SDRAM Question
SDRAM Question
What is the difference (if any)between high density and low density pc133 ram???
Akuma Matada
"Density" refers to the capacity (in bits) of each chip. Low density chips are usually 16, 32, 64 Mbit. Higher density chips are 128, and 256 Mbit. basically how you calculate the capacity of a DIMM is as follows: The per chip capacity (in Mbits) divided by 8, to get MBytes. Then multiply the number of MBytes by the number of chips to get the capacity of the DIMM.
So, a low-density DIMM might be a 64 MB DIMM comprised of 16 chips, 32 Mbits each (32 Mbit / 8 = 4 MBytes per chip, times 16 chips = 64 MBytes).
A high density DIMM might be a 256 MB module made up of 8 chips, 256 Mbits each (256 Mbit / 8 = 32 MBytes per chip, times 8 chips = 256 MBytes).
Older chipsets can't properly address high density chips, IIRC the old Intel 430 VX was limited to DIMMs with 16 MBit chips.
So, a low-density DIMM might be a 64 MB DIMM comprised of 16 chips, 32 Mbits each (32 Mbit / 8 = 4 MBytes per chip, times 16 chips = 64 MBytes).
A high density DIMM might be a 256 MB module made up of 8 chips, 256 Mbits each (256 Mbit / 8 = 32 MBytes per chip, times 8 chips = 256 MBytes).
Older chipsets can't properly address high density chips, IIRC the old Intel 430 VX was limited to DIMMs with 16 MBit chips.