How to run SSBB at full speed in 1080p when fraps is recording

[Garteal]

Quote:(I: )I-O DATA HDCR-U2.0 USB, 2.0TB (Free space: 59.7GB)
And I'm trying to record a 2-player match to the HDD (I: )

There is your problem.

You're trying to record to an external harddrive via USB 2.0, which has a slow transfer rate of 20MB/s or so.
That's too slow for recording videos at 1080p.
To record 1080p videos smoothly, your harddrive must have writespeed of atleast 100MB/s. (Might be a little higher than reality, but it's better to have a breathing space).

Try recording to your C: or D: drive. They should give a much better result.

I'd also like to point out that you can record to the same drive your OS and games are on provided that you have a fast enough harddrive. Something like a HD103SJ will do the job. A second harddrive produces better results, i.e, it's more stable and prevents the (occasional) stuttering you get with one harddrive.

You can download CrystalDiskMark to benchmark your harddrives read- and writespeeds.
Let us know the results and such if you still have problems or if the problem is solved.