Ok, um... wow. Where to begin?
OS: You'll most likely be wanting Windows 7, if you don't already have it. Windows XP is ok, but I believe XP limits RAM amount to 3GB? (Someone clarify this.) Let's just say low-end W7 will cost you $100 (I think it's $120 on actual site).
CPU: You totally need a new CPU for your old machine! I found a Intel Core2 Duo E7500 Wolfdale 2.93GHz LGA 775 65W Dual-Core Processor BX80571E7500 on newegg for $118, OR you can go with the AMD Athlon X2 which I found on newegg for ~$51. I'd personally recommend Intel, cause I've had both and I think Intel is the better processor, imo. However, the the CPU is not somewhere you want to skimp by. I'd recommend getting a decent CPU. This is the core of your system. Even if you're on a budget, this is something you need to focus your money on.
Motherboard: Depends entirely on the compatibility of both your CPU and VGA. I'll put down a $150 average for bare minimum.
RAM: Basically, 4GB is the new 2GB. It's up to you what brand you get and what-not. Either way, 4GB of RAM should run about ~$100-$120.
HDD/SSD: HDD vs. SDD is what limits most high-end computers on a WEI score. SSD is the better drive, but still expensive when you compare it to a HDD of much more storage. For HDD, I'd recommend @ least 160GB - 250GB. I mean, it really depends on the user and what you are doing. For FFXIV, you only need like 50GB drive (15GB for FFXIV, 6GB+ for your My Documents for FFXIV, OS space, and random other shit). I'm a big fan of WD. You can get a 160GB WD for like $50 or cheaper. SSD would be much more expensive in this area, and since you're on a budget, probably not something you'd be needing.
Graphics Card: Totally need an upgrade for the old PC as well. I found this Nvidia card on newegg... EVGA 015-P3-N969-LR GeForce 9600 GSO 1.5GB 192-bit DDR2 PCI Express 2.0 x16 HDCP Ready Video Card for $65. The ATI Radeon HD (needs to be at least 2900 series w/ VRAM 512 MB or more) ranged a lot. However, the graphics, like the CPU, is not somewhere you want to skimp by. I'd recommend getting a decent graphics card. This is the core for running games. Even if you're on a budget, this is something you need to focus your money on.
DirectX/Sound: Both your sound and your video card need to be able to support DirectX 9.0c or higher. This is another thing to take into consideration when purchasing a sound and video card. Sound cards run pretty cheap if you're not looking for "blow me away" surround sound. I'll just put $40 here.
Screen: FFXIV requires you be able to run the game in 1280x720 or higher w/ 32-bit or higher. Again, monitor prices range GREATLY depending on what you're looking for. Size, resolution, response rate, etc. This is honestly just user preference, but I mention it because it is important.
Mouse/Keyboard/etc: Eh, not really much to say here. You can get a cheapy mouse/keyboard combo for ~$20, even less if you really feel like roughing it.
CD/DVD Drive: No brainer here really. Cheapy will cost ~$20.
To come to a conclusion:
Built PC:
OS = $100
CPU = $50 - $120
Motherboard = Varies (I'll put $150 as an average.)
RAM = $100 - $120
HDD = $50
Graphics card = $65 - ??? (I'd really recommend going beyond the minimum required.)
Sound card = $40
Screen = $120+ (For a really, um... budget friendly screen, found on newegg $120).
Mouse/Keyboard = $20
CD/DVD Drive = $20
*Total = $715+
*Note: This price does NOT include: Cables, Computer Cases, Fans/Heatsinks, Input Devices, Speakers, etc.
I'm sure others would argue with me and say you could build one for cheaper, which I'm sure you can if you REALLY looked around. All of this information is for running @ bare minimum for FFXIV specs or slightly above. Follow the same guidelines for upgrading your older PC. Just upgrade what's needed.
Just to note, SE purposely made this a graphic/CPU intensive game. I don't think they want people years from now going "PS3 Limitations" or "Wow these graphics suck". Honestly, for most general gamers, it will be wise to just get a PS3, unless you're really dieing for a new PC. Just be ready to shell out some money, or bite the bullet.
XI Wiki



'nough said
