How come I have DUAL Channel Memory?

[Berryracer]

I always thought that in order to have DUAL CHANNEL memory you need to install RAM Chips in identical pairs

as in, have slot 1 = 8 GB 1600 Mhz. RAM
slot 2 = 8 GB 1600 Mhz. RAM
slot 3 = 8 GB 1600 Mhz. RAM
slot 4 = 8 GB 1600 Mhz. RAM

I recently got an ASUS G750JX with 24 GB DDR3 1600 Mhz. RAM and there is one out of the 4 SODIMM slots empty

So I was thinking I definitely must be running on single channel since one slot is empty thus defying the above theory of having RAM chips installed in pairs

to my surprise, upon opening Speccy, it reports that the RAM is running in Dual Channel mode?!

How come? can someone explain please?

Note: with my previous G75VW which had 16GB 1600 Mhz. RAM running in Dual Channel mode I used to get 7.8 in the WEI index score for memory but now with my current laptop I get 7.9

 

[WildW]

Intel have had "Flex" memory mode for some time. I think you essentially get dual channel for the memory that is "paired" and single channel for the bits left over.

http://www.intel.com/support/motherboards/desktop/sb/cs-011965.htm#flex

 

[Berryracer]

I went to the Computer Plaza here in Dubai to purchase another 8 GB Stick of 1600 Hz. RAM but all they have are the older 1.5V RAM I need 1.28 - 1.35V RAM to work properly with Haswell otherwise the higher voltage older RAM will cause more heat and instability for the new Haswell CPUs

Guess I have to wait for a while until 1.35 V RAM is more common here in Dubai

 

[Sheep221]

Lol dude just order the stick from ebay and have it shipped to emirates, there is no reason to wait when there are tons of them on the net

 

[Berryracer]

does ebay ship to dubai / United Arab Emirates?

 

[dave_the_nerd]

does ebay ship to dubai / United Arab Emirates?

Depends on the seller. If they offer international shipping, then yes they will.

 

[Berryracer]

thanks bro

 

[BFG10K]

...but all they have are the older 1.5V RAM I need 1.28 - 1.35V RAM to work properly with Haswell otherwise the higher voltage older RAM will cause more heat and instability for the new Haswell CPUs

Huh? Haswell's memory controller is basically the same as IB's except it supports higher frequencies better. 1.5V is well within Intel's spec and will neither cause heat or instability.

 

[Cerb]

Huh? Haswell's memory controller is basically the same as IB's except it supports higher frequencies better. 1.5V is well within Intel's spec and will neither cause heat or instability.

http://rog.asus.com/forum/showthread.php?33744-Upgraders-1.35V-memory-is-required!

 

[acrvalho]

berryracer can you tell me where did you found the G750 in dubai and how much do you pay for it? I'm looking for this model but the only one i found is G75 at camputer care for 6,9000AED
Thanks

 

[BFG10K]

http://rog.asus.com/forum/showthread.php?33744-Upgraders-1.35V-memory-is-required!

The Intel datasheet states DDR3/DDRL is fully supported, and DDR3 @ 1.5V is a JEDEC spec.

Do you have a link to a single credible review (or official Intel documentation) stating that 1.5V is not supported?

 

[Cerb]

The Intel datasheet states DDR3/DDRL is fully supported, and DDR3 @ 1.5V is a JEDEC spec.

Do you have a link to a single credible review (or official Intel documentation) stating that 1.5V is not supported?

http://www.asus.com/Notebooks_Ultrabooks/G750JX/#specifications

http://ark.intel.com/products/75116/Intel-Core-i7-4700HQ-Processor-6M-Cache-up-to-3_40-GHz

 

[BFG10K]

Oh, I just noticed we're talking about laptops, not desktops.