Hi,

my latest project runs:
1. Windows 98 SE
2. Windows XP Pro 32 bit
3. Windows 10 Home 64 bit
(BootMenu via EasyBCD 2.3)

This is my build up:
Board: GigaByte GA-870A-USB3 Rev 3.1, Socket AM3+
CPU: AMD Opteron 3280 (8 core, 65W, passively cooled) (W98SE can make use of only one core, of course)
Memory: 32GB Ram (4 x Mushkin 8GB) - (W98SE sees 1GB, XP sees 2,75GB, W10 sees 32GB) (32GB is overkill - but it's a statement, too... )
GPU 1: EVGA GeForce 7900 GTX PCIe, 512MB Ram, passively cooled via Arctic Accelero S2 Rev. 2 (W98SE uses this via VGA)
GPU 2: MSI GeForce GTX 950, 2GB Ram (XP and W10 use this via DVI-D on the same Monitor as above)
HDD1: SuperTalent SATA2 SSD 30GB (W98SE)
HDD2: Samsung SATA2 SSD 128 GB (XP)
HDD3: Crucial M500 SATA3 SSD 480GB (W10)
USB2: Onboard switched on, but does not work on W98SE, therefore a PCI AddIncard is used additionally (otherwise i had no mouse on W98SE)
USB3: Onboard (no driver for W98SE)
Sound: Soundblaster Audigy PCI (onboard sound switched off, as no driver for W98SE exists anyway)
LAN: TP-Link PCIe Gigabit (Realtek 8111B chipset) (onboard LAN switched off, to avoid the hassle with NDIS2 driver for W98SE)

Further Plans: Install Steam OS on this, if possible, and maybe Microsoft Windows Server 2016 technical preview.

Cheers,
Ragnar G.D.