What Are PCI Slots? How many hard drives can I install?

[AlwaysWinter]

First question:

What are PCI slots and can I plug extra hard drives in them?

Second question:

What is the max hard drives can I install in my desktop computer? I was doing research last night and I saw the picture of my motherboard and only showed 2 SATA slots.

The goal is to insert two additional hard drives: I have a 1TB and 3TB. Would it be possible?

[Echo_Lake · Accepted solution]

@AlwaysWinter

Welcome to HP Forums,

This is a great place to get support, find answers and tips,
Thank you for posting your query, I'll be more than glad to help you out 🙂

I see you need help in upgrading the hard drive, on HP Pavilion Gaming Desktop 690. Don't worry as I have a few suggestions which should help you.

To get the answer to this question, To increase the performance and functionality of your system, PCI/PCIe devices such as graphics cards or audio cards can be installed in the expansion card slots. 

To go through the Product specifications of your product, please share the exact desktop product number:

Use this link to find it: http://support.hp.com/us-en/document/c03754824

(Ensure you do not share any of your personal information such as serial, phone number, email ID, etc...).

Keep me posted for further assistance.