Dell Inspiron 3521 Laptop RAM Upgrade

rahul2013

Standard Member
Hi


I am using a Dell Inspiron 3521 Laptop. I want to upgrade my RAM from 4 GB to 8 GB.
I call the dell tech support to check the specifications of my current RAM .They told me its DDR3L1600MZ RAM
However when i ran CPUID on my laptop i found the output contained line: Max bandwidth PC3-12800 (800 MHz).
Now I am confused my RAM is 800 MHZ or 1600 MHZ.
Can someone help ??


Chipset
-------------------------------------------------------------------------

Northbridge Intel Ivy Bridge rev. 09
Southbridge Intel HM76 rev. 04
Memory Type DDR3
Memory Size 4 GBytes
Channels Single
Memory Frequency 798.1 MHz (1:6)
CAS# latency (CL) 11.0
RAS# to CAS# delay (tRCD) 11
RAS# Precharge (tRP) 11
Cycle Time (tRAS) 28
Command Rate (CR) 1T
MCHBAR I/O Base address 0x0FED10000
MCHBAR I/O Size 19456
MCHBAR registers

Memory SPD
-------------------------------------------------------------------------

DIMM # 1
SMBus address 0x52
Memory type DDR3
Module format SO-DIMM
Manufacturer (ID) Samsung (CE000000000000000000)
Size 4096 MBytes
Max bandwidth PC3-12800 (800 MHz)
Manufacturing date Week 13/Year 13
Number of banks 8
Nominal Voltage 1.35 Volts
EPP no
XMP no
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 5.0-5-5-14-19 @ 380 MHz
JEDEC #2 6.0-6-6-16-22 @ 457 MHz
JEDEC #3 7.0-7-7-19-26 @ 533 MHz
JEDEC #4 8.0-8-8-22-30 @ 609 MHz
JEDEC #5 9.0-9-9-24-33 @ 685 MHz
JEDEC #6 10.0-10-10-27-37 @ 761 MHz
JEDEC #7 11.0-11-11-28-39 @ 800 MHz

DIMM # 1
SPD registers
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00 92 11 0B 03 04 21 02 01 03 11 01 08 0A 00 FE 00
10 69 78 69 30 69 11 18 81 20 08 3C 3C 00 F0 83 01
20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30 00 00 00 00 00 00 00 00 00 00 00 00 0F 11 41 00
40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70 00 00 00 00 00 80 CE 02 13 13 35 EE 34 FA 56 47
80 4D 34 37 31 42 35 31 37 33 43 42 30 2D 59 4B 30
90 20 20 00 00 80 CE 00 00 00 53 30 32 47 30 30 30
A0 01 00 01 01 00 FF 00 00 00 00 00 00 00 00 8D 05
B0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
C0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
D0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 

EndlessWaves

Distinguished Member
Now I am confused my RAM is 800 MHZ or 1600 MHZ.

You've got DDR3L-1600 / PC3L-12800 memory.

Technically speaking it's more correct to say DDR3-1600 runs at 800Mhz, that's a frequency that's actually in use. Doubling the value and calling it a frequency (in this call '1600Mhz') was a piece of marketing trickery from the early days of DDR to give an impression of it's speed compared to earlier types of memory. It sadly didn't die out when it should and now it's more confusing them helpful.
 

rahul2013

Standard Member
Thanks for the reply :) EndlessWaves
Now i understand the difference.

Can you also tell me the CAS latency of my RAM (From the CPUID output in my first post)?
 

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