How to check which speed your memory is?

itz2000 · 05-17-2008, 02:27 AM

i.e : I would like to check if my memory is CL 2.5 or CL 3, and what its frequency (that one I know, but just want to make sure : 400 Mhz).

Tried to look for that info on /proc, but couldn't find something

Thanks

colucix · 05-17-2008, 03:02 AM

You can try the perl script decode-dimms.pl which comes with lm-sensors. Maybe you have to load the kernel module eeprom, since this module populates /sys/bus/i2c/drivers/eeprom/ and decode-dimms.pl looks at the information here and deciphers them in a human readable format. Here is an excerpt from mine:

Code:

Decoding EEPROM: /sys/bus/i2c/drivers/eeprom/0-0050
Guessing DIMM is in                             bank 1

---=== SPD EEPROM Information ===---
EEPROM Checksum of bytes 0-62                   OK (0xBD)
# of bytes written to SDRAM EEPROM              128
Total number of bytes in EEPROM                 256
Fundamental Memory type                         DDR2 SDRAM
SPD Revision                                    1.1

---=== Memory Characteristics ===---
Maximum module speed                            930MHz (PC7400)
Size                                            512 MB
tCL-tRCD-tRP-tRAS                               5-4-4-12
Supported CAS Latencies                         5, 4, 3
Minimum Cycle Time (CAS 5)                      3.75 ns
Maximum Access Time (CAS 5)                     0.5 ns
Minimum Cycle Time (CAS 4)                      3.75 ns
Maximum Access Time (CAS 4)                     0.5 ns
Minimum Cycle Time (CAS 3)                      5 ns
Maximum Access Time (CAS 3)                     0.6 ns