If it's PCI it is easy to tell because the "card" that has your audio jacks on it, will be plugged into one of the white connectors on the motherboard. Also, on the back of your case, the audio jacks will be on a horizonal, metal bar half way down your case or more.
The onboard sound is easy to tell because the jacks are usually vertical, sometimes horizonal, but much higher up on the back of the case. Next to the parallel port, serial port, keyboard/mouse etc...
Again, if you find it to be onboard sound card, look up your motherboard. Your everest and/or aida32 should tell you what your motherboard model is. Then try to find the drive by the manufacturer's web site.
If it is really a PCI card, you may have to pull it out and look on the card itself for model numbers or chip numbers. Although you know it is 7012, it may help to find.