Hi guys,
I have Acer Aspire 5745G (i7-740QM and Nvidia GeForce GT420M) which recently started to run quite hot: 60C idle and 90C+ load CPU (forgot to record GPU). I measure temps with HWMonitor64.
The area of the keyboard that is located on top of the heatsink was getting really hot and it was spitting hot air from the fan vent on a side.
So, being a techie, I purchased a brand new thermal assembly with fan from ebay for $40. I know a lot of people just take the fan out, clean it up and reapply thermal paste. For $40 I thought, might as well put a brand new everything.
http://www.ebay.com/itm/Acer-Aspire-5745-DG-5745G-5745P-G-5745Z-Heatsink-Cooling-Fan-F96U-DFS531005MC0T-/112528556367?hash=item1a3339814f:g:xoUAAOSwLcNZVU1O
The thermal assembly already came with thermal paste preapplied which was nice. I successfully replaced it and the laptop was good for a day or so.
Idle CPU was at 45C and 70C at load. By load I mean 30%ish load of regular tasks.
After running Windows 10 update, the laptop progressively became hotter, again, peaking at 84C and CPU load was at measly MAYBE 40%!
In fact, while Windows 10 update was applying after restart the machine just shut off. I can only assume it was because it reached thermal threshold, but I am not sure.
So, I took the laptop apart AGAIN, stripped the prepasted thermal paste and applied a nice Silver Arctic 5 thermal paste that I use on my desktops. Put it back together. It now idles at high 40C but still gets quite hot at minimal load (30%) which go over 70C and GPU peaks at 60C. And I am not playing games, just normal tasks like browsing the web, copying backup data, etc.
So, I know I have a brand new thermal assembly and a fan that was installed right and pushes air well which means thermal conductivity is not the problem. I have the latest BIOS installed.
I then ran Prime95 to stress test the CPU. It run ok up until mid 80C and then shutdown!
Checking Intel website, i7-740QM should have a TJunction max temperature of 100C. Yet, it went off at mid 80C.
Also, HWMonitor was reporting that the package was recieving over 50W of power when as per Intel, this PCU should be consuming max of 45W.
WHAT THE HECK?
Is the fan programming not correct and it's not aggressive enough? In which case BIOS has absolutely NO settings for it.
Has my CPU now deteriorated to the point it just runs that much hotter and eat that much more?
I honestly do not remember if that was ever the issue before since my father uses it. I am losing my mind here.
Please help!
