1) Get the Dual. It'll be worth it in the long-run.
2) No, you'll need a Mac-specific card. My advice is to BTO your machine with a 9600 XT for an additional $50. Not a bad deal.
3) The G5's case supports two hard drives. Industry standard Serial-ATA. You can get RAID, but it is software RAID through OS X. I wouldn't rely on it if you value your data and the performance boost isn't that great. I don't know of any Serial-ATA RAID PCI cards for the Mac... yet.
4) Yes and no. Macs are a lot pickier about RAM than your average PC, and rightly so. You'll be fine with name brand RAM like Crucial, Viking or Kingston. You're rolling dice with generic RAM. Proceed at your own risk.
5) Probably not, but it will probably ship with a Software Upgrade coupon good for getting Tiger on the cheap, $10 I believe. Though, I'm not really sure of this. Call Apple for a definitive answer.
2) No, you'll need a Mac-specific card. My advice is to BTO your machine with a 9600 XT for an additional $50. Not a bad deal.
3) The G5's case supports two hard drives. Industry standard Serial-ATA. You can get RAID, but it is software RAID through OS X. I wouldn't rely on it if you value your data and the performance boost isn't that great. I don't know of any Serial-ATA RAID PCI cards for the Mac... yet.
4) Yes and no. Macs are a lot pickier about RAM than your average PC, and rightly so. You'll be fine with name brand RAM like Crucial, Viking or Kingston. You're rolling dice with generic RAM. Proceed at your own risk.
5) Probably not, but it will probably ship with a Software Upgrade coupon good for getting Tiger on the cheap, $10 I believe. Though, I'm not really sure of this. Call Apple for a definitive answer.