No, using all four slots will run the memory in dual channel, however latency will increase and you'll most likely need to use more vdimm, which will yield lower overclocking potential
In addition, some memory controllers cannot handle all four slots running at specific speeds and will be forced to underclock the memory, which will create a huge bottleneck in your system
i would recomend the g.skill gbgh cos their cheap (like $140) and they get up to around ddr500 wityh 2-2-2-5 and a decent amount of v.dimm most go higher than ddr500 with some going to 530 or 540
Okay, if I get 4x512mb g.Skill TCCD ram, will it be faster and overclock better on a DFI Lanparty nF4 SLI-DR mobo than 2x1gb w/e performance brand memory will?