4(x - 8)
It is the sign of multiplication in an expression.
20-50 usd
No
1x128 2x64 4x32 8x16
About $30
Send it back.
See link below-
5-100 usd
ATX is the form factor.
MB is ATX form factor.
Embedded Compact Extended Form Factor
The NLX form factor has a riser card on the edge of the motherboard.