R700p and virgin superhub 4

So after upgrading to 1gb internet and receiving a super hub 4 i switched the super hub 4 to modem mode and connected my r7000p however when i did a wired speed test my top speed was 335mb however when i do a wired speed test to the super hub i get over 1000mb. I have disabled traffic meter but still only getting a third of the speed does anyone have any ideas?