Asus W90Vp-X1: videocard upgrade ability - can I replace it later to more modern

Asus W90Vp-X1: videocard upgrade ability - can I replace it later to more modern one/ones?

Are graphic card/cards in W90Vp-X1 upgradеable?
If you will go here: http://www.newegg.com/Product/Prod [...] 6834220503 then press specifications you will find Graphic Type: Dedicated Card.
But if you will go here: http://www.xoticpc.com/asus-w90vpa [...] figure=yes you will find that these HD4870's 512MB (1,024MB Total) are NOT stated as user upgradeable (but PCI-Express).

As I understand Dedicated Card may be NOT user (or even technician) upgradeable if it is soldered onto the system board and can not be physically removed by the user at a later time...so question is unclear for me.

For example: in here:
http://www.xoticpc.com/force-extre [...] figure=yes

the very similiar cards CROSSFIRE ATI HD3870 (2) 512MB (1,024MB Total) PCI-Express DDR3 DX10
described as User Upgradeable.

But graphic upgradeability is very important for me - if will I buy this W90Vp-X1, will I able to replace this HD 4870 X2 videocard/cards to more modern ones few years later for example?

I am asking this because just two laptop customizers said me that unlike the OCZ whitebook with the xfired 3870's Asus W90Vp-X1 HD 4870 X2 cards are NOT user upgradеable or even integrated.