Lightning said:
Sonic classic collection suns a bit smoother on my dsi!(original cardridge)
That means it may use the eternal CPU of the DSI.
The DSi does not use an eternal CPU, it has increased RAM.
But it does have a better CPU compared to the DSL. Thus technically what Lightning said is not true but still has a bit of it in a way. Double CPU speed = practically a new processor compared to the old one (with the speeds we are talking about).
Wikipedia
Technical specifications
The DSi has more RAM and a faster CPU than the DS Lite;[69] the CPU was also relocated, and the battery housing raised to fill the unused space.[2] Developers reported the console enters one of two modes for running software; a native mode, allowing access to the system's extra processing and memory resources for DSi-exclusive software and a compatibility mode for software able to run on DS and DS Lite consoles.[70][71] Due to the inclusion of Codec IC, which amplifies sound and converts digital signals to analog, the DSi's audio output is louder and higher quality than previous DS models.[2]
The console does not include the Game Boy Advance (GBA) cartridge slot present on earlier models; Nintendo explained that its removal improved portability without sacrificing durability.[44] Because of this, the DSi is not backward compatible with GBA Game Paks, or with accessories that require the GBA slot, such as the Nintendo DS Rumble Pak and the Guitar Hero: On Tour series guitar grip.[72]
* CPU: The DSi has two ARM architecture CPUs; ARM9 and ARM7.[cn 1] The ARM9 is clocked at 133 MHz (almost twice as fast as previous models).[69][73][74]
* RAM: 16 MB of RAM (four times as much as previous models)[54]
* Storage: 256 MB of internal flash memory[76] with a SD card (up to 2 GB) and SDHC card (up to 32 GB) expansion slot[77]
* Wireless: 802.11b/g internal wireless connectivity[55]