It used to idle around 40-50. It rarely went above 55, even if I ran a video on VLC-player and had iTunes, Photoshop and Chrome with a bazillion tabs + a bunch of other stuff running in the background. And I'd have the laptop on a semi-soft material (a folder or a book)
Only if I had it on my lap for an extended amount of time would it get really hot. And "really hot" was max 80 C for a very limited time because the fans kicked in (max 4000 rpm)
Right now my MBP's temps are as following:
Hard drive: 40
CPU A: 65
Heatsink A: 52
Enclosure bottom: 37
Northbridge 1: 49
I'm running Chrome, iTunes and Photoshop and VLC Player idles in the background. Fans are at 2800 rpm which is appr. 800 rpm higher than what it used to before the upgrade, even with the same activity.
I just tried running VLC Player and Photoshop at the same time and the fan quickly spiked to nearly 5000 rpm. It's NEVER been that high before and I've had Photoshop, VLC Player, Chrome and iTunes running at the same time plenty of times before! The temp was 77 for CPU A and around 60 for most of the others.
Room temperature is around 22 I'd guess.
Even if the temperatures aren't that much higher it still makes a difference to the aluminium frame on my MBP. It easily gets very warm now which is a bit bothersome.
What causes it to become so warm? Do I need to swap my hard drive or my RAM back to the stock ones to get my MBP cooler or is there another solution?
> Increased computer temperature - what causes it?
Answer: more heat.
Given that you've just replaced two components, the extra heat is either being caused by them or potentially you (or the installer) may have affected the airflow through the system while installing them.
I'd remove the extra RAM to see what happens (because it's the simplest to remove and reinstall), and while you're doing it check the air passages. If the temperature goes down without it, then the extra RAM must be to blame (assuming you didn't find a problem with the airflow). If the temperature doesn't go down then the hard drive must be to blame.
I'm not familiar with Mac laptops, but another thing to check for is if there's some sort of heat sink that's supposed to be attached to the drive to better dissipate its heat.
The higher (8 GBs from 4 GBs) RAM is capable of processing more stuff and faster. As a result, the HDD is also working harder. This results in more heat ---> higher temps (everything else being the same).
60 degs C is acceptable for a laptop doing a lot of computations, or CPU intensive work.