Realtek NICs don't like either other
Ok, small windows 7 network issue.
3 computers involved
First computer (A) has dual realtek NICs on x58 board
Second computer (B) has PCI-E Intel NIC, and disabled realtek NIC onboard
Third computer (C) has realtek NIC on ATI 780G board
all nics are gigabit plugged into to the same gigabit switch
from A to B full speed
from B to A full speed
from B to C full speed
from C to B full speed
from C to A about 100-800kbps
from A to C about 100-800kbps
both C and A computers have realtek nics.
Windows 8 the next big failure, right after Windows ME