I just recently bought a second 8800 gt from evga same type as the one i previously had and ran it in sli. When I loaded any game while using SLI my FPS dropped by about 20-30 and I cant figure out why. Im using a 780i evga motherboard which is the same brand as the video cards.
Newegg.com - EVGA 512-P3-N802-AR GeForce 8800GT Superclocked 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Desktop Graphics / Video Cards
Newegg.com - EVGA 132-CK-NF78-A1 LGA 775 NVIDIA nForce 780i SLI ATX Intel Motherboard - Intel Motherboards
Newegg.com - EVGA 512-P3-N802-AR GeForce 8800GT Superclocked 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Desktop Graphics / Video Cards
Newegg.com - EVGA 132-CK-NF78-A1 LGA 775 NVIDIA nForce 780i SLI ATX Intel Motherboard - Intel Motherboards