Barebones Dell

If Intel Core 2 Quad Q9550 has 95W Thermal Design Power. Can you find me the TDP rating of my Optiplex 755?
I want to upgrade the CPU and am not sure if the heatsink can handle it, as I know nothing about them. It is a very large heatsink and fan though. I was going to buy it through dell since I bought the case barebones. When I look it up I only get Shroud Assembly. Does that include the heatsink?
65W most likely. I would buy a new one as they come cheap and you’re save if you might wanna overclock the CPU later.
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