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If, under load, your temperatures are in the low 80s and there is only the odd very brief spike to 90, then this is ok. If, on the other hand, it is spending a significant amount of time in the 90 range, then you should be concerned.
If you are spending a considerable amount of time at 90 or higher, then you need to do something about this. There are two things to look at:
- The installation of your cooling solution. You may have too little or too much TIM (Thermal Interface Material, slang: paste, goop, grease, etc.), it may not cover the surface uniformly or it has separated or dried out. Alternatively, the method for ratcheting down the heatsink may be nonuniform (for example, one corner not attached or not as tight as others corners) or is too tight (causing, for example, board torque, which can also keep attachment to processor from being uniform).
- The fan speed control programming (typically managed in BIOS Setup but some board vendors provide runtime application) may be incorrect. For Desktop processors, the upper end of the processor fan speed control curve should be anchored at the processor's Control Temperature (Tcontrol), so that, at all temperatures above Tcontrol, the fan is at 100% duty cycle (full speed). Your processor's Tcontrol can be determined by reading the IA32 Temperature Target Model-Specific Register (MSR), which is at address 0x1A2. This register provides the processor's Maximum Junction Temperature (Tjmax) in bits 16-24 and a Tcontrol Offset in bits 8-15 (subtract this Tcontrol Offset from Tjmax to get your processor's Tcontrol value).
Note: Support for Tcontrol is limited to Desktop and (I believe) Server processors; in Mobile and Embedded processors, the Tcontrol Offset field will typically contain 0 (zero)).
Hope this helps,
Your previous processor had solder between the die and the heat spreader. This processor uses TIM instead - and, IMHO, it cannot dissipate its heat as fast. As a result, temperatures are higher on average and spikes can be even more so. Still, if highs stay at or below Tcontrol and there is only the odd, very short duration spikes going above that point, you will be ok.
To put this in perspective, your processor can run continuously at its Tcontrol temperature for literally years without suffering any thermals-related damage. Of course, the power circuitry on the board would fry in a few weeks if you tried to do this, so we'll never know for sure.
If you want to be absolutely positive, tell me the contents of your IA32 Temperature Target MSR (0x1A2). There are all sorts of freeware tools that can display MSR values. I use one called RWEverything, but be warned that it requires some extra configuration steps to read this particular MSR.