i3 2100 - Video stuttering. PSU issue?

[bloodiedathame]

I bought a stupidly cheap system on ebay (B75M-ITX) about a year ago, it's basically and HTPC that I keep switched on all the time that runs Plex server, Crashplan and I watch the occasional video (MotoGP) on via a browser. For the most part it is fine but I've noticed that video streaming seems to stutter about once a second, just a tiny delay or duplicate frame.

The PSU is an external block, rated at 80W. I believe the CPU requires 65W. There's an internal SSD and two external hard drives attached, and that's it.

I'm wondering if the stuttering is due to the PSU not being powerful enough, and whether it's worth putting in a mobile chip (35W) to remedy the problem. Or get a different case and an SFX PSU?

Thoughts?

 

[bloodiedathame]

VGA to my TV at 720p. Hardwired internet to the box and all my other machines/consoles/things stream fine at higher resolutions so I'm sure it's not that.

Spec is:
i3 2100 @ 3.1
Asrock B75M-ITX
4GB Geil RAM
Intel 64GB SSD
2x external M3 Samsung portable drives
K/M is an USB IR cheap piece of crap

 

[bloodiedathame]

I could probably test it with one of the two but can't use it permanently, out of inputs on my TV.

 

[bloodiedathame]

All valid points. TV is a trusty old Sony KDL40V4000. I can't remember off the top of my head if the same thing happens with Youtube but will test that.

 

[bloodiedathame]

I'm wondering if heat could be an issue, idles at about 50. Haven't seen it go over 70. I think it often runs at 65 when watching videos. There is no cooling to speak of in the case, the heatsink is a very slim frostflow IIRC, and it's in a cabinet so gets pretty toasty.