The BLUE sata 0 connector is for the HDD the next sata connector is for the Optical drive. I've been told to replace the HDD with the bootable SDD in the SATA slot it currently boots from and move the HDD for storage to the next SATA slot. HOWEVER Larger than 2TB requires special drivers and or Host bus adapter. Older 80 Gig drives are 512e and work with all os including WIN95 and WIN98 etc.Īnd I've been told the Optiplex won't run without the factory HDD. It is fine to replace HDD EXCEPT that Advanced format drives REQUIRE AHCI or F6 Mass storage Drivers to be seen. (Advanced format drives are ANY HDD NEWER than 2011 AND larger than 120GIGS) SSD drives came out a lot later so ANY size SSD is Advanced format. I've been told it's okay to replace the HDD You can still find working ram but the ram is very specific LOW Density 533 MHz parts. MUST BE low density, MUST NOT BE ECC or Registered or buffered etc.

Some Small non tower models only have 2 slots so that's a problem for 8 gigs. '8GB I can upgrade to needs to be 4 x 2GB sticks ' Press the blue Accept as Solution button below if this answers your questions.

Optiplex 755 sff memory slots