Before we start, please note that this method already has been checked and proved working on the following systems:
Intel P965 (ASUS P5B Deluxe) + 2 x GeForce 6600LE by xDevs.com
Intel P45 (ASUS MAXIMUS II Formula) + 2 x GeForce 9800GTX + by sveetsnelda
Intel X48 (Gigabyte X48T-DQ6) + 2 x GeForce GTX 260 216sp by DeDaL
Intel X48 (ASUS P5E64WS Evolution) + 2 x GeForce 7900GS by Xtremelabs.org
Intel X38 (ABIT IX38QuadGT) + 2 x GeForce GTX 260 by TheWolf
Intel P55 (ASUS MAXIMUS III Formula) + 2 x GeForce 6600LE by xDevs.com
Intel P45 (ASUS P5Q Deluxe) + 2 x GeForce GTX 285 by Death or Glory
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce 6800Ultra by Turrican
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 8800GT (Win7 32bit)
Intel P45 (Gigabyte EP45-DS4) + 2 x GeForce GTX 260 by cxghjcqr
Intel P965 (Gigabyte P965-DQ6) + 2 x GeForce 6600LE by TiN
Intel X48 (DFI LP LT X48) + 2 x GeForce 7900GS by TiN
Intel X48 (ASUS Rampage Formula) + 2 x GeForce 9800GTX by Ghostleader
AMD 790X (Gigabyte GA-MA790X-UD4P) by akula
AMD 790X (DFI LP DK 790FXB-M2RS) + 2 x GeForce 9800GT by aGeoM
Intel P35 (Abit IP35ProXE) + 2 x GeForce GTX 260 (192sp + 216sp) by TheWolf
Intel 5520 (Supermicro X8DAH+) + 2 x Quadro FX 4800 (GT200GL) on Windows 2008 R2 by derGhostrider
Despite the small current list, this modification allow to run SLI on ANY chipset, and not just Intel or NVIDIA. Technically SLI can be enabled even on a Motherboard with an AMD Chipset. Of course, board must have two or more PCI-Express slots for graphic cards.
This method has been successfully tested and implemented on the following operating systems:
Microsoft Windows XP 32-bit
Microsoft Windows Vista 32-bit
Microsoft Windows Vista 64-bit
Microsoft Windows 7 32-bit
Microsoft Windows 7 64-bit
So making multiple NVIDIA cards working together in SLI mode can be done on all motherboards now. This became true due simplified verification procedure, which is implemented for Intel X58 platform.
*www.xdevs.com/sli/slin.jpg
