Just so you know, the idle temp of 53C was with C1E enabled, but EIST disabled. The two don't seem to tango with my motherboard, I end up stuck with a 6x multi. So I would be running at 1800MHz and 1.130V as reported by CPU-Z. I can't manually lower my vcore below VID. Right now I'm idling at 48C as it's a little cooler today. I haven't used the RealTemp calibration because at least for a Tj Max of 90C I don't think the adjustment ranges are quite large enough hehe. With a 70C Tj Max it would be 2-3C above ambient.
If my E6600 isn't TjMax 90C then it must be nearly one-of-a-kind because most people's temps seem to fall into typical ranges, whereas mine is always higher. Heck, on a day where the ambient temp in my room would have been around 15C (which is uncommon here), my CPU was still idling supposedly at 32C. Perhaps the early batches had a different Tj Max even though they were the same stepping? This is only a week 28 chip.
Funny you should mention this, I was going to suggest this in my previous post but decided you probably had better things to do
EDIT: I don't know a whole lot about how this works, but C1E seems to have a fit when you change the power level. With an MSR 0x19A value of 0x16 or 0x14 the CPU alternates a 6/9x multiplier as well as the vcore very frequently even when I'm not doing anything. At 0x12 it is almost consistently running the higher settings and therefore the idle temp difference between 0x12 and 0x16 is no more than 1C. Is it because the maximum power level is so low that C1E "thinks" it is running a high load when usage is around 3% at the most? Task manager would confirm this, because if I set core #1 to 0x12 and core #0 to 0x02 then even a small load appears greater on the graph for core #1. If both are set to 0x12 then moving the task manager window appears to cause 50% utilisation on each core, whereas it is normally around 4%. If you look below, both cores show the same basic graph, but core #1 is much more pronounced.
I'm just trying to work out exactly what is happening when you change the power level.







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