This is a lot more than you need to run the Sims 3 and the Sims 4.
If money is not a problem for you and you would like a decent laptop this is a good choice. However, if you are like me and would rather not spend unnecessary money, I would consider something less.
The Sims 4 is very well optimized and can run flawlessly on even the worst computers. The sims 3 a little less so, especially if you are into legacies (where the cache starts getting full after a few generations), or games with a lot of CC and mods.
Because of this, the games need a good CPU and RAM to be able to run smoothly. I previously played both games on my mid-2011 computer (i5-2400S and GTX 525M and 6GB RAM). Basically a lot worse than the computer you linked in both the graphics department and the CPU department. The Sims 4 ran without a hitch. The Sims 3's graphics were great but the game would hang because of the CPU... And again this is while running a lot of EPs. So because of this if you are looking to save money I suggest a computer with a lesser GPU, provided you are not looking at playing MORE graphically intensive games.
Quite honestly most of the computers that are manufactured nowadays DO have the GTX940 that the computer you linked has. But you can certainly find the same specs for much cheaper....
After searching on Best Buy...
http://www.bestbuy.com/site/dell-inspiron-7559-laptop-intel-core-i7-8gb-memory-1tb-8gb-hybrid-hard-drive-black/4890400.p?id=bb4890400&skuId=4890400This one actually has a BETTER graphics card and the same processor. A little less memory but unless if you want to run 30 tabs of your internet browser, photoshop, and the sims all at once, you do not need 12GB. It has a bigger screen however. $850 on Best Buy right now... there are a good amount of comparable models that have the same specs but look a bit different in this price range if it's too "gamery" for you. Haha.
Or if money is not a problem, or you are looking for a more compact model, go ahead and buy the one you linked.