Bands Heavier/Harder Than Suicide Silence?

These guys are really extreme and loud, but is there anything harder than these guys, I have heard cannibal corpse (I don't like them) but I wouldn't say they are heavier they are just more gore influenced. So is there anything heavier etc.. (please don't say stuff like Slayer etc.. compared to all the grindcore stuff around its not as extreme as it was.)