The X-Fi series is based on the E-Mu 20K1 processor chip, which was created in 2005. Cards are built around the 20K1 (CA20K1), which requires a host CPU to control it, or the 20K2 (CA20K2), which has a built-in RISC processor. It is a 51-million-transistor chip fabricated using a 130 nm process and runs at 10,000 million instructions per second (MIPS)
The X-Fi cards have a sound-to-noise ratio ranging from 109 dB to 122 dB and were produced with onboard RAM anywhere from 2MB to 64MB.
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