Then there is sth wrong with your GPU . A GTX 260 / AMD 5770 or better GPU can hit 4x IR in most games due to high memory bandwidth
My 9800GT GDDR3 which is so much slower than your GPU but it can handle 3xIR without an issue
Think about it , if your Intel HD 4600 can hit 2.5xIR in most games , that means your GTX 770M isn't that much faster than an integrated GPU !
My 9800GT GDDR3 which is so much slower than your GPU but it can handle 3xIR without an issue
Think about it , if your Intel HD 4600 can hit 2.5xIR in most games , that means your GTX 770M isn't that much faster than an integrated GPU !
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