Intel Q6600 on P4M900 Chipset

can i put an intel quad Q6600 / Q6700 on my ECS P4M900T-M2 mobo?

ECS CPU support
http://www.ecs.com.tw/ECSWebSite/S [...] 69&LanID=0

BIOS for intel E5200 45nm
http://www.ecs.com.tw/ECSWebSite/P [...] 44&LanID=0

Foxconn mobos with P4M900 chipset - core 2 quad supported
http://www.foxconnchannel.com/prod [...] VIA+P4M900

i've search other mobo manufacturer with the same chipset but it is not supported.

gigabyte p4m900 cpu support
http://www.gigabyte.com.tw/Support [...] uctID=2581

ASUS P5VD2-MX SE
http://www.cpu-upgrade.com/mb-ASUS/P5VD2-MX_SE.html

MSI P4M900M3-F
http://www.cpu-upgrade.com/mb-MSI/ [...] 7387).html

i've already checked their official websites and they have the same data

and also, some mobos that doesn't support q6600 supports x6800

i'm a bit confused. my current cpu is intel e2140.

thanks for anyone who can help me.
thnx

same chipset different cpu support on different manufacturers. why?

thanks for the reply anyway.