CPU upgrade and BIOS compatibility

[jb2559]

I have a Lenovo Thinkpad SL500 that has a Intel Core 2 Duo T5670 1.80 GHz CPU and I am going to uprade it to an Intel Core 2 Duo T9400 1.53 GHz CPU. Will I need to upgrade the BIOS before I make this change.? My motherboard is a Lenovo Boxster.

 

[NerdyComputerGuy]

Exact model of motherboard?

 

[jb2559]

This is the results from Speccy:
Manufacturer LENOVO
Model BOXSTER (Socket 478)
Version ThinkPad SL500
Chipset Vendor Intel
Chipset Model GM45/GM47
Chipset Revision 07
Southbridge Vendor Intel
Southbridge Model 82801IM (ICH9-M)
Southbridge Revision 03

 

[jb2559]

Exact model of motherboard?

Manufacturer LENOVO
Model BOXSTER (Socket 478)
Version ThinkPad SL500
Chipset Vendor Intel
Chipset Model GM45/GM47
Chipset Revision 07
Southbridge Vendor Intel
Southbridge Model 82801IM (ICH9-M)
Southbridge Revision 03