Found this :
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http://www.notebookcheck.net/Intel-HD-Graphics-4000.691...
Anno 2070 benchmarks both and the GT 610M comes up as 28% less performance than the Intel HD 4000.
In COD: MW3 the GT 610M is 10% faster.
In BF3 the GT 610M is 24% slower.
Both are about equal in FIFA 12 with the HD 4000 being 4% faster.
In F1 2011 the GT 610M is marginally faster by 7%.
Deux Ex: HR the GT 610M is slower by 12%.
In Crysis 2 the GT 610M is slower by 24%.
Mafia 2 the GT 610M is slower by 13%.
In StarCraft 2 the Intel HD 4000 is 2% faster than the GT 630M so that means it should be faster than the GT 610M by a wide margin.
Considering that the HD 4000 is only 6% slower than the GT 630M in Metro 2033, the HD 4000 is by default faster than the GT 610M.
WoW is a tie.