Dell xps 8700- World of Warcraft

Buy it without a video card and add your own, probably a GTX660 or higher. It's much less expensive.

Yes you should have no problems. It has enough video ram to run it on ultra with no problems, and the 4770 comes with a apu like graphics enhancement. You would have no problems.

Installing a video card, especially on a Dell unit like that, is one of the most simple things to do to a computer. It's only slightly harder than putting in memory.

The biggest thing would be to make sure you touch a grounded piece of metal every few minutes and not doing anything that might generate static. Bare feet, if possible, or no carpedt. (shoes and socks generate static on carpet.) Use a clean, flat, hard surface with a nearby ground. I like to use my kitchen counter next to the sink, with the sink off, of course. A stainless steel kitchen sink is a great ground. (Many stainless steel looking faucets are not good grounds, they are actually mostly plastic with stainless steel accents that aren't connected to a ground. They are horrible as a ground.) A garage workbench is also a great place, if you have something around that you can use as a ground to disperse static, like a table power tool or grinder. Just make sure it's clear of any debris, especially metal shavings. Also, a good, clear desk with another computer nearby, plugged in but not turned on, works well. Also, if you're sitting on a chair on carpet, or a cloth chair in cotton pants, every time you move your feet, the chair, or your butt, touch the ground to disperse static. Any of those actions can generate enough static to kill a motherboard. There are grounding straps available from most hardware or computer part stores that run a few bucks that can be used to keep you grounded continuously.

http://www.amazon.com/Rosewill-Premium-Anti-Static-Wrist-RTK-001/dp/B004N91PJO/ref=sr_1_7?ie=UTF8&qid=1380899520&sr=8-7&keywords=antistatic+strap

Heck, if you have a good grounding strap and a good ground, you can even do this using your bed for a workspace and not worry about static.

as far as installing it use these steps:
1. ground yourself
2. Open the computer case
3. Take the video card out of the packaging, remove it from the antistatic bag so you can see it, and lay it nearby on a static isolated area (a flat, cleared are of a desk is fine) cooler side down.
4. identify the PCIe x16 connector on the card. Whenever you pick up the card, be careful to not touch that connector. your fingers have a little oil on them that could interfere with a good connection.
5. look inside the computer and identify the PCIe x16 slot (on the XPS 8700, there is only one, and it will be the only slot where the video card will fit) Also, identify any video card power connectors from the power supply. They will be 2X3 pin connectors with (likely) yellow and black wires and a latch on one side, not plugged into anything. With a Dell, the connector may even have a black rubber boot over it.
6. remove the backplate covers for the slot where the video card will fit and the next one down. (most video cards use two slots these days, one for venting heat our the back. If you happen to get one that uses only one slot, only take out the cover for the slot you will be using.)
7. Line up the card with the slot and insert it. it may take a little effort to insert, but not a lot. Be careful to not push too hard.
8. connect power to the card.
9. hook up the computer and test.
10. download drivers from the video card manufacturer and install (Don't use the CD that comes with the video card. Those drivers are typically out of date before they're even boxed. Sometimes, on very newly released video cards, the included CD may be the only way to get drivers that support the card. The way to avoid this is never buy a video card that has been released within the previous month.)

Common problems:
no video, but computer acts like it is booting. - The video output may be set to the integrated video in the bios. move the monitor connector to the integrated video output and test. then enter the bios and change the setting do it uses the discrete video card (possibly labeled as "PCIe slot" or something similar) and reboot with the monitor output back on the video card. - Also, it could be that you hooked the monitor to the integrated connector instead of the discrete video card. (I've done that once or twice in an air-headed moment.)

system does not boot, continuous beeping comes from the computer - make sure power is connected to the video card - make sure the card is fully seated in the slot.

Smoke emits from the system (very, very rare, but it does happen) - unplug the system immediately, call Dell support. Tell them the system emitted smoke, but do not tell them you installed a video card. This can sometimes happen with a badly manufactured motherboard. if you install a video card without physcially breaking anything and it does this, 99.9999% of the time it is a bad motherboard. Warranty should cover this on the system. Also, contact the reseller of the video card for an RMA. The video card may be damaged by a bad motherboard and will need to be swapped as well. Just don't tell the video card reseller that you saw smoke. Just tell them you installed it and got no video from it. It's a risk, yes, but it very rarely happens, and it is worth the chance for much better hardware than what the prebuilt boxes offer.