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

[devil_mcry]

uhm I just try a new setting for my system !

I think that it's very good because all voltages are relay low

i7 860 3906mhz 21x186mhz @ 1.264v (under llc, 1.248v in idle)
ram @ 1860mhz 7 8 7 24 1t 85 1.632v
pci-e 102
vtt 1.26v
vpll 1.80 vpch 1.05 other on normal



20loop all ram (3400mb) passed with 50.8gigaflops and fast session of prime95... good

ho do u think about it ?

[Martin.v.r]

fun test whit I7 860 CPU-Z on watercooling,whit all core.

[Kain665]

Isn't it just the turbo multi on core 1?

[silverfox]

just got mine watercooling running



this temps with folding@home running

i've tried 4.2ghz stable, whitout sucess...

hit 1.4vcore and still blue screen @ prime95

any hints to try?

[devil_mcry]

after 4ghz more cpu need a lot of volts to run stable

i think that with 1.4v you will not stable even at 4100

under prime95, what is your temp?

[silverfox]

[devil_mcry]

nice temp man

what settings do u use for 4.2?

[Kain665]

If you're disabling HT already, there isn't much you can do. I recommend using the Gigabyte tweaker, run Prime95 smallFFT, and adjust the BCLK up 1-2 notches while testing until you get errors. Then either bump the voltage, or back down. These chips tend to hit a wall at some point.

[silverfox]

devil_mcry,

i'm trying with vcore 1.4v.. other settings all default

Kain665,

HT ON.... i'll try setting the bclk like u said

thanks

[Kain665]

Ouch, can you post a complete template of your bios? If you keep everything on auto, motherboard tends to set way too high voltages for it...

[devil_mcry]

devil_mcry,

i'm trying with vcore 1.4v.. other settings all default

Kain665,

HT ON.... i'll try setting the bclk like u said

thanks

it's not good use AUTO value for other settings of bios...

however if u want try 4.1-4.2ghz, first step is set 21x cpu_ratio

in this way u can relax the bclk, it's more easy


with 21x if u want can try

vtt (imc voltage or qpi voltage) 1.35v
vpll 1.80-1.82v
vpch 1.05v
vdimm 1.65v (u can read on stick your value)
command rate 1t and pci-e 101

with 191mhz and 21x you are @ 4ghz
with 196mhz you are over 4.1ghz

[silverfox]

ok.. testing with that settings now

it's normal... the core #4 always hot then others?

[Kain665]

Yes. Also, VTT will be higher or lower to some degree depending on your chip.

[devil_mcry]

ok.. testing with that settings now

it's normal... the core #4 always hot then others?

all cpus have one (ore two) core more hot

for example my core #1 is more hot off all and core #3 is most cold

update? are u stable now?

[silverfox]

still not stable @ 4.1 or4.2..

i'll stay on 4.0 for now..

[devil_mcry]

mmm 4ghz is not bad over i think that only lucky cpu can run stable
your cpu want 1.36v for 4ghz i think that over 4ghz want like 1.45v, but i don't know how much it is safety

[MikelMolto]

@silverfox
Why You dont give a little more settings, then only the VCore and tell us how You check for stability.

[silverfox]

1.45v for 4.2ghz stabe @ linx/prime

[FlanK3r]

I think, 1.4-1.45V is max safe limit for 24/7 (with good temps o.course)

[HadesHwMania]

Hi everyone. I'm totally unexpert with P55 OC's, and I'm still doubtful on the CPU i have to take...I don't know which one is better between 860 and 870....i heard that 870 has a worse IMC respect to the 860....Now, I have already mobo+ram, MSI P55A-GD65 and Corsair Dominator GT 2133MHz 9-10-9-24 Rev 7.1, what do you suggest for me? Thanks ^^

[devil_mcry]

there are not realy difference between i7 860 and 870

with 870 u can use +1x of cpu ratio and +2x of cpu ratio in standar turbo mode

but it is for extreme overclock, for 24/7 there aren't difference

only i7 875k can run @ 4ghz with lower vcore that other 2 cpu, but it's not sure... depends of your luck (there are i7 875 that requireds 1.36-1.38v for 4ghz...)

[ziggo0]

Hi everyone. I'm totally unexpert with P55 OC's, and I'm still doubtful on the CPU i have to take...I don't know which one is better between 860 and 870....i heard that 870 has a worse IMC respect to the 860....Now, I have already mobo+ram, MSI P55A-GD65 and Corsair Dominator GT 2133MHz 9-10-9-24 Rev 7.1, what do you suggest for me? Thanks ^^

If you skim this thread and search around the internet you'll see that plenty of i7 870's are hitting 4ghz+.

[HadesHwMania]

I sincerely don't care about CPU Frequency, I'm worry about memory frequencies...I would push my ram to the limit, my admin pushed the same ram to 2600MHz+, I'd know what's the rate of getting a good IMC on a i7 870..

[Kain665]

There's no difference between the three models out. 860s, 870s, and 875s are not binned to be better overclockers than others in any respect. It's a shame really. From what I've seen, ES 880s are very good if you can get your hands on them. As for IMCs, all four of the Lynnfields I've had, each one could do 2200-2300mhz easy.

[HadesHwMania]

Ok then I'll get a i7 870