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Why is my MBP running warmer on Snow Leopard?

blurb23 said:
Mine was running ~10C hotter right after I installed SL (and it's required reboot).

After rebooting again, I'm down to about ~1C warmer than Leopard.
Click to expand...

So far I've rebooted approx. 5 times and the temps are consistently in the 55-60C range. That is, on average, 10C hotter than I was under Leopard, and sometimes this is with less apps open.

My GPU temperature seems to be about 15-20C hotter, depending on what I'm doing though. Interesting...
 
For me, the CPU runs 5-10C more hotter in SL. Right now, it's at 59C. But, my GPU diode runs more cooler in SL. It's only at about 66C. In leopard, I would get it ay 75C.
 
2.33 ~ 3 gigs of ram ~ 15 inch MacBook Pro. After installing Snow Leopard I've noticed it running much warmer with the fans coming on at high speed often.

I really notice it when I'm on YouTube or watching any flash videos.

I have to turn the computer off often because the palm rests become very warm to the touch.
 
mine seems to have readjusted after a days use. It was up in the mid-70's full time after the install but today it's back down to around 50 with light to moderate use.
 
On Leopard, my MBP ran anywhere from 39C to 44C with fans at 2000RPM (give or take). Right after my install I noticed that it was running around 55C at 2000RPM, but last night and today it's always been around 40C at 2000RPM.

Right now it's 41C at 1994RPM
 
Here's some possibilities:

1. For some people, it may be spotlight indexing.

2. For the web browsing people, I wonder if the version of Flash that's in the 64-bit Safari is sucking up more CPU power. Flash is the biggest user of CPU on a lot of people's machines, and there's using at least a couple Flash graphics on any given web page. Try disabling plug-ins if you suspect this.

3. It may be a power manager issues. Try resetting the PMU or the PRAM.

4. It may be a problem with some incompatible applications, especially things that operate at the file system level or modify the underlying OS.

5. It might just be Snow Leopard bugs.
 
Mine uMBP was runing 12-15 degrees hotter with decreased battery life. I've decided to go back to Leopard for the time being
 
SL runs lot warmer in 64 bit mode. the cpu & cpu heatsink temp spikes up to 55 + degree. but when i run the system in 32 bit mode, it runs lot cooler. it sticks around 40 degress. I am running firefox 3.5 , parallels 4.0, office 2008, yahoo messenger, evernote, dropbox and netbarrier. I think we will have to wait till the application vendors update their software and apple updates to 10.6.x

Ben
 
2 days post-clean-install i find that my MBP 'stresses' more easily and is prone to hot episodes even in relatively unstressful situations. It occurs most markedly when running MS Word, Endnote, Papers and Firefox together... if i add MS Onenote (virtualised) then it gets pretty damned hot quite quickly (whereas previously this wasn't the case). Not so much of a bother during the day, but if i'm working at the nighttime the fan noise really dose grate.
 
Running slightly warmer, for some reason the left side is warmer then the right one. Can't wait for 6.1, will thin out some of the problems so they don't cancel out the improvements.
 
I'll chime in here. My MBP is definitely running hotter on SL, to the tune of 18-25F. Blah.
The CPU usage is at a constant 12-15% with iTunes, TextMate, Skype, Adium, Firefox running.
 
Mein ran hotter too right after installing Snow Leopard, but after about 2 reboots it seems to be just as warm as it was under Leopard (45 degrees on average). I've also switched to the 64-Bit kernel - I don't know if that makes a difference.
 
dwsolberg said:
Here's some possibilities:

2. For the web browsing people, I wonder if the version of Flash that's in the 64-bit Safari is sucking up more CPU power. Flash is the biggest user of CPU on a lot of people's machines, and there's using at least a couple Flash graphics on any given web page. Try disabling plug-ins if you suspect this.
Click to expand...
Just to confirm, Flash is likely a big culprit. I was having similar issues with my Mac Pro, fans running more than usual. I ran Activity Monitor and found that flash was consistently using 10-15% processor power with Safari open. I downloaded the latest version of Flash, and it did help lower Flash's CPU usage, but it's still a problem. Using the latest version, I opened up cnn.com, and it settles between 1 and 6%. Open a couple of sites with flash and it for each site, it increases by a few percentage points.
 
for some reason my macbook pro right now is a lot hotter at idle (59-63C) than it usually is and so is my gpu (55C)

CPU usage is anywhere between 4-11%

This is the first time this has happened since my installation, usually my cpu was between 40-50C; not sure whats going on
 
Ok, here's a dumb one on my part.

I found this thread and proceeded to check my temperature settings and found my MBP running hotter since SL.

Today I happened to check my "energy saver" settings in system preferences and saw SL had switched me over to the GeForce 9600M GT discrete graphics (at least I think SL did this). Anyway, temp is ok for me since I switched back to the 9400.
 
I'm usually over 80 when playing WoW,
Should I stop, can it damage the system at all?
 
My early 2008 blackbook 2.2 was running hot at first while idle. So I did a few searches, reset my SMC and PRAM and now it's idle in the mid 40's - the coolest it has ever been.

I'd strongly advise resetting PRAM and SMC!!! It worked a treat.
 
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