The table below shows the specifications of the Intel Duo Core processors
| E8500 | E6850 |
| # of Cores 2 # of Threads 2 Processor Base Frequency 3.16 GHz Cache 6 MB L2 Cache Bus Speed 1333 MHz FSB Parity No TDP 65 W VID Voltage Range 0.8500V-1.3625V |
# of Cores 2 # of Threads 2 Processor Base Frequency 3.00 GHz Cache 4 MB L2 Cache Bus Speed 1333 MHz FSB Parity No TDP 65 W VID Voltage Range 0.8500V-1.5V |
This link discusses the use of the 2nd PCIE_16 slot for a PCIE_1 card such as the Creative Sound Blaster Fx Audigy.
https://forums.techguy.org/threads/solved-pcie-slot-not-working-on-asus-p5n-e-sli.1114972/