First of all ill just give you a quick summary of what this thread is about, and a general Hardware recommendations you are going to need for Cataclysm. I will be writing about what specifications you will need for all levels of quality, from Ultra to Low, from 25man raiding to 5man dungeons, and everything inbetween. This thread will be mainly speculation, and is definately subject to change, but on the most post, i would say that its fairly accurate.
As you probably know, there are going to be a number of graphical updates come cataclysm, such as the new water effects, the god rays, and lots of texture and 3d modelling upgrades. Basically, if you can play with your video settings on Ultra on wow now, it doesnt mean that your going to be able to with Cataclysm, some, however, will. So ill now write about what kind of system specifications you will need for cataclysm. Id also like to point out before i start, that my recommendations for quality will be Intel based, but i will also mention AMD and why it may be a good choice of upgrade for you.
Note: I will not be posting Motherboard recommendations, as they are a little more technical, but its vital to make sure you purchase one that is compatable with the rest of your kit.
To play Cataclysm on Ultra
Pros: Play cataclysm on ultra, as with a lot of other games.
Cons: Expensive, will need to replace every 2 years or so to keep up to date to play ultra.
Recommendations
Intel Core i7 860 Processor (CPU): http://www.ebuyer.com/product/199115
Kingston 4GB (2x2GB) DDR3 RAM: http://www.ebuyer.com/product/169240
Asus HD 5850 DX11 Graphics Card (GPU): http://www.ebuyer.com/product/205834
Samsung HD103SJ Hardrive: http://www.ebuyer.com/product/173804
OCZ GameXStream 850W Power Supply (PSU): http://www.ebuyer.com/product/124736
Cooling Fan: http://www.ebuyer.com/product/231463
Operating System: Windows 7 -64 Bit Home Premium: http://www.ebuyer.com/product/173791
Reasoning: World of Warcraft is a heavily CPU dependant game, and because of that, the i7 860 processor is brilliant for the game. A good CPU is Vital for playing on ultra in Cataclysm, and even in wow at the moment. At the moment, and in the near future, there are virtually no programs that will use over 3gb of RAM, wow is included in that. Windows XP can only use 2gb of RAM, anything over that is wasted, Windows vista -32 bit can only use 3gb of RAM, and the rest is wasted. However, with windows 7 -64bit, you can make use of much more than 4gb of RAM. Having 4gb of RAM will make multitasking much more efficient, so you will be able to have Firefox open in the background, or video recording software. The ASUS HD 5850 graphics card is not entirely essential, but its definately worth a punt. Although wow is a CPU Dependant game, is does have various features that depend on your GPU, such the new water effects, and the character shadows. The water effects are enhanced tenfold with use of this DX11 graphics card, compared to say a DX10 card. The character shadows, in general kill systems, and not many computers can handle ultra including shadows, but that should be no problem for the GPU in question. With all this brilliant technology to make you a super-system, there also needs to be a good Power Supply. The better your PSU is, the more raw power you can deliver to your components, which is why with any good system, an equally good PSU is vital, and this 850W supply will do fine. For all this power in your system, you also need cooling, Although water coolers are a great choice, they are also expensive, and in previous experience, fans work just as well (fans, plural). The hardrive is also very good for this type of system, with a speed of 7200RPM its ideal, and its always nice to have plenty of room (1TB). For this build you are expected to be able to handle the outdoor environments with high FPS, and also manage 60 fps in 25man raids come Cataclysm.
Id also like to point that the Phenom II (quad) processor, is also a good choice for this build.
Estimated price: Over £1000 (Over $1500) (Over 1200 euros)
To play Cataclysm on Medium/High
Pros: Play Cataclysm with comfortable settings, easy on the eyes, with a more reasonable price.
Cons: Wont be able to play on Ultra, and isnt really future proof, will need upgrading again for the next expansion to play the same settings.
Recommendations
Intel i5 760 Processor (CPU): http://www.ebuyer.com/product/229999
Corsair 4GB (2x2GB) DDR3 RAM: http://www.ebuyer.com/product/178943
MSI HD 5670 1GB Graphics Card DX11 (GPU): http://www.ebuyer.com/product/192856
Samsung HD103SJ Hardrive: http://www.ebuyer.com/product/173804
Antec EarthWatts 650W Power Supply (PSU): http://www.ebuyer.com/product/141006
Cooling Fan: http://www.ebuyer.com/product/231463
Operating System: Windows 7 -64 Bit Home Premium: http://www.ebuyer.com/product/173791
Reasoning: This system is still a very powerful system, and will definately perform well for the price. The i5 760 processor will provide brilliant speed and will run wow a treat, you will be able to stroll through the game, with reasonabley high FPS and the game will look very nice. This processor isnt what i would call future proof, but it is definately good for a couple of years for high graphical performance. Now, there is the same quantity of RAM in this build as the previous, and the main reason for that is, ram is a nice performance booster, and its really cheap. This only difference in the ram between this build and the ultra build is the speed, theres a slightly slower speed ram in this build. You will still be able to have firefox open in the background, and some video recording software, but the video software will cause some sort of performance loss (FPS). Windows 7 -64 bit as the ultra build, just because it can take full advantage of your RAM, and will make multitasking easier. The GPU in this build is not as good as the one in the ultra build, but its cheaper, and its still a brilliant graphics card in its entirety, you should expect miracles from it, but its a safe pair of hands so to speak. This is a dx11 enabled card, which means effects like water will look better, however, in terms of character shadows, you will more than likely have to have them knocked down a notch or two from maximum to maintain a nice performance. As with good hardware, requires a good power supply, like the first build, but this hardware is not as power hungry, and so the 650W power supply in question will do nicely for a decent price. The same cooling as the first build, because cooling is cheap, and its always a nice thing to have in your system to avoid overheating issues. With this build you should expect high graphical settings in general, with maybe view distance down a peg, and character shadows down 2-3 pegs from maximum. You should be able to raid 25man raids with a 20-40 fps range during combat, and will run generally nice in the vast majority of cenarios.
Estimated price: £500-£800 ($775-$1236) (607-971 euros)
More updates soon to come for medium-low and the minimum requirements