A dual inline memory module (DIMM) consists of a number of memory components (usually black) that are attached to a printed circuit board (usually green). The gold pins on the bottom of the DIMM provide a connection between the module and a socket on a larger printed circuit board. The pins on the front and back of a DIMM are not connected to each other.
184-pin DIMMs are used to provide DDR SDRAM memory for desktop computers. Standard 184-pin DIMMs are available in PC1600 DDR SDRAM, PC2100 DDR SDRAM, PC2700 DDR SDRAM, and PC3200 DDR SDRAM.
To use DDR memory, your system motherboard must have 184-pin DIMM slots and a DDR-enabled chipset. A DDR SDRAM DIMM will not fit into a standard SDRAM DIMM socket. (Information about which memory technology your system uses is included in the Crucial Memory Advisor™ tool.)
The number of black components on a 184-pin DIMM can vary, but it always has 92 pins on the front and 92 pins on the back, for a total of 184. 184-pin DIMMs are approximately 5.25 inches long and 1.25 inches high, though the heights can vary. While 184-pin DIMMs and 168-pin DIMMs are approximately the same size, 184-pin DIMMs have only one notch within the row of pins.
I even tried booting Type 1 ram by itself, and my PC still refuses to boot.
The two parts are basically the same. When you order online by system information, you are shown what we refer to as an “external” part number, in your case number CT4027395. It is a system specific number and is mapped exclusively to the Lenovo IdeaPad Z400. The longer part number, CT1064BF160B, is the one that would you see printed on your module, and that is the actual module part number, or the "base" part number. There are other specifications to memory than the basic ones published on the site, and they sometimes requires us to filter out a certain build of a part for a specific system. The external part number can accomplish this, since we can build filters into them when necessary. Those filters are also the reason that we can only guarantee compatibility if you order by system; the external part number tells us which computer you are ordering for. If you order by specifications we don't know what model of computer you have, and that makes it impossible to guarantee compatibility.
I'm trying to find out some more specs for this part:
Specifically, I need to know what LRDIMM Register is being used on this part, I'm hoping it's one of the InPhi GS02A ones like listed on:
But I see that Part number different from what was ordered, so it's hard for me to know.
Being able to download a copy of the SPD would be great as well.
Thank you for contacting us today. Your system actually can use 1600mhz RAM. We have done extensive testing on our end to guarantee compatibility. As long as you are purchasing from the compatibility list you will not have any issues upgrading your RAM.
In some cases manufacturers may not be able to test new memory module speeds after the system has been released, and this may be why you are not seeing this speed listed. Please let me know if you have any other questions or concerns.