I've searched for hours for a combination eSATA and IEEE1394 firewire PCI Express card for either x1 or x16.

The only item I can find is the x4 here:
NitroAV Fusion Pro 5-port eSATA/1394b Combo PCI Express (x4) Host Adapter (http://www.firewiredirect.com/product/665)

Is it not possible to have have both types of ports in the same x1 or x16 card?

Well according to File:PCIExpress.jpg - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/File:PCIExpress.jpg) I only have a x1 and traditional 32-bit PCI slot.

I've attached a photo of my slots.

I personally wouldn't feel comfortable with a card that has both unless it was extremely high quality. Even then, I see nothing but potential issues.

I can understand if you need both but only have one slot available. Still, I wouldn't do it. I would instead buy a new PC, motherboard, etc. But I'm not you.

The card looks suspect to me, and it has way too many features for a card at that price. I've never heard of the brand, though that doesn't mean anything. I have onboard eSata, as well as two additonal eSata cards, and I am very satisfied with Adaptec. The cards have worked great in three different machines, and Adaptec updates the software, despite the cards age.

For $500 you could buy a new PC with firewire, and and for another $80 an eSata card. Just some thoughts to kick around.