quad-crossfire but only tri-SLI from Asus.

I figured if the board can support quad 8x lanes for quad-Crossfire with a single NF200, why wouldn't quad-SLI work? It appears to not be a hardware/physical limit, but a limit based on licensing/bios/driver.

I am just curious to know if the SLI Mod / Hack would allow the 4th card in SLI to operate.
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post #2 of 11
No, you can't do quad-sli without the NF200 chips.
Not even the hack can enable it.

Sli-Hack is software by "fixing" the drivers to ignore the bios check, while quad-sli with the NF200 chips is full hardware based. The cards won't allow to go to SLI without going through the NF200 chip which has its own code. You can't "trick" the drivers to by-pass it.

In non-sli boards and sli boards, there isn't any special hardware, just code in the bios which says whether the board support it or not.
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post #3 of 11
Thread Starter 
My board does have one NF200, just not two. That is interesting. The nVidia drivers actually look and make sure there are two NF200's? Is this just because of licensing? I don't see why quad-crossfire works fine but quad-SLI technically wouldn't work.

I thought the NF200 was just a transparent "dumb" PCI-E lane expander.
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post #4 of 11
NF200 has more uses than just add PCIE lanes.

And no, the drivers don't just check there are two NF200.
The cards themselves also work with the NF200 chips in order to recognize the last card as part of the SLI and enable it.

Crossfire is a totally different way.
This is also the reason why you can CFX different cards from the same family (like 6970 2GB and 6950 1GB together), but you can't SLI for example 460 with 768MB and 460 with 1GB no matter what hack you are going to try.
Edited by Defoler - 1/30/11 at 3:50am
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post #5 of 11
Thread Starter 
Do you know why one NF200 could not handle this requirement? I know of some of the features of the NF200 like broadcast, allowing the cards to communicate at higher PCI-E speeds. I just don't get what the NF200 is doing that it needs two of them for Quad SLI besides just a speed increase.

Regular X58/P67 doesn't need any NF200 for dual SLI. The MSI Big Bang Marshal motherboard will allow quad SLI with zero NF200 using a Hydra 200 chip. The Hydra 200 just acts as a PCI-E lane expander on that board so how will quad-SLI work?

And here is a board that has zero NF200 yet tri-SLI is working. See why I am confused? wink.gif

http://benchmarkextreme.com/Articles/Phenom%20II%20X6%201100T/P1.html
Edited by CallsignVega - 1/30/11 at 4:17am
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post #6 of 11
Quote:
Originally Posted by CallsignVega;12196065 
Do you know why one NF200 could not handle this requirement? I know of some of the features of the NF200 like broadcast, allowing the cards to communicate at higher PCI-E speeds. I just don't get what the NF200 is doing that it needs two of them for Quad SLI besides just a speed increase.

Regular X58/P67 doesn't need any NF200 for dual SLI. The MSI Big Bang Marshal motherboard will allow quad SLI with zero NF200 using a Hydra 200 chip. The Hydra 200 just acts as a PCI-E lane expander on that board so how will quad-SLI work?

And here is a board that has zero NF200 yet tri-SLI is working. See why I am confused? wink.gif

http://benchmarkextreme.com/Articles/Phenom%20II%20X6%201100T/P1.html

I think you have lots of miss-understandings.

Hydra doesn't allow quad-sli at all. Its a different technology, which mimics SLI/CFX by doing the load-balancing between the GPUs on the hydra drivers/hardware, instead of through the nvidia drivers or AMD drivers.
Its not quad-sli.
It may be quad-gpu, but not sli.

Tri-SLI doesn't require NF200 true.
The NF200 just gives extra lanes by "boosting" the limited 32 lanes when there is just one chip. Nothing more.

And still, 2xNF200 chips are required for quad-sli because whats how NVIDIA demands for the quad-sli to work.
Part marteking, extra costs.
It has other uses. But thats how they decided to implement it. Mostly in order to give the cards the bandwide it needs for the top-end cards.
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post #7 of 11
Thread Starter 
Naw, the whole mixed gpu nonsense about the Hydra 200 has been dropped for the MSI Big bang Marshal board. It's sole purpose in life is to give 4 PCI-E 16x lanes or 8 PCI-E 8x lanes for crossfire/SLI or whatever you want to do with them. The board is crossfire/SLI certified up to 4x cards with no NF200's at all.

If tri-SLI doesn't need an NF200, the only reason they put one on my motherboard that is 3-way SLI certified is just for the bandwidth? Then you add a 4th SLI card and you all of a sudden go from needing zero NF200 to needing two of them? I don't buy that.

Nvidia may demand 2x NF200 but I doubt it's hardware controlled. The reason I originally asked if SLI Hack software could enable it.
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post #8 of 11
lol... give it time.... and i reckon they will get 4 way SLI working with the hack lol
post #9 of 11
Thread Starter 
Quote:
Originally Posted by hodgoes2001;12196201 
lol... give it time.... and i reckon they will get 4 way SLI working with the hack lol

I noticed on the official SLI Mod page he says this:

Remember, this tool only allows driver to see chipset as X58, and inserts ASUS certification into windows registry. It don't allow to run SLI with different GPU's, don't allow to run NVIDIA GPU with ATI GPU together, don't do any magic, all just like running official "NVIDIA SLI-ready" system. It supports all SLI modes, present in current drivers, from 2-way SLI with two single-GPU videocards, to 3 and 4-GPU systems with three or four GPU's (Like two GTX295 in QuadSLI).

No mention of needing NF200's etc. I was just curious if someone had actual experience running the hack with quad SLI.
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post #10 of 11
Hello i recently saw this and was wondering how do you hack a motherboard to allow sli??
I have a asus m4a88td-evo usb3 motherboard and a amd phenom 970 along with a gtx 460

please help it would save me a good 140$ if i could figure how to sli on my board
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