Opera 12.16:
- 4G ok

Chromium 28.0:
- 4G ok
- 5.8G, 11G:
Notice: Missing mime boundary at the end of the data for file 11gib.ts in Unknown on line 0
Possible file upload attack! Here is some more debugging info:

curl 7.29:
- 5.1G, 11G: missing mime boundary at end of data
- 4g: ok
time curl -F file=@11gib.ts http://test.cyberdyne.nr/upload/upload.php

Firefox 24:
- 4G ok
- 5.1G: missing mime boundary

Firefox+Firebug activated: RAM issues