GA-Z68XP-UD5 Vs GA-Z68XP-UD5-B3

[nwinton]

Looking for a GA-Z68 motherboard with on-CPU graphics enabled (for encoding).
B3 motherboards seem to be a later revision but none of them have graphics

e.g. GA-Z68XP-UD5 has on-CPU graphics enabled
GA-Z68XP-UD5-B3 does not

Same for the UD4

Can anyone advise whether there is any performance difference between the B3 version (without graphics) and the other (?earlier?) version (with graphics).

TIA

[ex58]

Motherboard GA-Z68XP-UD5-B3 does not exist. 

[nwinton]

You are quite right - my mistake.
So my revised question is now:

What is the difference between the GA-Z68X-UD5-B3 and GA-Z68XP-UD5?
Is one more recent - are they the same product with the exception of on-CPU graphics?

http://www.gigabyte.com/products/product-page.aspx?pid=3848#sp  
GA-Z68X-UD5-B3 (rev. 1.0)

http://www.gigabyte.com/products/product-page.aspx?pid=3909#ov
GA-Z68XP-UD5 (rev. 1.0)