Yes. The Intel CC820 motherboard has two DIMM slots that can use two single-sided DIMMs , two double-sided DIMMs or one single-sided DIMM and one double sided DIMM. In that case, the single-sided DIMM must be in the first slot.
DIMMs
168
like pci slot dimms slot..
DRAM
If you install DIMMS in all four slots that don't match, the memory will still work, just not at top performance.
The ATX form factor is an ancient one. Modules can range all the way from 72-pin DIMMS to DDR3.
DIMMs are the newer tech.
The specifications states that the two DIMM sockets on the board have these features: * 2.5V DDR SDRAM DIMMs * Unbuffered, single-sided or double-sided DIMMs * ** except for double-sided DIMMs with x16 organization * Non-ECC DIMMs * DDR 400MHz and DDR 333MHz SDRAM DIMMs It should support 1GB chips with the following organizations: * single-sided, 128Mbit x 8 front-side / empty back-side * double-sided, 64Mbit x 8 front-side / 64Mbit x 8 back-side If you are ever unsure about a specific memory module being compatible with a specific motherboard, you should always contact one or both manufacturers for clarification.
Answering "What are four types of SO-DIMMs used in a notebook?"
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
The only difference would be if your motherboard has dual channel capability. Check your manual to see. If it does then 2 x 256MB would be the faster option.
rimms