how to identify my ps2 model

[Warlock]

Here ya go, 8 screws is a version4

If it begins with u1 you have version 1
If it begins with u0 you have version 2
If it begins with u2 you have version 3
(Note: Some PS2s with serial number u2 may have a version 4 board.)
If it begins with u3 you have version 4.
If it begins with u4 you have version 4