I dont know if you realize it, but your posts come of very anti-amd, no amd isnt "the best" anymore, but the fact is that most OEM boards Could run the chips, but most oem's DO NOT USE HIGH END AMD CHIPS, hell most of them dont even offer high end intel systems anymore, and if they do, they have one choice, even the so-called high end OEM's dont tend to offer high end AMD.
Alienware=Dell, so them even offering anything AMD is a miracle, only happening to avoid
lawsuits for themselves and intel.
voodoopc......to me they are kinda a joke these days
falconNW.....same deal, sure they can build you a high end AMD rig, but you could build you're self the same rig far cheaper......or have somebody locally build one for you.
I could list other sites that offer AMD systems that you could consider OEM's, but none of them that offer "high end" AMD stuff have even close to the market share of the top oem's like dell,hp,gateway,acer,exct the top OEM's have rarely offered the top end cpu's because honestly THEY DON'T MAKE ENOUGH MONEY OFF THOSE SYSTEMS, they make far more off the budget and mid range class systems and sell far more of them.
go to any bigbox system seller and see what they sell more of, low end, mid range or high end, most of them around here dont even offer what i would call high end systems, they offer mid range as high end and low and ultra low as your other choices.
on a side note, most OEM systems that have 120mm fans in them, don't use "low speed" fans they use high speed fans that are speed controlled by the board, example, pull the 120mm fan out of a dell, reconfigure the plug to work on a normal board, and plug it in, the fan will be LOUD AS HELL, and move ONE HELL OF ALOT OF AIR, in fact in the case of dell boxes, that fans MORE THEN ENOUGH to cool even the hottest of cpu's and keep the flow going to allow even high end videocards to be happy(dell may suck, but their case designs for mini and full towers are quite good for airflow most of the time)