No you just dont get it it. Athlon 64 cant run more than 2 dimms at 1T. They just can't. Nothing you can possible due can change that. Unless, somehow those 512mb dimms are single sided, but they arent. Venice/SD/X2 only drop to 2T with 3/4 dimms, while older a64 not only dropped to 2T but also dropped to drr 333. Lots of people OCed back up to ddr 400 though.
The deluxe had issues with the bios, alot of motherboards have where something doent work. With the deluxe/basic in an old bios 1T would work above ~220mhz on the fsb. That problem is ancient though. Like I said, there is no way to run 4 stick sof ram on a 64 without dropping to 2T. Hope I was clear enough