Pretty close.
I haven't posted full details here, because I do work in the field and these are competitors' products, so it's not entirely ethical to go around bashing them indiscriminately. Also, the company I work for has some stinkers too, so glass houses and all that (though I am trying to weed those out of our product line).
I'll just say that both power supplies came with computer cases that cost <US$30 retail. The Thermaltake one performed better than I expected and only failed spec at full load and just barely; but the Rosewill violated voltage regulation specs at 50% load and died when I put it to a full 450W. They're both pretty poorly built, with minimal EMI filtering, outdated topologies, mediocre soldering, have cheap Chinese caps, and get <75% efficiency.
So, they're pretty poor.
I just posted because the Thermaltake's +12V regulation curve reminded me of LDO regulation curves, just higher wattage. :p