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# RAM Allocation Guide
When developing homebrew for the Nintendo 3DS, available RAM depends heavily on two factors: how your application is packaged (.3dsx vs. .cia) and the console hardware (Old 3DS vs. New 3DS).
## 1. Homebrew Launcher (.3dsx) vs. Installed CIA (.cia)
### .3dsx (Launched via Homebrew Launcher)
When launching a .3dsx file, your application inherits the memory constraints of the host application used to exploit the system (usually the Nintendo 3DS Sound app or the internet browser via safehax).
* **Available RAM**: You are generally limited to roughly 32 MB to 64 MB of linear memory, as the system allocates the rest to the operating system and the host applet.
* **Limitation**: You cannot request extended memory modes or access New 3DS-exclusive RAM via a .3dsx file.
### .cia (Installed to Home Menu)
An installed .cia acts like a native retail game. It uses a Result Spec File (.rsf) during compilation to explicitly tell the 3DS OS how much memory to allocate and which CPU mode to use.
## 2. Memory Modes & .rsf Flags (Old 3DS vs. New 3DS)
The Old 3DS has 128 MB of total RAM, while the New 3DS has 256 MB. How you configure your .rsf file determines how much of this memory your app can touch.
| Memory Mode | Available RAM | O3DS Behavior | N3DS Behavior |
|-------------|---------------|---------------|---------------|
| **Application (Default)** | **64 MB** | Standard mode. System applets (Friends list, Browser) remain suspended in the background. Quick launch/exit. | Standard mode. Works identically to O3DS. |
| **SystemMode32** | **32 MB** | Limits the app to 32 MB. Historically used by simple tools to slightly decrease boot times. | Works identically, but rarely used for homebrew. |
| **SystemMode4 (Extended Memory)** | **80 MB** | **Requires App Reboot**: The OS terminates background applets to free up an extra 16 MB. Exiting to the Home Menu forces a console soft-reboot. | **No Reboot Needed**: Because the N3DS has 256 MB of RAM, it can grant 80 MB easily without closing background applets. |
| **SystemMode5 (Extended Memory)** | **96 MB** | **Requires App Reboot**: Used by late-generation heavy games (e.g., Super Smash Bros.). Frees up 32 MB by completely shutting down the Home Menu/OS applets. Exiting forces a long soft-reboot. | **No Reboot Needed**: The N3DS handles this natively without needing a soft-reboot. |
**Example of Extended Memory Usage:** Super Smash Bros. 3DS and Monster Hunter 4 Ultimate use SystemMode5 (96MB) on an Old 3DS, causing the famous "soft-reboot" when you close them.