It's a NC523 so it may heat a bit too much if you do not have a small fan on it. In fact I would say that most dual port 10GbE cards will run reasonably hot without sufficient airflow as they tend to use somewhere around 15W.Which model and at what price? I've read reports of HP NC522/NC523 overheating under load when there is not enough airflow, which in my case there wont be.