keybaud said:
Found a response to my own question:
http://www.hothardware.com/viewarticle.aspx?articleid=925&cid=3
The core differences are these. The nForce 650i SLI, which is what we'll be looking here today, only supports 8 x 8 SLI, rather than the full 16 x 16 SLI on the nForce 680i. and cannot support a third PCI Express graphics slot due to its fewer PCI Express lanes. Beyond these four features, the 650i and the 680i are virtually identical. Therefore, if you're like many users and don't need SLI x16 support, don't need multiple NIC's and can do overclocking the manual way, well, the nForce 650i is a much better value."
S
Not so sure about that...
"Asus P5N32-E SLI Plus Features
Support for all Intel LGA775 processors, including Pentium 4, Pentium D, Pentium Extreme Edition, Core 2 Duo, Core 2 Quad and Core 2 Extreme;
Northbridge: NVIDIA nForce 650i SLI (C55-SLIX8N-A2);
Southbridge: NVIDIA MCP55P (NF590-SLI-N-A2);
Support for up to 8GB of DDR2-533, DDR2-667 or DDR2-800MHz memory, with additional support for NVIDIA SLI-Ready Memory up to 1200MHz;
Two PCI-Express x16 slots for SLI (blue, running at x16) and one PCI-Express x16 slot (white, running at x8), one PCI-Express x1 slot and two PCI slots;
Asus SupremeFX Audio Card with 7.1 channel support via ADI1988B HD Audio codec, complete with jack sensing, multi-streaming, jack-retasking and noise filter, along with co-axial and optical S/PDIF out ports;
Dual Gigabit Ethernet PHY via a pair of PCI-Express based Marvell 88E1116-NNC1 network controllers;"
From
http://www.bit-tech.net/hardware/2007/02/06/asus_p5n32e_sli_plus/1.html