Is that any different i7-870 and i7-870S?
I also checked on this site" it showed can compatible with i7-870.
Is it need to add-in a graphic card?
Well, it is either an mistaken omission, or there is some reason for it not being on the list:
You can compare the two here:
Yes, you would need a graphics card, which will be a challange with a board this old. Compatibility is the key here.
Also, what is your current bios revision?
Personally, I see no point in trying to upgrade a 1st gen processor. Your board is already 10 years old:
Rather than waste time and money on a ten year old board with a processor that may or may not work and having to find a compatible graphics card, I would invest in a new(er) system that is supported.