Here is some questions about the r4 card which i always see in the forum. Just colect them and answer them here, hope this can help you:
1. What is r4 card?
The original r4 card just support play ds roms on ds console, and it just support 2G sd card. We always say r4 card means the r4 series such as r4i gold 3ds, r4i sdhc 3ds and r4i dual core etc.. All these card can work ds roms on 3DS and dsi and ds. and support max 32 G sd card.
2. Does r4 card support play 3ds games?
No, no card can play 3ds games. what we use it is just for playing ds roms on 3DS consoles. even the stronggest card dstwo cannot play 3ds games.
3. What do i need to do when i buy the r4 card.
Every r4 card has its own official site, when you buy a r4 card, please check its official site on the lable, and download its kernel on the official site. put the kernel and ds roms in the sd card, then you can work the r4 card on your ds / dsi / 3ds.
4. Which r4 card is best?
There are so many r4 series card in the market, the best one i think is r4i gold 3ds, this card use wood kernel and its update is very quick. The card quality is great, hard to break and easy to use. cheap price with good quality, even if the card is broken, you can fix it by the update patch.
5. Where to buy r4 card?
On the r4i gold 3ds official reseller list, there are many resellers, you can choose your favorite one. My best experience is with www.game4deal.com, they are r4 card wholesaler, very professinal and the shipping time is very quick.