Intel 860 - Cannot reach 3.8Ghz anymore...

Frayed_Sanity

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Apr 24, 2014
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FWIW my mate who I am buying the system off showed me for a fact that the CPU can reach 3.8ghz - hell he has had it at 4ghz.


My system is as follows:


CPU: Intel 1156 i7-860 (currently running at 3.5ghz : bclk@166 and multi@21)

CPU Cooler: ThermalTake Water 2.0 Pro

Motherboard: Gigabyte GA-P55A-UD5 with bios version F13b

Memory: Kingston HyperXBlu 1600Mhz 9-9-9-24 DDR3 Memory

Video: GTX 560Ti 1gb Video Card

PSU: Antec Earthwatts 650w PSU



I don't know if it's the memory that isn't liking the multiplier or the IMC not liking it???

I have tried setting the BCLK to 200 and the multi to 19 and it doesn't POST for 2 boot attempts, and then on the third attempt it does, but at the initial boot screen the CPU shows as only running at 2.53Ghz, and I also get a warning screen, so I press delete and go into the M.I.T Tweak settings and the multi and bclk are still where I left them at 20 and 200.

Thing is, at the moment I am running it at the 3.5Ghz setting with HT enabled (yes I have tried disabling HT when trying for 3.8Ghz but it didn't do anything), and my ram is running at 1333. I am beginning to think that my ram is probably 1333 and not 1600 rated, cos my system is really stable when running at 3.5Ghz with the ram at 1333...

I have thought about changing voltages and everything but atm they're all auto and I have switched off C.I.A.2, C1E, C3-C6, Turbo-Mode, EIST, XMP.

Also enabled BCLK and my QPI is on 32x. Mem multi at the moment is either 6 or 8 to make it run at 1333.



If you need anymore info let me know, and I will get it.
 
Solution
Not all CPUs that rolls out of the fabrication plant are the same. Not all of the 774 million transistors that exists in that CPU will be fully functional. CPU are designed so that they can be used even if there are millions of transistors that are "defective" since they are designed with several redundant pathways.

It seems your CPU could have more defective transistors than your friend's CPU. Sometimes people try to overcome that OC limitation by increasing the voltage, but too much voltage can fry your CPU or simply does nothing. I have no experience OC'ing a 1st gen Core i7 CPU, but I would say you have found your CPU's OC limit.

Also, OC'ing a CPU can degrade transistors over time.
Not all CPUs that rolls out of the fabrication plant are the same. Not all of the 774 million transistors that exists in that CPU will be fully functional. CPU are designed so that they can be used even if there are millions of transistors that are "defective" since they are designed with several redundant pathways.

It seems your CPU could have more defective transistors than your friend's CPU. Sometimes people try to overcome that OC limitation by increasing the voltage, but too much voltage can fry your CPU or simply does nothing. I have no experience OC'ing a 1st gen Core i7 CPU, but I would say you have found your CPU's OC limit.

Also, OC'ing a CPU can degrade transistors over time.
 
Solution

Frayed_Sanity

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Apr 24, 2014
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Uncore frequency is 3.6Ghz
QPI is at 6.4Ghz

I got it to boot perfectly after I manually specified the timings and voltage on the ram - 9-9-9-24 and 1.64v(no 1.65v in bios) and I am in windows 7 now as I type this.

One thing tho is my 'tRFC' setting is 88, where as on my old PC I had the same ram in it and 'tRFC' was at 36...