Anyone on here that's been around and gives advice, knows what they're talking about, or else they wouldn't be saying anything man. If you want more input, you can easily Google Corsair H50 and look at reviews and peoples temps they've gotten on the i7 on numerous forums. With that said, check out Slaymate's review of the H70, it's a great one.
You can't compare temps from a different processor using the cooler you want for yours. An i7 at 4Ghz, is going to run hot. Even if the H50 does an "OK" job, you'll still see lower temps on other coolers and the H70.