Aftermarket cooler yes or no.

I have a Phenom 955 (90w) CPU. It came with a cheap aluminium cooler (it seems that the 125w version of the CPU comes with a better stock cooler with heatpipes.)

My temperatures are about 45 degrees idle (or 37-38 degrees with cool n quiet turned on and the CPU underclocked.)

The temperature never really goes past 50 degrees,

The stock cooler seems like a bit of a joke that it came with a phenom, but perhaps it being 90w it doesn't really need such a great cooler.

I have no intention to overclock. That being the case and the temperatures I just mentioned, do you think it would be a waste of money investing in an aftermarket cooler? Perhaps I could get the CPU down 5 degrees or so, but perhaps it isn't necessary.

I have a Phenom 955 (90w) CPU. It came with a cheap aluminium cooler (it seems that the 125w version of the CPU comes with a better stock cooler with heatpipes.)

My temperatures are about 45 degrees idle (or 37-38 degrees with cool n quiet turned on and the CPU underclocked.)

The temperature never really goes past 50 degrees,

The stock cooler seems like a bit of a joke that it came with a phenom, but perhaps it being 90w it doesn't really need such a great cooler.

I have no intention to overclock. That being the case and the temperatures I just mentioned, do you think it would be a waste of money investing in an aftermarket cooler? Perhaps I could get the CPU down 5 degrees or so, but perhaps it isn't necessary.

I have a Phenom 955 (90w) CPU. It came with a cheap aluminium cooler (it seems that the 125w version of the CPU comes with a better stock cooler with heatpipes.)

My temperatures are about 45 degrees idle (or 37-38 degrees with cool n quiet turned on and the CPU underclocked.)

The temperature never really goes past 50 degrees,

The stock cooler seems like a bit of a joke that it came with a phenom, but perhaps it being 90w it doesn't really need such a great cooler.

I have no intention to overclock. That being the case and the temperatures I just mentioned, do you think it would be a waste of money investing in an aftermarket cooler? Perhaps I could get the CPU down 5 degrees or so, but perhaps it isn't necessary.

Prety much all modern day CPUs come with coolers designed to sufficiently cool the CPU under heavy load at stock clock speeds.

So since you're not overclocking, I'm pretty confident that that cooler will be perfectly fine for you as long as your case is properly ventilated.

you're missing out not overclocking the 955, get a £15 cooler like AC freezer 7 or hyper 212+ and you can OC to 4Ghz... bingo bango

btw what website is that where you can compare your pc against others?

While your stock cooler should be fine if you are not overclocking, it can never hurt to upgrade in order to keep temps down even further.