so quick question, just sold my sp4 128gb i5. need a bit more gaming capability,was limited due to 4gb. sp4 i7 256gb ,8gb . 540 iris about 1000£ or SB i5 dgpu nv,256gb 8gb 1300£. 300£ difference,wondering if that deserve the gaming perfomance of SB instead of Sp4 with hd540.