the main difference is that first off, the megahalems has a gap down the center, allowing more space in a push/pull config for the pull fan to suck inn a small amount of additional air, and the mounting mechanism on the ven-x has the better mounting pressure. i personally would get the ven-x if i were getting a new cooler, but vs my 2500 grit lapped megahalems its not worth the upgrade here, just not a big enough difference to warrant spending another $70ish lol