Your SL45Y is a cB0 stepping processor. The latest is cC0.
You can find out the week of manufacture by reading the FBO/Batch Number, the week of manufacture being the 3rd and 4th digit, ie L034xxxx means
L = manufacture plant
0 = Year 2000
34 = week 34
Traditionally the SL45Y from the Philippines has been a poor overclocker.