**Official** Core i7 860/870 overclocking thread

[irev210]

i7 860
P7P55D Pro MB
1.34Vcore

4013MHz (20x200.7)

100% stable, rock solid after 15+ hours of stability testing

[LoneReaction]

i7860
P7P55D standard edition

Vore: 1.21875v, 160x22 (3.534Ghz)
IMC: 1.35v
Dram: 1.65v, 1600, 9-9-9-24, 2N
PLL: 1.9v
PCH: 1.15v

At 30c ambient, load 75c
With aircon, load 70c

Power saving features all off.

Is there anyway I can increase the speed while maintaining same temps? It's hot where I live, and I'm already using the noctua heatsink with 2 fans. Tried reseating the heatsink. Also touched the heatsink'sfins, really warm so I guess they work!

I am trying out if increasing the PLL can help lower vcore.

[zsamz_]

i7860
P7P55D standard edition

Vore: 1.21875v, 160x22 (3.534Ghz)
IMC: 1.35v
Dram: 1.65v, 1600, 9-9-9-24, 2N
PLL: 1.9v
PCH: 1.15v

At 30c ambient, load 75c
With aircon, load 70c

Power saving features all off.

Is there anyway I can increase the speed while maintaining same temps? It's hot where I live, and I'm already using the noctua heatsink with 2 fans. Tried reseating the heatsink. Also touched the heatsink'sfins, really warm so I guess they work!

I am trying out if increasing the PLL can help lower vcore.

you better be carefull with pll voltage
mine is 100% stable 4.2 with ht but i have megahalems
4.0 is quite easy just turn ht off if your temps ae high

[LoneReaction]

I don't wanna turn off HT, because it's the only reason I got i7 over i5. (also, coming from core 2 duo, 8 'cores' is super nerdy)
I found out about pll when I increased it to 2.0v and the comp BSODed! XD

[OC Nub]

zsams is right, you can kill the chip that way. I leave PLL alone, and adjust other voltages.

[zsamz_]

I don't wanna turn off HT, because it's the only reason I got i7 over i5. (also, coming from core 2 duo, 8 'cores' is super nerdy)
I found out about pll when I increased it to 2.0v and the comp BSODed! XD

with ht on 4.0 is easy 1.38v max needed i can do 4.2ghz 1.4v ht on
even vtt over 1.4 is dangerous

[dcl]

Hey guys
i7 860 on a P55UD4P (F4t Bios) with 8gb Corsair XMS1600

It's stable (100passes Linx, 5gb problem size) at 22*160 = 3520Mhz with 1.2625Vcore and 1.15 VTT. 1mil SuperPi = 11.8s

Testing 22*180 = 3960 Mhz now at 1.275 vcore/1.19 vtt. RAM at 1440 though. Seems solid. 1mil SuperPi = 10.5s

I'm not sure but I think I need extra volts to push the RAM passed 1600, either than or more VTT for BCLK. My RAM is spec'd for 1.65 and I'm not afraid to push that further but I've read any more is dangerous for the CPU? Even the BIOS warns against using more than 1.64.

I will post pics shortly.

If my RAM is running under spec and not n being stressed should I not bother with such a large problem size? Or do larger problems better stress the CPU too?

[dcl]

I'll continue testing this setting overnight. LLC disabled, voltage jumps from around 1.264 idle to 1.296 full load. Seems stable though.
Temps feel a little bit high? Running Noctua U12P with Push/Pull. Prime95 temps peark around 10degrees lower.

[core_tracer]

nice dcl

what is ur procs batch no?

[OC Nub]

Nice oc, your temps are pretty high imo, I wouldn't run any more linx at those clocks until you get better cooling.

[dcl]

Nice oc, your temps are pretty high imo, I wouldn't run any more linx at those clocks until you get better cooling.

Hmm, Not sure how much better I can get without going w/c?

Noctua with Push Pull config. Stock temps are very good, but seem to get pretty high when overclocked.... Not even using that much voltage. At stock with the power saving features on, it idles barely above ambient.. I've seen it in the teens, usually in the 20's.

At 3520 with 1.265vcore/1.15vtt the temps peak around low 70's which I can happily live with. These are my 24/7 settings so far.

Fortunately, nothing will ever get the CPU as hot as Linx if I chose to run at these volts/clock 24/7. I might even be able to lower them too.

Not sure what batch number sorry. Don't have the box around... I should have recorded it when I installed the noctua...

[OC Nub]

Your voltage for 3.96ghz is good, I just thought the temps for that vcore were a bit high. If it were my cpu, with temps in the mid to upper 80's c I would stay away from running 50 passes linx, just to be on the safe side. Just my opinion. Still a very nice oc, looks like you got a good chip.

I have been unhappy with my cpu, couldn't bench above 4.2ghz without it freezing, tonight I changed the timings on the mem, and was able to run some vantage at 4.25ghz. I have ocz 1600 cl8 mem and it freezes up at its rated speed when overclocking the cpu, but passes linx and blend at 1528mhz cl7. I am glad to find out it is the memory and not this cpu that I have been blaming and ready to get rid of. Will try and get some better ram and maybe enjoy this rig again.

[zsamz_]

good bbse or hypers will make you happy
get a nice 3x2 set and if not happy you can always recycle

Your voltage for 3.96ghz is good, I just thought the temps for that vcore were a bit high. If it were my cpu, with temps in the mid to upper 80's c I would stay away from running 50 passes linx, just to be on the safe side. Just my opinion. Still a very nice oc, looks like you got a good chip.

I have been unhappy with my cpu, couldn't bench above 4.2ghz without it freezing, tonight I changed the timings on the mem, and was able to run some vantage at 4.35ghz. I have ocz 1600 cl8 mem and it freezes up at its rated speed when overclocking the cpu, but passes linx and blend at 1528mhz cl7. I am glad to find out it is the memory and not this cpu that I have been blaming and ready to get rid of. Will try and get some better ram and maybe enjoy this rig again.

[LoneReaction]

zsams is right, you can kill the chip that way. I leave PLL alone, and adjust other voltages.

Thanks for the warning guys, I managed to get pll down to 1.8v, by rasing vcore up a notch.
I will stick to my 3.5ghz overclock, the temps are nice and I don't even have any app that would need that much speed (except stress tests).

Now to find out how to get it stable with speedstep on...

[OC Nub]

Some vantage at 4.24ghz. I had a run at 4.35 yesterday but today cannot get it to finish the test again, today with the cards overclocked this is my best score so far. Hopefully with new ram I will be able to go higher

EDIT: here is one at 4300mhz although the score didnt change much.

[dcl]

Has anyone been toying around with the CPU Clock drive?
I believe GB and ASUS motherboards have different defaults of 700mV and 900mV respectively.

[OC Nub]

On the p45 gigabyte board's the advanced clock control made a world of difference in maximum overclocking. Hard to find any detailed info for overclocking these p55 boards. Guess we are the guinea pigs for this platform.

[dcl]

On the p45 gigabyte board's the advanced clock control made a world of difference in maximum overclocking. Hard to find any detailed info for overclocking these p55 boards. Guess we are the guinea pigs for this platform.

I just did a bit of googling. I didn't 'reload optimized defaults' after my last bios flash. It puts up the CPU clock drive to 900mV.

Retesting some o/c's now.
Not sure if I'm imagining it, but I think my idle temps are higher? We'll see.
Interestingly core3 idles higher but peaks lower than the rest of them. :s

[OC Nub]

dlc: on my 860 core0 runs about 5c higher than the others under load. I believe Unclewebb said unlike the 1336 i7's, these 1156 cpu's don't have the most accurate sensors, the first core seems to be the closest to being accurate. (Correct me if I am wrong Unclewebb)

Woke up early and took a drive to the nearest Micro Center to look for some better ram. Picked up a 2x2gb kit of Dominators. Set the timings to cl 7 and did a short linX run to test at 1900mhz. Meant to show SPD in the SS but I kind of fudged that up

[andressergio]

dlc: on my 860 core0 runs about 5c higher than the others under load. I believe Unclewebb said unlike the 1336 i7's, these 1156 cpu's don't have the most accurate sensors, the first core seems to be the closest to being accurate. (Correct me if I am wrong Unclewebb)

Woke up early and took a drive to the nearest Micro Center to look for some better ram. Picked up a 2x2gb kit of Dominators. Set the timings to cl 7 and did a short linX run to test at 1900mhz. Meant to show SPD in the SS but I kind of fudged that up

very nice mate !!! you are enjoying ya rig very much

[OC Nub]

Thanks Sergio, yes I am enjoying it again for sure.

[unclewebb]

You're right OC Nub. The Core i7-900 sensors are excellent and very consistent from one CPU to the next. The 1156 sensors seem more consumer grade and just aren't as consistent. For the majority of all Intel CPUs I've seen, core 0 is almost always the most accurate at full load. I sometimes wonder if Intel found a way to save a nickel by only calibrating the first core and then not worrying about the rest since they'll be close enough at TJMax. With Intel, who knows. Don't lose any sleep over your reported temperatures.

4 GHz is the important number and that looks good to me.

[dcl]

Any of you guys opened up Everest to check the power usage of the CPU at full load? I'm guessing the sensor aint 'that' great either.

Mine reported like 260watts at full load at 3520, surely that can't be right?

[kecap]

i7 860 : L928B178 @ 4.2Ghz [200X21] - vcore 1.4v vdim 1.65v
P7P55D Standart Edition
2X2GB OCZ Platinum Edition



sory, i have an stupid question, what i should to do..? change i7 860 into i7 920 or stay at i7 860, i still confused thanks.

[Forsaken1]

Started to play with new toy.