Nothing significant really other than lower operating voltage. But if you are a benchmark freak then well it has a lot of difference.

Increase in clock speed and lower operating voltage from 1.3V to 1.2V.

DDR4 can say like overclock DDR3 anyways. DDR4 normal clock speed is 2.4Ghz~ if i remember correctly while DDR3L is 1.6GHz~.

Not much difference unless you benchmark computer or applications that utilise RAM clock speed.

However, AMD APU (iGPU) can get significant performance increase since it shares the system RAM.

No need to try. A lot of people already do a lot of the review on RAMs.

Intel and Nvidia still >>> AMD to be honest. Sadly 

DDR3 and DDR4 boards are different, how to upgrade?

Honestly, not much difference between DDR3 and DDR4.

Except one is newer and another is older

No idea, I also wanted to know the real problem behind this delay. Never see such a big company get stuck for so long.
You can call their customer service and provide them your order number.

You ship from overseas, they need time to sort out relevant paperworks such as Sirim permit and etc one la.

Plus Customs busy with GST implementations and etc, surely will take time one.

Honestly, Customs at Port / Airport much more efficient than those who sit over the counters

My parcel from overseas also delayed

But nvm la, not in rush.

If they do their job properly, takpe la.

lol I thought those reseller then straight away order from dell manufacturer / supplier ?
perhaps I need to give a call then

*edit, just called it
the staff told me that his manager say dell got something wrong

How do you call those promo when they are the exact same price as usual....

So as the forum member said really all shipment stuck in custom
Looking forward my red 7559

clear what ? custom release the stock and dell start shipping those stock ?

Not full shipment
Wonder why custom lock the stock
Such big company also want to lock ......

Haha no idea as I won't ask
I'm just a student aka customer
This kind of things is let you guys retailer ask about it

What do u mean by around corner, waiting game is over, you know who got stock already ? You are dell insider ? Can pm me ?

review of the 7559

2-in-1 for such size is out of place especially compared to the current yoga900/ spectreX360 or hybrids
there isn't a market for it imho compared to the others

There r cheaper variants updates in Dell website. 
http://www.dell.com/my/p/xps-15-9550-lapto...en&s=dhs&~ck=mn

XPS 15-9550	i5-6300HQ Q'core, GTX960m(2GB), 15.6" FHD Infinity touch	8GB DDR4, 1TB+32GB SSHD, W10, backlit KB, 1 yrs pro AD, TB3 X 1	RM5999(GST)
XPS 15-9550	i7-6700HQ Q'core, GTX960m(2GB), 15.6" FHD Infinity touch	8GB DDR4, 1TB+32GB SSHD, W10, backlit KB, 1 yrs pro AD, TB3 X 1	RM6699(GST)

actually there are a lot before it -- Razer Blade, HP Omen, MSI Ghost series etc.
it isn't new

Do you have stock for ASUS ROG GL552VW with aluminium cover? If so,  can you PM me best price?

Been hunting for this laptop for a while but most sell the plastic cover one,  which not so good.

Thank you