Because it is difficult to see this clip with. Lenovo ThinkCentre M83 Business Class Gaming Desktop - Quad Core i7 Ghz, 16GB DDR3 RAM, GB SSD, NVIDIA GT 4GB DDR5, teclado, mouse, WiFi. PCI Express card slots come with a clip that needs to be pulled back in order to release the card. However, the PC claims it can't find an OS on startup. I recently installed a PCIe SSD to my ThinkCentre M83 and installed Linux on it. . Lenovo ThinkCentre M83 Business Class Fast Gaming Desktop Core i7 Ghz, 16 GB de RAM, GB SSD, NVIDIA GT 4GB DDR5, teclado, mouse, WiFi.