TerryKIt/they should. That 12 volt output though is 120 watt maximum. The supply total wattage is not to exceed 150 watt (the fine print under the chart). With that mentioned I would be surprised if the outputs could not be loaded heavier at the expense of greater ripple in the output. Some PC supplies however are intelligent enough to shut down if it detects a severely overloaded output.
Since you mentioned the supplies have not yet been purchased, I would suggest taking another look at single output supplies such as a Meanwell LRS-150-12 unless you have specific reasons for leaning towards a PC supply.