would like to run SLI just for fun and frustration

NO FUN ALLOWED.

Haha! The last time I ran something with the name 'SLI' it involved 2 x 12 MB Voodoo 2 cards. That was mostly fun, so I'm curious to experience the Nvidia version in games up to DX9.

Try GeForce GTX 480 SLI. So much fun... Hell localised entirely within your kitchenPC (and nearby premises)!

Looks like it is possible.
See here:
http://www.ps3grid.net/PS3GRID/forum_thread.php?id=3341
https://forums.evga.com/I-need-help-cannot-ac … s-m1934063.aspx

And some other stuff that may not be relevant since I am not sure if any of these support XP at all:
https://www.techpowerup.com/forums/thre ... t-2414995
https://www.philscomputerlab.com/sli-on-chine … therboards.html

cyclone3d wrote on 2022-06-07, 04:09:

Looks like it is possible. See here: http://www.ps3grid.net/PS3GRID/forum_thread.php?id=3341 https://forums.evga.com/I-need-help […]
Show full quote

Looks like it is possible.
See here:
http://www.ps3grid.net/PS3GRID/forum_thread.php?id=3341
https://forums.evga.com/I-need-help-cannot-ac … s-m1934063.aspx

Thank you for these links. Looks like they are for getting the GTX 690 recognised by the drivers via .inf mods, but it will only work with one of the card's GPUs and not both in SLI. The GTX 690 had 2x GK104 chips so this is not looking good for SLI with the GTX 660 Ti.

porschemad911 wrote on 2022-06-07, 04:24:

cyclone3d wrote on 2022-06-07, 04:09:

Looks like it is possible. See here: http://www.ps3grid.net/PS3GRID/forum_thread.php?id=3341 https://forums.evga.com/I-need-help […]
Show full quote

Looks like it is possible.
See here:
http://www.ps3grid.net/PS3GRID/forum_thread.php?id=3341
https://forums.evga.com/I-need-help-cannot-ac … s-m1934063.aspx

Thank you for these links. Looks like they are for getting the GTX 690 recognised by the drivers via .inf mods, but it will only work with one of the card's GPUs and not both in SLI.

Right, but the newest official SLI support for XP looks to be the 670.

If I had a couple 680's I could test modifying the .inf file.... see if I could trick XP into having SLI for the 680 cards IF XP were tricked into thinking the cards were 670 cards. I don't see why SLI on 680s shouldn't work other than Nvidia blocking it just because.

The XP limitation looks to be just with AFR(alternate frame rendering) and AA when in SLI.
SFR (split frame rendering) should still work as it is not mentioned.

cyclone3d wrote on 2022-06-07, 04:42:

Right, but the newest official SLI support for XP looks to be the 670. […]
Show full quote

Right, but the newest official SLI support for XP looks to be the 670.

If I had a couple 680's I could test modifying the .inf file.... see if I could trick XP into having SLI for the 680 cards IF XP were tricked into thinking the cards were 670 cards. I don't see why SLI on 680s shouldn't work other than Nvidia blocking it just because.

The XP limitation looks to be just with AFR(alternate frame rendering) and AA when in SLI.
SFR (split frame rendering) should still work as it is not mentioned.

Hmmm ... I think this knowledge base article on SLI support in Windows XP rules out the 670:

Nvidia wrote:

The following SLI features are not supported on Windows XP: […]
Show full quote

The following SLI features are not supported on Windows XP:

• Geforce GTX 680, 670 SLI
• Quad SLI technology using GeForce GTX 590, GeForce 9800 GX2 or GeForce GTX 295
• 3-way SLI technology
• Hybrid SLI
• SLI multi-monitor support

And I think this might rule out SFR (from Kepler-era driver release notes):

Nvidia wrote:

Kepler GPU Limitations SLI Support […]
Show full quote

Kepler GPU Limitations
SLI Support

• There is no support for SLI frame rendering (AFR/SFR) or SLI FSAA.

I'm just hoping that some form of real SLI might actually be supported on the GTX 660 Ti.

SFR is a legacy rendering method back from GeForce 6800 days and is not used.

Well, I found a couple GTX 670 4GB cards for cheap-ish so I bought them.

Still want to get a couple 680s and a couple 690s and the prices on those are coming down to where I could justify buying them.

Have been wanting to do some testing in XP with SLI.

It looks like SFR should be able to be forced with Nvidia inspector if SFR is not there in XP in the first place.
https://www.nvidia.com/en-us/geforce/forums/g … g-compatabilty/

Hmmm, if I go back to earlier drivers supporting Kepler (eg 306.81) and check the release notes, they don't mention the same restrictions about SLI not being supported for the GTX 670 (only for the GTX 680) and the Kepler GPU not supporting AFR limitations. I wonder if they were unintentionally omitted from the driver release notes, or intentionally disabled in later driver releases.

cyclone3d wrote on 2022-06-07, 05:11:

Well, I found a couple GTX 670 4GB cards for cheap-ish so I bought them.

Nice! Very interested to hear the results of your testing!

Doesn't look too promising ... from a comment about the 302.59 beta drivers:

These appear to be the only Windows XP drivers with working SLi on Kepler (GTX 600) cards, albeit only working in Window mode (fullscreen = red screen of death). Vsync doesn't appear to be working in windowed mode though. This is also the last driver version to officially support the GTX 690 on Windows XP, presumably because they gave up on getting SLi working.

And from the 306.81 driver 'Additional details'

*Note: The following SLI features are only supported on Windows Vista, Windows 7, and Windows 8: GeForce GTX 600 series SLI, Quad SLI technology, 3-way SLI technology, Hybrid SLI, and SLI multi-monitor support.

cyclone3d wrote on 2022-06-07, 05:11:

Well, I found a couple GTX 670 4GB cards for cheap-ish so I bought them. […]
Show full quote

Well, I found a couple GTX 670 4GB cards for cheap-ish so I bought them.

Still want to get a couple 680s and a couple 690s and the prices on those are coming down to where I could justify buying them.

Have been wanting to do some testing in XP with SLI.

It looks like SFR should be able to be forced with Nvidia inspector if SFR is not there in XP in the first place.
https://www.nvidia.com/en-us/geforce/forums/g … g-compatabilty/

Out of curiosity, did you manage to give this a go?

Most likely not, because SLI support is not implemented for specific cards, but for chips.