HP Elitebook 8540w problem with 4gb 1600 Mhz

[SmurfOne]

hi Paul

Very good information you provided but i want to make things easy for me and not remove the one under the keyboard and only change one dimm from 2 to 4 gb

so i intend to keep one of existing :

(info extracted wit CPU-Z)

DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format SO-DIMM
Manufacturer (ID) Elpida (7F7FFE0000000000000000)
Size 2048 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number EBJ21UE8BDS0-DJ-F
Serial number 1A3706D8
Manufacturing date Week 09/Year 10
Number of banks 8
Nominal Voltage 1.50 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 6.0-6-6-17-23 @ 457 MHz
JEDEC #3 7.0-7-7-20-27 @ 533 MHz
JEDEC #4 8.0-8-8-22-30 @ 609 MHz
JEDEC #5 9.0-9-9-24-33 @ 666 MHz

and replace the second one with the one in the thread :

kingstone Artikelnr: KCP313SS8/4      EAN: 0740617253665

https://www.extremeit.se/kingston-mem-4gb-1333mhz-sodimm-single/cat-p/c/p8584154

will it work to mix a 2gb and  a 4gb dimm ?

thx in advance

[Paul_Tikkanen]

Hi, @SmurfOne 

It will work, but that is not a good configuration to have because when you mix different capacities of memory, it only runs at the single data rate (SDR) mode instead of DDR mode.

Some folks would argue that you are better off adding another 2 GB module and have 4 GB running in DDR mode, then having 6 GB running in SDR mode.

Did you have a problem getting the keyboard off?

I have an Elitebook 6930p which looks much like your notebook and I had the keyboard off in less than 2 minutes.

Mine had 3 screws in the bottom with a keyboard illustration, and 4 plastic tabs between the Fn keys that you slide toward you.  The the keyboard lifts up.

I did not remove the keyboard cable.  I just held it up, removed the 1 GB memory module and installed a 4 GB memory module.