Core i7 Overclocking by Batch #

[seba84_2005]

My baby

[hlonipha]

My baby

6-7 minutes prime?????????????????? hardly stable....

[1MaNArmY]

LoL

[Stvwndr219]

lol as long as it gets the job done for what he needs it to do, then i guess it's "relatively stable".

[seba84_2005]

[hlonipha]

lol as long as it gets the job done for what he needs it to do, then i guess it's "relatively stable".

lol!!! then he should post a screenie of the proggy that he uses performing the task at hand!!!!
I.E.. I back up my Blu-Rays discs, so I would post a screenie of ripbot or BD- Rebuilder encoding the movie to mpeg on a second pass!! (loads up the 8 cores 100% for a few hours) lol

[PatRaceTin]

hmmm seem to be that batch "38xxxxx" is better than "39xxxxx" isn't it????

[hlonipha]

hmmm seem to be that batch "38xxxxx" is better than "39xxxxx" isn't it????

I have not played with a 39 batch yet.

[Toolius]

Batch 3845B271



Was not stable doing 4.3 @ 1.3V with HT ON but is fully stable @ 1.31v.. But have not done much fine tuning yet.
Will upload screenshot soon

[rfisher983]

Just picked up 3850A849 dated 5.4.09 Costa Rica from Microcenter for $200. Wont have other parts till Thursday

[ex2cib]

you guys are making me want to work with my chip again, not that i really worked that much with it to begin with.

[angelreaper]

Batch 3845A935

[Dahmer]

Very nice for a 3851 batch, mind telling me your voltages? (3851A262 here)

[PatRaceTin]

my batch 3852A328

quick test 20min

[saaya]

excellent thread!!!

so whats the conclusion? a>b? how about mfc location, are all i7 chips made in costa rica?
if not how do chips from diferennt fabs compare?

[saaya]

fyi, i added all numbers from your excel sheet to a graph and played around with it... for those interested:

average reported overclock is ~4ghz with ~1.4v
average voltage scaling based on reported results is 150mhz per .1v vcore

and something that didnt surprise me but maybe its news to some, lower temperatures dont mean much... you might be able to get the same overclock with less vcore if the temps are low, thats it... lower temps dont notably translate to higher clocks. notably higher clocks at the same vcore are only possible with notably lower temps in the -100C range.

improved aircooling or watercooling only allows us to run higher vcores and hence higher clocks without running into critical cpu temperatures of 80C+ and it allows us to enable HT. for normal gaming and desktop usage overclocking i7 seems to make very little sense... it makes much more sense to reduce vcore to 1v and then push for the highest clocks which will be more than fast enough and consume a lot less power and run much cooler.

[MACMAC]

excellent thread!!!

so whats the conclusion? a>b? how about mfc location, are all i7 chips made in costa rica?
if not how do chips from diferennt fabs compare?

Week seems to be more important than A/B. Week 45's are clearly the best. There are strong chips in other weeks, but it is very batch specific.

Yes, all Nehalem cores are made in Costa Rica.

[JakFrost]

I have the chip below and I'm having serious problems with BLCK being only stable at 180 at CPU 1.20V with Prime95 25.9 (x64) Blend for 11-hours+ with temperatures of 80C peak, 40C idle on RealTemp 3.0 and ambient 29C outside.

Processor: Intel Core i7 920 2.66 GHz
Revision: D0 (SLBEJ)
FPO/Batch#: 3901A238

Date of purchase: 2009-06-29
Place of Purchase: Newegg.com

When I have more time I'm going to try to see if I can get 190 to work. From my short testing today anything at BLCK 200 MHz even with CPU V 1.45 and QPI 1.45 ends in immediate freeze within 15-seconds while doing Prime95 SmallFFT test. I think that it might be my processor, memory, or something else in the equation.

(Update: I did testing and my maximum voltage is 1.250 V which hits temperature peak of 94C for my air cooling setup. At this voltage BCLK 180 is stable but 190 is not and leads to a freeze within minutes. I have settled on 3.60 GHz at BCLK 180 x Multi 20. Might test BCLK 185 for 3.70 GHz but I don't have much hope without bumping voltage up.)

I have my own overclocking thread below with the details of the problems I'm having. It might just be my inexperience with overclocking since my last attempt on AMD Opteron 175 2.2 GHz only ended with 2.5 GHz 3D game stable, and 2.75 GHz 2D prime stable.

HardOCP - Overclocking Air: Intel i7 920, Asus P6T, G.Skill DDR3-1600 C8, Xigmatek HDT-1284E

[Chicken Patty]

I have the chip below and I'm having serious problems with BLCK being only stable at 180 at CPU 1.25V with Prime95 25.9 (x64) BlendFFT for 11-hours+ with temps 85C and peak 87C on RealTemp 3.0.

When I have more time I'm going to try to see if I can get 190 to work. From my short testing today anything at BLCK 200 MHz even with CPU V 1.45 and QPI 1.45 ends in immediate freeze within 15-seconds while doing Prime95 SmallFFT test. I think that it might be my processor, memory, or something else in the equation.

Processor: Intel Core i7 920 2.66 GHz
Revision: D0 (SLBEJ)
FPO/Batch#: 3901A238

Date of purchase: 2009-06-29
Place of Purchase: Newegg.com

I have my own overclocking thread below with the details of the problems I'm having. It might just be my inexperience with overclocking since my last attempt on AMD Opteron 175 2.2 GHz only ended with 2.5 GHz 3D game stable, and 2.75 GHz 2D prime stable.

HardOCP - Overclocking Air: Intel i7 920, Asus P6T, G.Skill DDR3-1600 C8, Xigmatek HDT-1284E

Hello Jake, i'm seeing that at 180 BCLK 1.25v you are hitting almost 90ºc. I think as you add just a bit more voltage to go over 180 BCLK i think you might just be running the CPU too hot and its shutting down or causing all sorts instability. What do you say?

[roller11]

my batch 3852A328

quick test 20min

wow, continous prime95 at 4510...excellent work! Great chip you have there, maybe the later batches are as good as the earlier. thanks for sharing

[Anth Seebel]

tinker tinker..

W3520 3845A935 , -40C single stage phase cooling..

SuperPi 1M 7.969s

[Infa]

Man, i get so jelous of all Good D0 cpu's =)

i get 1.36v at 4.2 with NO HT! and about 1.48 with HT... my C0 is pure garbage against this!

[Chicken Patty]

Man, i get so jelous of all Good D0 cpu's =)

i get 1.36v at 4.2 with NO HT! and about 1.48 with HT... my C0 is pure garbage against this!

dont feel bad I have a D0 too!

[Pain|Killer]

FPO/Batch#3911A207

Looks like a bad chip. It can reach 4Ghz on vcore 1.3v

[Brad8988]