eadgbe: Would the recommended running specs for The Witcher 2 be a good guidline for a gaming pc.?. or is there anything obvious to You guy's that i should be looking to change or improve from that list of specs?
Processor: Quad Core Intel or AMD
RAM: 3 GB Windows XP, 4 GB Windows Vista/7
Graphics: GeForce 260 1 GB or (HD4850 1 GB)
Thank You all for the help so far..
Yeah, the recommended specs are a good place to start, though there has been a lot of innovation in graphics cards recently, and the "recommended" cards are a couple of generations old already.
Intel "Sandy Bridge" quad cores have the highest performance you can get right now (and correspondingly high cost). Core i5 2400, 2500, 2500K; Core i7 2600, 2600K. Highly recommended, if your budget runs to them.
AMD "Phenom II" quad and hex cores aren't as high performing, but better value; they've been discounted heavily recently. "Athlon II" quad cores are the low end of what can be recommended; they would be even better value if it weren't for the discounts on Phenom II's.
The probable reason for the discount on Phenom II's is that AMD is about to release their next generation (unlike Intel, which (almost) never discounts older CPUs), code-named "Bulldozer". I'll discuss this more under "motherboards".
When selecting a motherboard, it's easier to select the CPU first, then select motherboards known to be compatible with it.
Motherboards for Intel "Sandy Bridge" CPUs use socket "LGA 1155"; nothing else will do. There are lots of "LGA 1156", "LGA 1366", and even a few "LGA 775" motherboards still on the market. They can't be used with the "Sandy Bridge" CPUs. Cull them immediately.
AMD, on the other hand, has used a number of mostly-compatible socket types. If you choose carefully, this makes upgrading an AMD CPU without replacing the motherboard easier.
Socket AM2 and Socket AM2+ are old-style AMD motherboards. Although many Phenom II and Athlon II CPUs will run in these motherboards, they will usually underperform. I wouldn't use one in a new design. Cull them.
Socket AM3 is the current AMD style. Almost all Phenom II's and Athlon II's will run well in these motherboards. Only the fastest and hottest Phenom II's (which draw 125 or 140 watts) require careful selection; not all Socket AM3 motherboards can handle their power draw. If your motherboard can't do so, the CPU will underperform badly. This is the cause of a lot of performance problems with rigs that have high-end Phenom II's.
But I promised you a further complication: here it is. AMD is about to introduce new CPUs requiring "Socket AM3+". These new CPUs may run in Socket AM3 motherboards, but not necessarily well. There aren't many AM3+ motherboards in the market yet. ASUS (and ASUS's child company ASRock) have the market to themselves for the moment. MSI and Gigabyte will be there soon.
If you're considering an AMD CPU, I would encourage looking closely at the current AM3+ offerings and/or waiting a month for the Bulldozer CPUs and a bigger selection of motherboards to hit the market.
Beyond CPU, socket, and compatibility issues, you choose motherboards based on features.
Chipset: This can make a big difference if you are considering running multiple graphics cards (Crossfire or SLI). The better chipsets provide adequate PCI-Express capacity for the second (or third or fourth) card. Chipsets that can only do PCI-Express x4 on the second card are fine if you're going to run only one card; if you're going to run two, you need better.
RAM slots and RAM: All the new motherboards are using DDR3. You have greater flexibility if you get a motherboard that has four RAM slots. If you get one with just two, you have to replace RAM to increase RAM. Remember, the thing about RAM is that it keeps your computer from having to read the disk frequently. You need
enough RAM; that's most important. Get at least a pair (2x2GB) of DDR3-1333 or DDR3-1600. There's no reason at current prices to try to get by with less.
Card slots: If you're going to run multiple graphics cards, you need multiple PCI-Express x16 slots. As mentioned under chipsets, you don't want the second slot to run at just x4; you want at least x8. Otherwise, you just need one PCI-Express x16 slot.
Other features: If you have peripherals you want to attach, make sure there are enough ports on the motherboard for them. If you have USB 3.0 devices, make sure the motherboard has USB 3.0 ports. If you have a camcorder, you'll probably want an IEEE-1394 (Firewire) port. If you have an antique serial or parallel printer, make sure the motherboard has a suitable port (or you can get USB port adapters for these).
The other big concerns and the ones that cause the most headaches in picking are the graphics card and the power supply. I'll leave these for now, because I've wasted too many bits already.