No entiendo mucho sobre este tema pero dependiendo que tipo de memoria utilices como la r4 coge 4gb no?la r3 3 gb dependiendo de cada tarjeta se necesites su sistema operativo para cada una si no me equivoco no?
para la hora de bajar juegos no importa que tarjeta utilices siempre que tengas instalados bien el sistema opertivo a cada tarjeta que tengas puesta conel nombre este que seria (system).

bien si utilizas algun programa como el bittorrent,el bitcoment el azureus etc etc.......te los puedes bajar los juegos de esta pagina que te dejo y te valen y no creo que te den problema ninguno.

http://www.gamestorrents.com/juegos-nds-bittorrent.html

espero sea de tu ayuda:

saludos:

Aqui te dejo unos 60 juegos para la nintendo ds tambien la descarga es direta espero te sisva tambien:
------------------------------------------------------------­-----------------------------------------------Animal Crossing Wild World.nds
http://www.megaupload.com/?d=T7J0JBQY

Assasin-’s Creed Altair-’s Chronicles.nds
http://www.megaupload.com/?d=RU9J948J



Barbie y las 12 princesas bailarinas.nds
http://www.megaupload.com/?d=S4S6ADM5



Big Brain Academy.nds
http://www.megaupload.com/?d=A9FY52BS



Boogie.nds
http://www.megaupload.com/?d=VH3N0I2W



Brain Challenge.nds
http://www.megaupload.com/?d=MXE5DTU7



Brain Training.nds
http://www.megaupload.com/?d=HHHAUDB4



Brain Training 2.nds
http://www.megaupload.com/?d=NI7L5EPR



Bratz.nds
http://www.megaupload.com/?d=G5MW4NIX



Brothers in Arms.nds
http://www.megaupload.com/?d=MX6VYJFR



Call of duty 4.nds
http://www.megaupload.com/?d=4CW9HWE0



Cars.nds
http://www.megaupload.com/?d=SZW5MR5G



Catz 2.nds
http://www.megaupload.com/?d=0JLO9GYF



Cooking Mamma2.nds
http://www.megaupload.com/?d=FXXE4ZN1



Dogz 2
http://www.megaupload.com/?d=QW4F185E



Cronicas de Narnia.nds
http://www.megaupload.com/?d=W5RDJ41X



Disney Princess Joyas Magicas.nds
http://www.megaupload.com/?d=ECXVWFIQ



Dolphinz.nds
http://www.megaupload.com/?d=IV5WZ0CR



Donkey Kong Jungle Climber.nds
http://www.megaupload.com/?d=JD1LY2PA



Encantada.nds
http://www.megaupload.com/?d=67A4THNY



F24 Stealth Fighter.nds
http://www.megaupload.com/?d=4IY4WULW



Final Fantasy XII Revenant Wings.nds
http://www.megaupload.com/?d=42DWXM4R



Ford Racing 3.nds
http://www.megaupload.com/?d=QYJKOR7O



Hamsterz 2.nds
http://www.megaupload.com/?d=G2U7AFH0



Hannah Montana.NDS
http://www.megaupload.com/?d=ER9JBZGH



Horsez.nds
http://www.megaupload.com/?d=LGJEEYA0



Imagina ser Mama.nds
http://www.megaupload.com/?d=TA0O9W2Y



Imagina ser Cocinera.nds
http://www.megaupload.com/?d=QZQT78DI



Imagina ser Diseñadora.nds
http://www.megaupload.com/?d=IPLQJ66I



Imagina ser Veterinaria.nds
http://www.megaupload.com/?d=FZ3MRBKU



Las Cronicas de Spiderwick.nds
http://www.megaupload.com/?d=ZCP4NO8N



Mario Kart.nds
http://www.megaupload.com/?d=EI1P16QX



Mario Party.nds
http://www.megaupload.com/?d=HVXNO4IL



Mario y Sonic en los Juegos olimpicos.nds
http://www.megaupload.com/?d=WC4DD888



MegaMan_ZX_Advent.nds
http://www.megaupload.com/?d=IAKARPBL



Metroid Prime Pinball.nds
http://www.megaupload.com/?d=NBBT47FF



Mis Sims.nds
http://www.megaupload.com/?d=03SM9ZMU



My Horse & Me.nds
http://www.megaupload.com/?d=XAMXVDKE



My Puppy Shop.nds
http://www.megaupload.com/?d=WZLNZVWN



Naruto Ninja Destiny.nds
http://www.megaupload.com/?d=OGIRGFAA



Nintendogs - Dalmata.nds
http://www.megaupload.com/?d=23KVVBWP



Nintendogs Chihuahua.nds
http://www.megaupload.com/?d=LO1LCJ03



Paint DS.nds
http://www.megaupload.com/?d=4NHYKKFI



Pokemon.diamante.nds
http://www.megaupload.com/?d=LQM41NVX



Practica Ingles
http://www.megaupload.com/?d=VCBYJD02



Pro Evolution Soccer 2008.nds
http://www.megaupload.com/?d=9E95XNUI



Ratatouille.nds
http://www.megaupload.com/?d=RSFHSUSA



Ratonpolis .nds
http://www.megaupload.com/?d=AS0U181D



Robots.nds
http://www.megaupload.com/?d=U34B2RUT



Scooby-Doo - Who’s Watching Who.nds
http://www.megaupload.com/?d=WUKM9ENX



SEGA Superstars Tennis.nds
http://www.megaupload.com/?d=IT9U5RL1



Sin Chan Flipa en colores.nds
http://www.megaupload.com/?d=WKE1VMB9



Super Mario 64 DS.nds
http://www.megaupload.com/?d=2DDM9UGS



Tetris DS.nds
http://www.megaupload.com/?d=TLT5SU0B



Tiger Woods PGA Tour .nds
http://www.megaupload.com/?d=YG7UGY9C



Training for your eyes.nds
http://www.megaupload.com/?d=AQR5SZTX



TraumaCenter.nds
http://www.megaupload.com/?d=TOFMPCC0