OK - good to know, thank you. I shall get hold of a suitable cooler and try it!

N00b question, potentially..

I bought a used (I know, I know) NewPac and suspect it's b0rked but just want some advice on how to confirm or otherwise. CGMiner sees it OK and it starts work, but with passive cooling it very quickly overheats (90 degrees plus after 10 minutes) even if I restrict it to 50Mhz. I'm happy to add some active cooling but I'd prefer to do some diagnostics first to make sure I'm not throwing good money after bad - so, what can I look for?

Thanks in advance.