I/O panel and remote control. In 2007 Creative Technology unveiled PCI Express x1 and ExpressCard/34 versions of Sound Blaster X-Fi Xtreme Audio during Consumer Electronics Show. Creative did not yet release PCIe versions of their EMU-based X-Fi cards as adapting the CA20K1 chip for PCIe proved to be troublesome, with the company itself reporting design difficulties, latency problems and delays. In 2008 the X-Fi Titanium series was announced, using the revised CA20K2 chip, which featured an integrated RISC processor for safeguarding against PCIe-induced latencies, a DDR SDRAM interface in place of SDRAM, and an integrated High Definition audio architecture (UAA) component. Products included the Fatal1ty cards with 64 MB X-RAM and an optional I/O drive bay, and the regular Titanium with 16 MB X-RAM, but the same 109 dB SNR spec as the former. Unlike the PCI cards, these cards use software-based Dolby Digital Live 5.1 encoding. In 2010 the Titanium HD was added to the lineup, featuring a new DAC with 122 dB SNR and RCA audio outputs, but dropping support for Windows XP. X-Fi USB products In addition to PCI and PCIe internal sound cards, Creative also released an external USB-based solution (named X-Mod) in November 2006. X-Mod is listed in the same category as the rest of the X-Fi lineup, but is only a stereo device, marketed to improve music playing from laptop computers, and with lower specifications than the internal offerings. Other external products that use X-Fi name include USB-based Sound Blaster X-Fi HD, Sound Blaster X-Fi Surround 5.1 Pro, and Sound Blaster X-Fi Go! Pro, Their internal hardware components are different for various usages and needs for gaming, surround, or audiophile standards. X-Fi features The audio processor on X-Fi was the most powerful at its time of release, offering an extremely robust sample rate conversion (SRC) engine in addition to enhanced internal sound channel routing options and greater 3D audio enhancement capabilities. A significant portion of the audio processing unit was devoted to this resampling engine. The SRC engine was far more capable than previous Creative sound card offerings, a limitation that had been a major thorn in Creative's side. Most digital audio is sampled at 44.1 kHz, a standard no doubt related to CD-DA, while sound cards were often designed to process audio at 48 kHz. So, the 44.1 kHz audio must be resampled to 48 kHz (Creative's previous cards' DSPs operated at 48