being at 65 nm, the GPU heatsink returned to the original one used on the "Xenon". Xbox 360 S introduced a new motherboard version called "Trinity" with a 45 nm integrated CPU, GPU, and eDRAM. It consisted of 2 dies, one for the XCGPU, and one for the eDRAM. In 2011 a second model of the Xbox 360 S motherboard has been released known as "Corona" which integrates the HANA chip into the southbridge chip, and used either the traditional 16MB NAND, or a 4GB "Phison" eMMC. "Corona" was used in both the Xbox 360 S and Xbox 360 E. In August 2014, the "Winchester" model was released, with a new XCGPU. This chip removes the heatspreader and integrated the eDRAM into the main die on the XCGPU. This version also patches the "Reset Glitch Hack". List of revisions Connectivity to accessories The Xbox 360 features three USB 2.0 ports (two on the front, one on the back). The Xbox 360 S, however, has five USB 2.0 ports (two on the front, three in the back) along with a dedicated Kinect port. The Xbox 360 E has four ports (two on the front, two on the back) and a dedicated Kinect port. These are used for connection of accessories such as wired controllers, the wireless networking adapter, the Xbox Live Vision camera and USB storage devices. Although the number of wired controllers is limited by the number of ports, up to four may be used through the use of a USB hub. The Xbox 360 also features wireless connectivity of accessories via a proprietary 2.4 GHz radio system. This is mainly used to connect the official wireless controllers, but is also used for other devices such as the wireless racing wheel and wireless headsets. With the exception of some rhythm game controllers, and the Fanatec CSR wheel, this wireless connectivity is limited to first-party Microsoft accessories. The console can connect to Xbox Live over the Internet through a variety of networking interfaces. Original style consoles also have two front-mounted memory card slots for the system's proprietary Memory Unit. These can be used to transfer profile and game data from one Xbox 360 to another. Memory Units up to 512 MB are available from Microsoft. The "Arcade" model formerly came with a 256 MB Memory Unit, but with the Jasper motherboard revision of September 2008, the "Arcade" model began to include