SDRAM

CT60 DON'T RUN WITHOUT SDRAM !

The CT60 supports the PC-100 & PC-133 standard SDRAM DIMMs, but some obsolet or uneeded DIMMs are not accepted.

In general, PC market provides Unbuffured 64-bits models, what you need for CT60.

 

ATTENTION : Don’t confuse SDRAM (logical) banks (2 or 4 into a chip) with DIMM (physical) banks (Single or double side DIMM) !

 

SDRAM DIMMs for CT60

- Must be PC-133. PC-100 is not recommended.

- Must support a CAS LATENCY (CL) of 2. CL = 3 may work  with PC133...

- Must be UNBUFFURED.

- Must be populated with 4 logical banks chips (2 banks, obsolet, are refused). All DIMM > 32MB use 4 banks chips.

- 64 Bits (no Parity / ECC = 72 / 80 bits).

 

MODULE CHIPS / SIDE SIDE ?

 (Single/double)

  CHIPS ARCHITECTURE

PAGE Size

Banks 1 to 4
64 MB 8 1 8M x   8 bits 8KB
64 MB 4 1 8M x 16 bits 8KB
128 MB 8 2 8M x   8 bits 8KB
128 MB 4 2 8M x 16 bits 8KB
128 MB 8 1 16M x   8 bits 16KB
128 MB 4 1 16M x 16 bits 8KB
256 MB 8 2 16M x   8 bits 16KB
256 MB 4 2 16M x 16 bits 8KB
256 MB 8 1 32M x   8 bits 16KB
512 MB 8 2 32M x   8 bits 16KB
512 MB 4 2 32M x 16 bits 16KB

 

NOT SUPPORTED SDRAM DIMMs

- All PC100 DIMM that doesn't support CAS LATENCY (CL) of 2. PC133 DIMM with CL=3 seem to work... 

- All OBSOLET models :

- 8MB, 16MB & 32MB DIMMs.

- 64MB DIMMs with 16 chips and/or chips on the 2 sides.

- All DIMMs with 2 logical banks chips (needs 4 banks chips).

- REGISTERED / BUFFURED DIMMs (generally for Work Stations & Servers, not consumer PC).

- All DIMM with only TWO chips on one side (32-bit data width chips).

- 512 MB DIMM with chips on 1 side.