PC-66

NOTE! As PC66 is getting increasingly difficult to acquire, PC133 can be used instead. Using PC133 may or may not increase the performance of your model, as some models may underclock it to their respective original DRAM speeds. PC66 This is SDRAM at 66 MHz in a 144-pin SO-DIMM form-factor.

Available DRAM modules from IBM

SDR type	Option Part Number (OPT)	Field Replacement Unit (FRU)
Non-ECC, unbuffered 1Rx16 16MB PC66 CL2	76H0293	42H2818
Non-ECC, unbuffered 1Rx16 32MB PC66 CL2	76H0294	42H2819, 10L1226
Non-ECC, unbuffered 1Rx8 64MB PC66 CL2	76H0295, 20L0241	42H2820, 20L0242, 10L1227
Non-ECC, unbuffered 1Rx8 128MB PC66 CL2	01K1150	01K1151, 01K1153

Models that support this technology

Models	Soldered on motherboard	SO-DIMM Slot 1	SO-DIMM Slot 2	SO-DIMM Slot 3	Official Max-Memory	Unofficial Max-Memory
240	64MB	Depends	N/A	N/A	192MB	320MB1
390, 390E i Series 1720, i Series 1721	N/A	Occupied	Depends	N/A	256MB	512MB2
3905	N/A	Occupied	Depends	N/A	256MB	256MB3
570	64MB	Depends	N/A	N/A	192MB	320MB1
600, 600E	32MB	Occupied	Depends	N/A	288MB	544MB2
6005	N/A	Occupied	Depends	N/A	256MB	256MB3
770X, 770Z	N/A	Occupied	Occupied	Depends	320MB	768MB2 6
7704 5, 770E, 770ED	N/A (770) or 32MB	Occupied	Depends	N/A	256 (770) or 288MB	2563 (770) or 544MB2 6
i Series 1400, i Series 1410 i Series 1411, i Series 1412 i Series 1420, i Series 1421 i Series 1422, i Series 1441 i Series 1442, i Series 1450 i Series 1451, i Series 1452 i Series 1460, i Series 1472 i Series 1480, i Series 1482 i Series 1483, i Series 1492	N/A	Occupied	Depends	N/A	256MB	512MB2
i Series 1500, i Series 1512 i Series 1540, i Series 1541 i Series 1542, i Series 1552 i Series 1560, i Series 1562 i Series 1592	N/A	Occupied	Depends	N/A	256MB	512MB2

FOOTNOTES [Δ]

1. Attained via one 2Rx8 256MB PC100 non-ECC SO-UDIMMs, not possible with 1Rx8 256MB PC100 non-ECC SO-UDIMMs.
2. Attained via two 2Rx8 256MB PC100 non-ECC SO-UDIMMs, not possible with 1Rx8 256MB PC100 non-ECC SO-UDIMMs.
3. Attained via two 1Rx8 128MB PC66 non-ECC SO-UDIMMs.
4. This model accepts EDO 60ns DRAM, but it is not recommended to use older DRAM technology.
5. This model uses the 430TX chipset, which means it is hardware-limited to 256MB of RAM as its maximum capacity.
6. Due to some odd limitation of the motherboard or the BIOS, the maximum amount of RAM that can be detected is 512MB.

Available DRAM modules from other companies

Manufacturer	Partnumber	Description	Tested on model
TBD	TBD	TBD	TBD