|Your processor has four physical cores plus four virtual cores, courtesy of hyper-threading. Windows lists all eight of them in Device Manager as well as in Task Manager. |
The motherboard has six SATA ports on it, which is why Device manager lists a total of six ATA channels. It also has four fan speed monitors, hence the four ACPI fans.
All of this is normal. The instability is being caused by something else; most likely bad RAM. Return it while you still can.
Super PIII | Unlocked ES Tualatin @ 1.8GHz (150x12, 1.65v, 512K L2)
3GB PC2700 | 500GB | Radeon x1950Pro | Apollo Pro 266T | Win 7 Pro