Does a 64-bit OS raise CPU temps?

[RanDum72]

Made the switch from WinXP 32-bit to Vista Ultimate 64-bit on one of my rigs (E6550, 680i mobo, 2 gigs then and upgraded to 6 gigs after Vista). The CPU used to idle around 30c, never goes above 45c under load. Now, I'm seeing it go up to around 55c under load. I'm using a Coolermaster GeminiII HS with a 120mm fan. No change to the setup except for the OS and the additional RAM.

 

[error8]

I did this switch too and didn't noticed any temperature increase. Maybe your ambient temps went high, for some reason, or you have some dust on your cooler. Did you used the same thermal monitoring program to record your temps?

 

[RanDum72]

Same program, which is nvidia's program for the mobo and video card ( I have a GTX260).
Ambient temps are the same, same setting on my AC (which is like 72 deg F). Heck, I swear the exhaust air coming out the top of my Lian-Li case is hotter.

 

[aigomorla]

in short yes, from my testing.

Reason is because cores 0 and 1 become a lot more active on 64 vs. 32 bit. So in a short sense yeah, your cpu gets a little hotter under idle conditions, but load, the cpu has a maximum TDP in which it can dish.

So on load, no, but idle yes.

 

[RanDum72]

After a little observation, I observed that the idle temps ARE higher. The load temps may have gotten higher because the exhaust fan in the rear is barely spinning. After replacing it, the load temps are more in line with what it was before.