that is a weird mixture of ram modules, supposedly your mainboard will accept 6 modules of ram
https://www.asus.com/Motherboards/P6T_Deluxe/
the ram compatibility list is there
https://www.asus.com/Motherboards/P6T_Deluxe/HelpDesk_QVL/
it says 6 modules, each module of 4 gbs to have a maximum of 24 gbs of ram, i don't think it will 100% work, could work but perhaps will detect it as a 1 gb ram module or less
have you considered to move to a newer platform with support for bigger ram modules? ideally 16 gbs is enough for at least 3 more years, but your idea of perhaps 12 slow gbs, well, not sure if can work or if is worth to try it