BOTH THE SLOTS ARE TRUE PCIe x16 SLOTS.
- Most reviews websites are clueless. :P
- What part of nForce 2200 + 2050 do they not understand ?, oh they lack chipset knowledge in any way, shape or form.
Yes, you'll need 2 CPUs to get the most from the board.
Yes, you need to enable BIOS options to get the maximum out of SLI for said chipset. (nForce 2200 + 2050 was the 1st true dual PCIe x16 chipset, well before the consumer nForce 4 Ultra / 32, etc)
The PCI-X (NEVER TO BE CONFUSED WITH PCI Express) slots will not all be active with only one processor, however the SLI should still work with just one CPU.
Sometimes I wonder if sites do paper reviews, based on what they (clearly don't) know about hardware.