Read it and weep. It has been verified (unofficial of course) Project xDevs: Контент / Публикации и Ñтатьи / Activating NVIDIA SLI on all motherboards, detailed HOW-TO
It seems Nvidia had been shining us all along with driver locks just to get us to by their overpriced SLI boards that aren't as stable or OC'able and the Intel counterparts. This seems to be old news but I figured I would share it with my fellow UD3P owners. This works on Intel and AMD Chipsets:
Give it a try, I will as soon as i get my hands on a 8800GTS 640.
It seems Nvidia had been shining us all along with driver locks just to get us to by their overpriced SLI boards that aren't as stable or OC'able and the Intel counterparts. This seems to be old news but I figured I would share it with my fellow UD3P owners. This works on Intel and AMD Chipsets:
User feedback, already tested systems with unofficial SLI working
Intel 5520 (Supermicro X8DAH+) + 2 x Quadro FX 4800 (GT200GL) on Windows 2008 R2 by derGhostrider
Intel 5520 (Supermicro X8DAi) + 2 x GeForce GTX 285 by coolmiester
Intel 5520 (Supermicro X8DAH+-F) + 2 x GeForce GTX 285 by coolmiester
Intel P55 (ASUS MAXIMUS III Formula) + 2 x GeForce 6600LE by xDevs.com
Intel P55 (ASUS MAXIMUS III Formula) + 3 x GeForce 8800Ultra by Xtremelabs.org
Intel X58 (ASUS P6T SE) + 2 x XFX GTX260 by reversedhex
Intel X58 (ASUS P6T) + 2 x GeForce 8800Ultra on Windows2008R2 by TiN
Intel X48 (Gigabyte X48-DS5) + 2 x GeForce 7900GS by Xtremelabs.org
Intel X48 (Gigabyte X48-DS5) + 2 x GeForce 8800Ultra by TiN
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 X48 (ASUS Rampage Extreme) + 2 x GeForce GTX 295 QuadSLI by Turrican
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce 6800Ultra by Turrican
Intel X48 (DFI LP LT X48) + 2 x GeForce 8500GT by AMD64
Intel X48 (DFI LP LT X48) + 2 x GeForce 7900GS by TiN
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce 9800GTX by Ghostleader
Intel X48 (ASUS Rampage Formula) + 2 x GeForce 9800GTX by Ghostleader
Intel X48 (ASUS P5E Deluxe) + 2 x GeForce 9600GT by benjounou
Intel X48 (Gigabyte X48-DQ6) + 2 x GeForce GTX 260 by TheWolf
Intel X48 (DFI LT X48) + 2 x GeForce 8800GT by nnygl
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce GTX 275 by boboe
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce GTX 280 by gradus
Intel X48 (Gigabyte GA-X48-DQ6) + 2 x GeForce 8800GT by Kopi
Intel X38 (ABIT IX38QuadGT) + 2 x GeForce GTX 260 by TheWolf
Intel X38 (Gigabyte GA-EX38-DS4) + 2 x GeForce 8800GT by hansiii
Intel P45 (ASRock P45X3 Deluxe) + 2 x GeForce 8800GTS by hdcore
Intel P45 (ASUS P5Q-Deluxe) + 2 x GeForce GTX 260 216sp by Goonit
Intel P45 (Asrock P45R2000-WiFi) + 2 x GeForce GTX 260 by Artyom
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 9800GTX+ by coop
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 9800GTX+ by deskilljoy
Intel P45 (ASUS P5Q-PRO) + 2 x GeForce GTX 275 by tpp
Intel P45 (ASUS P5Q Pro) + 2 x GeForce 9800GT by awdrifter
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 8800GT (Win7 32bit)
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 9800GTX+ by cjer
Intel P45 (Gigabyte EP45-DS4) + 2 x GeForce GTX 260 by cxghjcqr
Intel P45 (ASUS MAXIMUS II Formula) + 2 x GeForce 9800GTX + by sveetsnelda
Intel P45 (ASUS P5Q Deluxe) + 2 x GeForce GTX 285 by Death or Glory
Intel P45 (DFI LanParty DK P45 T2RS Plus) + 2 x GeForce 8800GTS by BakMZi
Intel P45 (ASUS Maximus II Formula) + 2 x GeForce GTX 285 by ovan_febriawan
Intel P45 (ASUS P5Q-E) + 2 x GeForce GTX 260 (65nm + 55nm) by manut2500
Intel P35 (Abit IP35ProXE) + 2 x GeForce GTX 260 (192sp + 216sp) by TheWolf
Intel P35 (DFI LT UT P35) + GeForce 8800GTX + GeForce 8800Ultra by TiN
Intel P35 (ASUS P5K Premium) + 2 x GeForce 8800GT by oiluj
Intel i975X (ASUS P5W DH DLX) + 2 x GeForce 7950GT by MikeTyson
Intel i975X (ASUS P5W DH) + 2 x GeForce 6600LE by TiN
Intel P965 (Gigabyte P965-DQ6) + 2 x GeForce 6600LE by TiN
Intel P965 (ASUS P5B Deluxe) + 2 x GeForce 6600LE by xDevs.com
Intel P965 (Gigabyte GA-P965-DQ6) + 2 x GeForce 8800GTS G80 by masoninc61
Intel P965 (ASUS P5B Deluxe) + 2 x GeForce 8800 Ultra by TiN on 195.62 WHQL w7-32 driver
Intel P965 (Gigabyte GA-965P-DS3P) + 2 x GeForce 9600GT by adidd
Intel 915P (ECS 915P-A2) + 2 x GeForce 8800GT by p_o_s_pc
AMD 790FX (ASUS Crosshair III Formula) + 2 x GeForce 280 GTX by dbphelps
AMD 790FX (DFI LP DK 790FXB-M2RS) + 2 x GeForce 9800GT by aGeoM
AMD 790FX (ASUS M479T Deluxe) + 2 x GeForce 6600GT by OgaiB
AMD 790FX (ASUS Crosshair III Formula) + 2 x GeForce 8800GT by eRazorzEDGE
AMD 790FX (ASUS Crosshair III Formula) + 2 x GeForce 9800GT by aGeoM
AMD 790FX (Gigabyte GA-MA790X-UD4P) by akula
AMD 780GX (Gigabyte GA-MA780G-UD3H) + 2 x GeForce 9800GT by Mosfet321
AMD 790GX (ECS A790GXM-A) + 2 x GeForce 9800GT
AMD 790GX (Foxconn A7DA-S) + 2 x GeForce 8800GT by Velvet Wafer
AMD 790GX (ECS A790GXM-AD3) + 2 x GeForce 9800GT/2 x GeForce 250GTS
AMD 790FX (ASUS M4A79 Deluxe) + 2 x GeForce 8500GT by Soundood
AMD 790FX (DFI UT 790FX-M2R) + 2 x GeForce 7600GS by AlexLion
AMD 770 (Abit AX78) + 2 x GeForce 8500GT by Soundood
Intel 5520 (Supermicro X8DAH+) + 2 x Quadro FX 4800 (GT200GL) on Windows 2008 R2 by derGhostrider
Intel 5520 (Supermicro X8DAi) + 2 x GeForce GTX 285 by coolmiester
Intel 5520 (Supermicro X8DAH+-F) + 2 x GeForce GTX 285 by coolmiester
Intel P55 (ASUS MAXIMUS III Formula) + 2 x GeForce 6600LE by xDevs.com
Intel P55 (ASUS MAXIMUS III Formula) + 3 x GeForce 8800Ultra by Xtremelabs.org
Intel X58 (ASUS P6T SE) + 2 x XFX GTX260 by reversedhex
Intel X58 (ASUS P6T) + 2 x GeForce 8800Ultra on Windows2008R2 by TiN
Intel X48 (Gigabyte X48-DS5) + 2 x GeForce 7900GS by Xtremelabs.org
Intel X48 (Gigabyte X48-DS5) + 2 x GeForce 8800Ultra by TiN
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 X48 (ASUS Rampage Extreme) + 2 x GeForce GTX 295 QuadSLI by Turrican
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce 6800Ultra by Turrican
Intel X48 (DFI LP LT X48) + 2 x GeForce 8500GT by AMD64
Intel X48 (DFI LP LT X48) + 2 x GeForce 7900GS by TiN
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce 9800GTX by Ghostleader
Intel X48 (ASUS Rampage Formula) + 2 x GeForce 9800GTX by Ghostleader
Intel X48 (ASUS P5E Deluxe) + 2 x GeForce 9600GT by benjounou
Intel X48 (Gigabyte X48-DQ6) + 2 x GeForce GTX 260 by TheWolf
Intel X48 (DFI LT X48) + 2 x GeForce 8800GT by nnygl
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce GTX 275 by boboe
Intel X48 (ASUS Rampage Extreme) + 2 x GeForce GTX 280 by gradus
Intel X48 (Gigabyte GA-X48-DQ6) + 2 x GeForce 8800GT by Kopi
Intel X38 (ABIT IX38QuadGT) + 2 x GeForce GTX 260 by TheWolf
Intel X38 (Gigabyte GA-EX38-DS4) + 2 x GeForce 8800GT by hansiii
Intel P45 (ASRock P45X3 Deluxe) + 2 x GeForce 8800GTS by hdcore
Intel P45 (ASUS P5Q-Deluxe) + 2 x GeForce GTX 260 216sp by Goonit
Intel P45 (Asrock P45R2000-WiFi) + 2 x GeForce GTX 260 by Artyom
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 9800GTX+ by coop
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 9800GTX+ by deskilljoy
Intel P45 (ASUS P5Q-PRO) + 2 x GeForce GTX 275 by tpp
Intel P45 (ASUS P5Q Pro) + 2 x GeForce 9800GT by awdrifter
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 8800GT (Win7 32bit)
Intel P45 (Gigabyte EP45-UD3P) + 2 x GeForce 9800GTX+ by cjer
Intel P45 (Gigabyte EP45-DS4) + 2 x GeForce GTX 260 by cxghjcqr
Intel P45 (ASUS MAXIMUS II Formula) + 2 x GeForce 9800GTX + by sveetsnelda
Intel P45 (ASUS P5Q Deluxe) + 2 x GeForce GTX 285 by Death or Glory
Intel P45 (DFI LanParty DK P45 T2RS Plus) + 2 x GeForce 8800GTS by BakMZi
Intel P45 (ASUS Maximus II Formula) + 2 x GeForce GTX 285 by ovan_febriawan
Intel P45 (ASUS P5Q-E) + 2 x GeForce GTX 260 (65nm + 55nm) by manut2500
Intel P35 (Abit IP35ProXE) + 2 x GeForce GTX 260 (192sp + 216sp) by TheWolf
Intel P35 (DFI LT UT P35) + GeForce 8800GTX + GeForce 8800Ultra by TiN
Intel P35 (ASUS P5K Premium) + 2 x GeForce 8800GT by oiluj
Intel i975X (ASUS P5W DH DLX) + 2 x GeForce 7950GT by MikeTyson
Intel i975X (ASUS P5W DH) + 2 x GeForce 6600LE by TiN
Intel P965 (Gigabyte P965-DQ6) + 2 x GeForce 6600LE by TiN
Intel P965 (ASUS P5B Deluxe) + 2 x GeForce 6600LE by xDevs.com
Intel P965 (Gigabyte GA-P965-DQ6) + 2 x GeForce 8800GTS G80 by masoninc61
Intel P965 (ASUS P5B Deluxe) + 2 x GeForce 8800 Ultra by TiN on 195.62 WHQL w7-32 driver
Intel P965 (Gigabyte GA-965P-DS3P) + 2 x GeForce 9600GT by adidd
Intel 915P (ECS 915P-A2) + 2 x GeForce 8800GT by p_o_s_pc
AMD 790FX (ASUS Crosshair III Formula) + 2 x GeForce 280 GTX by dbphelps
AMD 790FX (DFI LP DK 790FXB-M2RS) + 2 x GeForce 9800GT by aGeoM
AMD 790FX (ASUS M479T Deluxe) + 2 x GeForce 6600GT by OgaiB
AMD 790FX (ASUS Crosshair III Formula) + 2 x GeForce 8800GT by eRazorzEDGE
AMD 790FX (ASUS Crosshair III Formula) + 2 x GeForce 9800GT by aGeoM
AMD 790FX (Gigabyte GA-MA790X-UD4P) by akula
AMD 780GX (Gigabyte GA-MA780G-UD3H) + 2 x GeForce 9800GT by Mosfet321
AMD 790GX (ECS A790GXM-A) + 2 x GeForce 9800GT
AMD 790GX (Foxconn A7DA-S) + 2 x GeForce 8800GT by Velvet Wafer
AMD 790GX (ECS A790GXM-AD3) + 2 x GeForce 9800GT/2 x GeForce 250GTS
AMD 790FX (ASUS M4A79 Deluxe) + 2 x GeForce 8500GT by Soundood
AMD 790FX (DFI UT 790FX-M2R) + 2 x GeForce 7600GS by AlexLion
AMD 770 (Abit AX78) + 2 x GeForce 8500GT by Soundood
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