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DDR3 SDRAM Upgrade, what specs to look at for fastest?


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#1 Zoso

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Posted 30 June 2016 - 09:42 AM

hi all,

have a laptop that needs more RAM. it came with 2x2gb (4gb) DDR3 SDRAM 1066 MHz and is upgradable to 2x4gb (8gb)

so Im trying to learn what specs I need to look at to determine what sticks will be the fastest. is there such a spec or is it just a matter of sticking with the big name brands?

is the 1066mhz it, and that can be higher, or must i stay with 1066mhz and look elsewhere to determine the fastest option?

from loading complete OS in RAM ive noticed that one laptop with 2gb RAM actually loads images faster than another that has 4gb RAM so from that I figure i want faster RAM sticks but how to tell when shopping?

thanks

#2 cdob

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Posted 30 June 2016 - 04:03 PM

Which laptop do you use? Which chipset or CPU?

The RAM controllor limits the max speed. And the BIOS may limit too.
Insert appropiate or faster rated speed, but accesss will be limited to the RAM controller.

Most likely 1066mhz is the RAM controllor max speed at given hardware.

The RAM controllor may be compatible to a single rank or dual rank 4 GB stick.
E.g. a T400 supports two 4GB DDR3-1066 dual rank sticks.
Check the RAM controllor possiblities.

And read the relating laptop BIOS update documentations, RAM detection may be enhanced.

#3 sbaeder

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Posted 30 June 2016 - 06:50 PM

from loading complete OS in RAM ive noticed that one laptop with 2gb RAM actually loads images faster than another that has 4gb RAM so from that I figure i want faster RAM sticks but how to tell when shopping?

 

Just to add to what cdob said above...Every "system" is different - that is the CPU, ram controller (sometimes a part of the CPU), Bios/UEFI, etc.  So you need to understand the specs of the system.   Look it up on he MFG's site and see if it can handle faster ram speed.  But do NOT assume that two different systems (with different amounts of RAM) can give you any indications on how a system with 2 GB vs 4 GB will act.

 

If you are "paging" (i.e. swapping out things in RAM to the disk drive, then YES, more RAM will help.  Are you certain that will be the best "bang for the buck" on upgrades?   Check the task manager (or other performance monitoring software) to see what is the "average" amount of used RAM.  If it constantly over 70-80%, and you are doing a lot of "paging" (i.e. "hard faults per second") then YES, go for memory.

 

BUT, unless you already have an SSD, that may provide more "snap, crackle and POP" to your laptop.  And with SSD prices falling as they have, price for a reasonable 120GB SSD for about the same as 2x4GB RAM.

 

Good Luck!



#4 Zoso

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Posted 30 June 2016 - 10:04 PM

the laptop is a fujitsu lifebook A series.

here some caps from cpuz:

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8pz9yQp.jpg

UiGt8Oq.jpg

on the "timings table" it shows 610mhz as the highest so does this mean that I should look for a 1220mhz 2x4gb (8gb) DDR3 SDRAM kit? would that work and are there any other specs to consider for highest speed?

Im not sure how to determine if "Dual Rank" either, is that the channels # in one of the screencaps?



it still has the OEM BIOS, never updated so I'll see if there is a newer version available.


thanks again

#5 cdob

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Posted 01 July 2016 - 03:27 AM

the laptop is a fujitsu lifebook A series.

There are different lifebook A. Which model do you use?

A Core2Duo P8400 dosn't contains the RAM controller.
It's part of the chipset. Which chipset do you use?
 

are there any other specs to consider for highest speed?

A mobile GM45 should match a P8400 and supports DDR3 1066, not faster ones.
http://ark.intel.com...-Controller-Hub
 

Im not sure how to determine if "Dual Rank" either, is that the channels # in one of the screencaps?

Screen caps shows Dual Channel, not Dual Rank.
Most likely you need Dual Rank for a P8400.

Example:
A Lifebook A6210 is rated to max 4 GB RAM. Read: tested at manufacturer, there existed max 2 GB sticks back then.
http://support.fujit...e=Notebook PC#6

Crucial offers 4 GB max, it's based on manuacturer speciication.
http://uk.crucial.co.../lifebook-a6210

The GM45 is rated to max 8 GB RAM. There should work 8 GB at a A Lifebook A6210.
Two CT2C4G3S1067MCEU should work. This is without laptop manuacturer specification.
http://uk.crucial.co...#productDetails

#6 Zoso

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Posted 01 July 2016 - 05:17 AM

this one is 6230 model, it has intel PM45 rev.07 chipset and 82801M(ICH9-M) southbridge.

crucial seems to be a prominent brand as well as kingston, black diamond is one I havnt known about that I keep seeing, good?

what spec is related to how fast an image loads into RAM for booting an OS from RAM though? presuming there is one related to this.

edit: i think this is the one i have: http://ark.intel.com...-Controller-Hub

interestingly, this page indicates it is equipped with "Intel® Virtualization Technology for Directed I/O"

in the BIOS this option is greyed out and not selectable though, ive read about custom BIOS mods to enable this on other systems over on MDL forum so now I wonder if that would be possible on this one? I dont want to end up with a brick but this is enticing!

#7 cdob

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Posted 01 July 2016 - 03:14 PM

intel PM45 rev.07 chipset

crucial seems to be a prominent brand as well as kingston, black diamond is one I havnt known about that I keep seeing, good?

Crucial is a Micron brand. Micron is a IC RAM and RAM stick manufacturer.
Kingston let produce RAM at other factories.
I prefer hardware from a manufacturer and I rank:
manufacturer Micron and reseller Kingston. Both works fine in real life.
I don't know black diamond.

Given a old Core2Duo machine, I would choose old RAM layout.

A Sony VAIO Y Series uses a Core2Duo too.
And requieres a 2Rx8 RAM layout, this seems to be a chipset limitation.
http://www.theblog.c...s-ram-2rx8-1rx8

http://forum.corsair...ad.php?p=544894

the PM45 Intel chipset will only support modules made with 256M X 8 memory IC's


Compare historc BX chipset and 16MX8 memory IC.


http://www.newegg.co...N82E16820191523
https://www.amazon.c.../dp/B005LDLVAO/
https://www.amazon.c.../dp/B004TQGF1E/
 

what spec is related to how fast an image loads into RAM for booting an OS from RAM though?

I don't know and never tested this.

#8 Zoso

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Posted 01 July 2016 - 08:35 PM

the options are more limited than i presumed, crucial has this: http://www.crucial.c...#productDetails

kingston does not even list anything for the 6230 and only other options i find are on amazon or ebay and all those ads say it could be one of several brands so you cant be sure what you get from there.

crucial seems the best option now and when using thier part number, it is only found available from them directly and no 3rd party sellers.

thanks for all the help!

#9 Zoso_The_Internet_Tard

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Posted 02 July 2016 - 01:26 AM

I would go for Corsair (my #1 choice) or Mushkin RAM if you can get it for your model. Those brands have never done me wrong. Kingston/Crucial are decent but they can't really compare. And get dual channel sticks if your hardware can handle them. Just keep in mind that if you choose RAM whose CAS timings are too low (lower is generally better), your laptop may not boot.






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