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CPU and RAM overclocking questions

Last response: in Overclocking
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December 15, 2011 2:29:00 PM

So, not too long ago i overclocked my computer (homemade micro-atx chassis, i7 950, 12gb a-data 1333mhz, low profile cooler etc).
Tried some different clocks, but decided that 3.6ghz was the most i could do 24/7 on my cooler, undervolted it to 1.14 (1.2 is default). Then i moved on to the RAM, was able to overclock it to 1900-2000mhz (!) with noticable benefits, but settled for 1443mhz.
The fan at max (1900-2000rpm, freaking loud), and after an hour on this clock the temp is about 77-78, the RAM doesnt feel hot. Seems stable.

DRAM Bus Voltages: 1.62975 v (1.65 maximum recommended, 1.6 seems to be default)
CPU voltage: 1.14375 v (1.2 default)
CPU PPL voltage: 1.20575 v (lowest possible)
More here

-Is it odd to be able to overclock to 3.6ghz while decreasing the voltage to 1.14? Can it cause problems, more then maybe instability?

-Decreased "CPU PPL Voltage" to the lowest possible, bad?

-Longterm effects of increasing voltage on RAM?

-If i buy a h100 (cooler) can I expect much better temps and overclocking capabilities? (compared with my low profile cooler)

-How to know which bios-setting that gives the biggest gain? Is the only way to try alot of different settings yourself?

-Is it unusal to be able to clock my 6x2gb RAM-sticks from 1333mhz to +1900mhz? Their timings didnt seem to change.

-Core nr.4 is ALWAYS 5 degrees cooler then the rest, why? :S

Sorry for the many questions (:
a c 197 K Overclocking
December 15, 2011 2:50:39 PM

1. Not particularly. Yes, if voltages get too low, it cause problems.

2. No. Lower voltages, consistent with stable operation, are always good.

3. As long as the RAM voltage is 1.65 volts or lower, No problem. The chips are designed to work at that voltage. The problem may be the integrated memory controller in the CPU. That will be much happier at 1.50 volts, especially with the 32 nm CPU's.

4. Depends on your original cooler. If it is pretty good, you will not see much difference.

5. Trial and error. Mostly.

6. No. But it really doesn't accomplish that much. The recent Intel CPU's (I cannot speak for AMD) are relatively insensitive to memory speed and timing. Better to run it at 1333 MHz and 1.50 volts.

7. Not unusual to have small thermal differences between cores. It's just microscopic (electron microscopic :) ) difference in components.
December 15, 2011 3:05:27 PM

jsc said:
3. As long as the RAM voltage is 1.65 volts or lower, No problem. The chips are designed to work at that voltage. The problem may be the integrated memory controller in the CPU. That will be much happier at 1.50 volts, especially with the 32 nm CPU's.

Can it cause problems in the long run?

jsc said:

4. Depends on your original cooler. If it is pretty good, you will not see much difference.

Exactly and my current cooler is a small low-profile one, so the benefits with the high performance h100 should/might be big?

jsc said:

7. Not unusual to have small thermal differences between cores. It's just microscopic (electron microscopic :) ) difference in components.

Ye but it always is a 5c differens, if i (after 1-2hour of prime 95) look at the temps atm:
max - 79,80,79,73
min - 42,42,44,37
Current - 48,47,50,43
odd?
December 15, 2011 7:47:13 PM

Also, is it rare to be able to clock my i7 950 up to 3.6ghz and lowering the voltage (from 1.2) to 1.13-1.14v - without any instability problems?
Running Prime95 for +2hours without any problem!
!