Question Feasibility of using an old system for video capture ?

So I have my gaming system that can be seen in my sig but what I have questions on is setting up an old PC I have for video capture and would like opinions and thoughts on if it would suite my needs. Also I am in need of information on capture cards.

Capture System Specs:
Motherboard: Gigabyte GA-970A- DS3P
CPU: AMD FX 6120

GPU: Sapphire AMD HD 4870 (can be changed out for either a Asus AMD HD-7950 or XFX AMD HD-7970 that I have on the parts shelf now)

RAM: G. Skill Ripjaws 8GB @1600MHz
HDD: Seagate 500GB prob. sata2 <-- Can be changed out for bigger from the parts shelf.
PSU: Antec EarthWatts ('20 ancient '07-'08) 650W PSU <--- that needs to be swapped out due to age.
Case: Antec 902

This system was thrown together for the youngest kid from some spare parts that were lying around and wasn't meant to be a powerhouse or gaming machine to start with. I'm under the impression that this will be good enough for just a capture machine then edit the captures on my main gaming system.

Questions:

Q1. In your Opinion will this old system be good for capturing video 1080p - 1440p?

Q2. Would a USB capture device work well with USB3 on this system ? This will dictate if I need to get an internal card.

Q3. Questions about capture devices and how they work, I've seen some USB capture devices with just 1 HDMI input. Do these need a signal splitter from the GPU? I can't see how it wouldn't.

Q4. On capture cards that have 2x HDMI ports I assume this is a pass through for the signal in and back out to the monitor. Does this create any lag in the signal from the GPU?

Thoughts and opinions welcomed. I will not be building a newer system for this, just using what I have and buying a new PSU to handle the 7xxx series GPU out of fear of how old it is.
 

Ralston18

Titan
Moderator
What video capture software will you be using?

Most software applications provide some listing of hardware requirements in the form of "minimal", "recommended", and "best".

Overall you do not want minimal and you do want as much best as you can afford.

However, since you are building from spare parts, the "best" of what you have....

One of those "worth a try" builds to see what works and what doesn't with respect to what you have on hand and any performance requirements that the finished system must meet or exceed.

Build, test, go from there.

Just my thoughts on the matter.