![memory slots used 2 of 4 memory slots used 2 of 4](https://img.izismile.com/img/img8/20151008/640/now_you_can_make_your_own_awesome_minions_goggles_at_home_640_high_05.jpg)
To remove the SO-DIMM module, gently spread the two metal clips outward (away from the module). On both sides, the slot's metal arms will spread automatically and click into the side notches on the SO-DIMM module. Then, gently press the module downwards (to a flat position parallel with the computer board) until it clicks into place. To insert a SO-DIMM module into the slot, gently insert it at approximately a 30-degree angle upwards, until the module's metal contacts disappear into the slot. Simply flip the module over if needed to align. SO-DIMM modules and slots are keyed, so modules can only be inserted in one orientation. Some SO-DIMMs provide ECC functionality unbuffered ECC SO-DIMMs are called SO-CDIMMs. 260-pin UniDIMMs contain DDR3 or DDR4 SDRAM depending on configuration. ĭDR2 SO-DIMM memory modules commonly have clock speeds from 200 MHz upward ( specifications). For example, DDR3 SO-DIMMs provide clock speeds such as 533 MHz (1066 MT/s, PC3-8500), CAS latencies such as 7, and higher capacities such as 4 GB per module. SO-DIMMs are nearly equal in power and voltage rating to DIMMs SO-DIMM technology does not mean lower performance compared to larger DIMMs. The lower voltage modules are sometimes, but not always, identified as DDR3L – see also DDR3 SDRAM.Ģ00-pin and 204-pin SO-DIMMs are 67.6 mm (2.66 inches) long, 31.75 mm (1.250 inches) wide, having a maximum total depth of 3.8 mm (0.15 inches). These modules, while using the same physical layout, may differ in the specified voltage – 1.5 or 1.35 volts. DDR SO-DIMMs operate at 2.5 V while DDR2 SO-DIMMs operate at 1.8 V. This variance is designed to prevent coupling of memory and controllers of different DDR generations due to electrical incompatibility. The different notch locations are designed to prevent cross-installation, aiding at the same time in visually identifying 200-pin SO-DIMM modules. These two types of memory are not interchangeable. In both cases the notch is located at one fifth of the board length (20 pins + notch + 80 pins), but in DDR2 the notch is located slightly closer to the center of the board. The 200-pin SO-DIMM can be of the types DDR and DDR2.