Mainboard: Your board is an MSI K9 Platinum? If so, it has a nForce 570 chipset which is supported.

Graphics card: It is supported, I have an X1600 Pro which is the same as the X1650.

RAM: How many have you installed, 1 GB? It's enough, 2GB are better and neccessary if you want to run a virtual Windows.

Harddisk: There are no real known problems. I'm always booting from IDE and using SATA as data HDs. I would recommend a seperate HD for OS X. You can take a look at my guide how to create a safe system which allows to recover a partition. This comes handy for beginners which aren't so experienced with patching.

DVD-RW: S-ATA DVD writers could be problematic. Better use IDE.

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2 Opteron systems: OSx86 10.5.8, Andy's 9.8.0 kernel, Asus A8N-SLI Premium, Opteron 185 o'clocked @ 2 x 2,95 GHz (2nd system 2.6 GHz), ATI Radeon HD2600XT 256MB Dual-Monitor 2x HP L2035, 4 GB RAM, Griffin FireWave as main audio device, Marvell + nForce LAN, Asus U3S6 USB3/SATA6 card, 5,5 TB harddisk, Firewire 800 card, Apple Remote + eHome IR receiver, 2x Wacom serial graphics tablet, Canon Pixma iP4700, Logitech Internet Navigator wireless keyboard/mouse combination.

My Audio stuff: M-Audio Transit USB (default audio), M-Audio ProFire 610, M-Audio ProFire Lightbridge (34 channels) using Creamware A16 ADAT converter • MIDI: M-Audio Midiman 4x MIDI interface • Behringer Audio Mixers: Xenyx 1002, Xenyx 1002FX, Xenyx 1202FX, Eurorack UB1002FX, Eurorack MX1804FX, Eurorack MX262A • FX devices: Lexicon MPX100 DSP, Behringer DSP-1000 Virtualizer, Behringer MiniFEX 800 DSP, Behringer Multicom Pro MDX4400 compressor • RETRO: MSSIAH midi/sequencer/synthesizer cardridge for the C64 (Dual-SID), Steinberg M.S.I. MIDI Interface for C64