Going From 2GB RAM to 4GB What is H/W Remap And S/W Remap In BIOS?

I currently have a Gigabyte GA-K8N-SLI Pro motherboard. Well I also currently have two Kingston KVR400X64C3AK2 1GB memory sticks giving me 2GB in dual channel mode. Well I've decided to upgrade my ram to 4GB so I bought me two more of the Kingston KVR400X64C3AK2 1GB sticks to give me 4GB. My questions is do I need to change anything in the BIOS for the other two memory sticks to be recognized like timings or voltages or anything? I'm currently using the F10D bios for my board. Also would H/W Remap (4G Support) and S/W Remap (4G Support) need to be enable for the memory to work right? Basically what do I need to do to get all 4 identical sticks working together and in dual channel mode? What changes? Everything else in the BIOS for RAM seems to be set up for automatic detection. It's just I don't know what I should do with the H/W Remap (4G Support) and S/W Remap (4G Support) if they should be enable and also if there is anything else I need to do?

Operating System: Windows XP 32Bit SP3 Professional

Motherboard: Gigabyte GA-K8N-SLI Pro

Processor: AMD Athlon 64 X2 4800+ (2400Mhz)

Memory: 1GB X 2 (2GB) Kingston KVR400X64C3AK2/2G (Wanting to go to 4GB all stick will be identical cause I bought some more from e-bay exactly the same as these)

Video: GIGABYTE GV-R489OC-1GD Radeon HD 4890 1GB

Sound: Creative Sound Blaster Audigy

Power Supply: Corsair 1000W

Hard Drives: 2 Seagate 250GB SATA 3/Gbs

DVD/CD: DVD/CD Burner and DVD Reader

Floppy Drive