Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Can you change the OS to Windows 8?
Document: Although I like Windows 8, it is not as intuitive on a non-touch screen. I also selected this model, because the 770M-SLI when it is supported will outperform the single 780M. The number are not dramatic, but if you watch performance closely, you will understand the logic. 770M in SLI will perform about 17% better than 780M (Single) and if it is 770M vs. 780M then I am at a disadvantage of -20% to the 780M.I ran the stock laptop for a couple of days and it has been a joy.
To be fair, I know that all builders are going to have issue and I am confident that I could fix the issue myself if needed, but I just did not want to have to deal with the hassle if I spent over 2K for a laptop.Last notes and then we will discuss this laptop, I went with ALW-6490sLV vs. ALW-6491sLV for two simple reasons. First, 6490 which represents Windows 7 is always at least 30-50 bucks less expensive than 6491 (Windows 8) version.
They can be quickly upgraded without much hassle. The memory, unless you specifically need it, I would only recommend going up to 24 gigs on this model. 32 gigs is fantastic and I use when using Photo Shop and VMware while simulating the functionality of 6-8 Windows servers in a domain. The process to replace the memory is two slots in the back and two slots in the front. Accessing the back is a piece of cake, while access the front requires time, attention to detail and disassembling multiple parts of the laptop.
This will not be a concern if you decide to get 6491 with Windows 8, the base Operation system will be able to see 32 gigs or less memory without an issue.My first thoughts on the laptop, it is huge and heavy and appears to be well made. I feel like I could use this to stop a bullet. The item weighs 11.9 pounds and is not something that you would want to carry every day to class or work. It is heavy, but is a desktop replacement that produces results.The keyboard area is massive and I have plenty of space, it is extremely conformable and allows me to rest my wrists while typing.
(16\24 should be plenty of memory for most individuals!) BTW, I did do a Windows Anytime Upgrade to take advantage of the extra memory added to my system. I was aware that I would have to do this for Windows 7 and since I already own the key, it was a simple process. I will only run Windows 7 Ultimate for multiple reasons and is my personal choice. But if you are going to get Windows 7, it will be needed to utilize memory over 16 gigs. Specifics: Windows Home Premium will only support 16 gigs of Memory and to utilize more, you need to upgrade.
Including the cable connections to keyboards and drives &iexcl;V this is a big negative for users who are not handy. The process added about 90 minutes to replace the top two SODIMMs. For all interested, I purchased the memory from Crucial and I have had no issues. I would only recommend going to 16 gig or 24 gigs, since that will allow you to upgrade with our headache of touching the top two memory modules. The combination would be 8 gigs on top and either 8 or 16 on the bottom.
I did upgrade the following on my system. (This is the fun part!) I went from 8 gigs of memory to 32 gigs. (For all with that concern, this system will handle up to 32 gigs. I was not able to verify prior to adding the memory and one of my concerns when making this purchase.) I also added a Samsung Solid State drive into the system. The only modification that I will make going forward will be to remove the DVD drive and install a BLU Ray drive.I recommend the following add-ons, additional HDD, be it Solid State or mechanical and BLU Ray since they are easy to reach and located at the bottom of the unit.
Samsung Series 7 Gamer NP700G7C-S01US being my last gaming laptop, and I can't tell you how many different laptops over the years.For this purchase, I looked at every conceivable configuration from Dell Alienware for ALW 17 and 18 models. I also considered the following models for purchase, MSI G Series GT70 2OD-039US, Qosmio X70-AST2GX1 and several other vendors including the top tier for building a custom laptop i.e. Sager/Xoticpc. Those were my considerations and I keep reading about manufacturing concerns and I keep thinking that I did not want to deal with these issues.
Probably my favorite of all of my laptops. I will not focus on the customization of the lights and back light keyboard, but understand that is highly customizable. (Just not the reason that I purchased the system. I will even state that I am blown away that this system has the option &iexcl;V just not a consideration when I made the purchase. )The screen is massive, it is 18.4 and one of the reasons that I went with the ALW 18. 18.4 inch (467.36 mm) WLED FHD (1080p) TrueLife TN 400 Nit Display (1920 X 1080).
Maybe that's why Dell made the speakers so loud on this thing.This laptop is HUGE but surprisingly not heavy. (At least not as heavy as I thought it was going to be). You CAN take this around school and work with the right backpack. I ordered the Alienware backpack and find that the weight is easily manageable if you really want to take this thing around. The only gripe I have with this machine is the fan noise. Look up on youtube how long this thing is. If you can live with it then buy it.
Answer: Yes.  You can upgrade via the normal process.  You can purchase Windows 8 and perform an upgrade.  What you should do, is but model ALW18-6491sLV, it is exactly the same system except that it comes with Windows 8 pre-installed. I detailed why I went with Windows 7 in my review, Windows 8 is good but runs best on a touch screen.  I hope this helps.