Core i7/X58 Overclocking Thread

[liftedcj7on44s]

what thread?

http://www.xtremesystems.org/forums/...d.php?t=214441

[vikingboy]

am I mistaken or does the asus p6t-d board with 1003 BIOS only allow CPU down to 1.25v
I can run stable at that it seems and would like to try lower......

[Khalmyr]

I gave up on 4Ghz.

Currently running at 3906Mhz (186x21) with vCore @ 1.35v, PLL @ 1.8v, QPI @ 1.2v and all others at minimum.
Won't do 4Ghz stable even at 1.42v and that already makes my CPU go over 85C

raising PLL or QPI won't help me bring vCore down.

[liftedcj7on44s]

try the 19x multi. i needed 1.4 vcore at 200x20 to even get into windows. with the 19x multi i am at 211x19 and only needing 1.32

[burningrave101]

try the 19x multi. i needed 1.4 vcore at 200x20 to even get into windows. with the 19x multi i am at 211x19 and only needing 1.32

My Gigabyte EX58-Extreme won't run 211x19 for nothin. I've been testing it out since others seem to be having luck on the 19x multi but it doesn't seem to work for me. I leave the vcore set to 1.4v along with playing with all the other voltages and it locks up the second I start Prime95. It doesn't BSOD though like it usually does when I'm testing with the 20x multi due to low vcore. So I don't know if my board just isn't capable of 211 blk or maybe it could be my memory or my 920 just won't cut it. It could have a weak memory controller I suppose. I have the Corsair 1600C8 Dominators so I would think they could handle 1688Mhz. I bumped their voltage up to 1.75v and still no fly.

[Khalmyr]

try the 19x multi. i needed 1.4 vcore at 200x20 to even get into windows. with the 19x multi i am at 211x19 and only needing 1.32

Tried that too

Guess I just got a bad chip

[nemesisrobot]

Just finished 24 hours of Prime @ 3.4 GHz

20x170:
vCore - 1.225v in BIOS (1.216v Load)
QPI/VTT - 1.25v
vDimm - 1.63v

Speedstep, HT, and Turbo are all off.

Pretty happy with it, please let me know if you guys think any of the settings can be improved.

[SteveRo]

This might be the best this 965 can do with HT off - on water - I would have liked to have gotten 4.5 but as a consolation I am please with the temps. I plan to try some x23 multi's next.

[jcool]

My Gigabyte EX58-Extreme won't run 211x19 for nothin. I've been testing it out since others seem to be having luck on the 19x multi but it doesn't seem to work for me. I leave the vcore set to 1.4v along with playing with all the other voltages and it locks up the second I start Prime95. It doesn't BSOD though like it usually does when I'm testing with the 20x multi due to low vcore. So I don't know if my board just isn't capable of 211 blk or maybe it could be my memory or my 920 just won't cut it. It could have a weak memory controller I suppose. I have the Corsair 1600C8 Dominators so I would think they could handle 1688Mhz. I bumped their voltage up to 1.75v and still no fly.

How much VTT (VTT/QPI voltage in gigabyte bios) have you tried? That's the one voltage that matters for max BCLK, also maybe CPU PLL.
If prime blend freezes the VTT is too low. Depending on the CPU, amount and speed of memory and the quality of the IMC you'll need between 1,4 to 1,6V VTT to run 211x19 stable. Personally I wouldn't go past 1,5-1,55V VTT 24/7 though, at least not on air.

Stevero, nice CPU and great temps for that voltage. How much do you need for 4,4Ghz with HT?

[Lukee]

My Gigabyte EX58-Extreme won't run 211x19 for nothin. I've been testing it out since others seem to be having luck on the 19x multi but it doesn't seem to work for me. I leave the vcore set to 1.4v along with playing with all the other voltages and it locks up the second I start Prime95. It doesn't BSOD though like it usually does when I'm testing with the 20x multi due to low vcore. So I don't know if my board just isn't capable of 211 blk or maybe it could be my memory or my 920 just won't cut it. It could have a weak memory controller I suppose. I have the Corsair 1600C8 Dominators so I would think they could handle 1688Mhz. I bumped their voltage up to 1.75v and still no fly.

For testing, just lower the Memory Multi to 6x and Uncore Multi to 15x. This will allow you to eliminate that the memory could be your problem.

What qpi/vtt are you running? My chip requires a LOT to hit 211bclk. Like 1.79 which is way too much for my liking.

[Avan]

I got a line on some retail 920's from batch# 3837B317 and 3837B215. Anyone have and bench time with these yet?

edit: also 3836B043.

[dejanh]

My new result running at 4.2GHz with Uncore:QPI 1:1 3.6GHz each. Lower voltages on the core too, by about 0.032V from before using new R2E 0904 beta BIOS from Asus...all on air.

QPI/DRAM and DRAM voltages are the same as in all of my other runs, 1.35000V and 1.65681V respectively. CPU voltage is set to 1.39375V in the BIOS. C-states are on, hence the lower post-run clock visible in RealTemp.

Not bad

[vikingboy]

heres my latest 100% stable results. I can lower core voltage down slightly but am not able to run 100 pass of dual linx passes simulatneously with prime blend.
Stability is important to me and happy to run the few extra mV to accomplish this.

i920 'A' batch - not particularly kind one either, Asus p6t-D, Thermalright 120 push only Sythe fan, corsair 620HX PSU, Win Vista 64bit
6GB Corsair Dominator 1600 ram @ 7-8-7-7-20

Bios settings.
CPU 1.325v (.125v in CPUZ in windows under full system load)
QPI 1.29365v
Ram 1.66v
PLL 1.92v
IOH 1.24v
Load line calibration = off (only way to go lower than 1.3v at run time under load to drop temps)

Will try to push to 19*210 next, now Ive found the stable settings for 3.8Ghz




Edit some notes I found applicable when tuning this system, your systems may vary.
BSOD in Prime were almost always results of not enough core voltage.
Linx memory errors were almost always fixed with increase of QPI voltage
Im sure RAM volts can be dropped fairly significantly too but as not even warm, no big deal - will fine tune going forward.
Arguably, I found Stability was dependant on the ratio of QPi and vcore. To high a vcore with too low a qpi (or vice versa didnt help stability).
Too much voltage decreased stability noticeably (1.4 core + 1.35 QPI is less stable than this lower power system according to my notes)
I found I could dual run two Linx passes with 20 passes and be stable but not be 1 hour prime95 stable - a mixture of the two was a requirement.
Simultaneous testing with prime and dual Linx passes was the ultimate test. I was prime95 stable for many horus but adding Linx brought system crashing down very quickly.

I still dont see the same performance as Dejanh above with just two Linx passes with same parameters and same memory & cpu clocking. possibly something going on in the background of my lightly tuned Vista system? needs investigation....

[SteveRo]

Fudzilla just posted this - http://www.fudzilla.com/index.php?op...1407&Itemid=66
Anyone with a 965 under water tried this yet? Its on my list!

[Hooti3]

Batch number 3838A646

Anyone else got this batch?

wondering what kind of volts required for 4.0Ghz stable w/ HT

[Splave]

@viking, nice results. Ive never had prime fail within an hour after being atleast 20x linX stable that very strange

[vikingboy]

@viking, nice results. Ive never had prime fail within an hour after being atleast 20x linX stable that very strange

I think its because i was running on edge of memory voltage and my gut tells me prime hammers memory more or is more sensitive than linx.

[ReverendMaynard]

I think its because i was running on edge of memory voltage and my gut tells me prime hammers memory more or is more sensitive than linx.

if you set linx to use all available ram it creams prime for stability.

[JWMc]

if you set linx to use all available ram it creams prime for stability.

It does for finding vCore I agree. But I just passed LinX x 20 with 6 gigs with max memory used at 1.375 VTT and blue screened Prime blend after maybe 15-20 mins. I'm up to over an hour now on blend with 1.395 VTT.

http://img220.imageshack.us/my.php?i...184v1ptpc9.jpg

http://valid.canardpc.com/show_oc.php?id=485169

[ReverendMaynard]

It does for finding vCore I agree. But I just passed LinX x 20 with 6 gigs with max memory used at 1.375 VTT and blue screened Prime blend after maybe 15-20 mins. I'm up to over an hour now on blend with 1.395 VTT.

http://img220.imageshack.us/my.php?i...184v1ptpc9.jpg

http://valid.canardpc.com/show_oc.php?id=485169

then ditch prime.

[GenTarkin]

I got a line on some retail 920's from batch# 3837B317 and 3837B215. Anyone have and bench time with these yet?

edit: also 3836B043.

Im curious to see how that 3836B043 performs, because I just got that chip also. I am only using intel stock cooler for now though. Havent tried clocking it yet as my windows install is all shot to hell...yay! so, will post back with results soon as windows workin again. Try out the 3836B if ya want =) Im curious to see what people can get on high end air cooling out of these.

[dejanh]

Fudzilla just posted this - http://www.fudzilla.com/index.php?op...1407&Itemid=66
Anyone with a 965 under water tried this yet? Its on my list!

Nothing special about that article, but I'd be betting that they cherry picked the CPU at least a bit.

4.6GHz with 1.44V on the core with an off-the-shelf retail chip, not very likely...

[The-Fox]

GenTarkin, you got to test this batch man, according to my expectation it should be a bombastic one
Just try some max bClk with low multi and max on Stock cooler is a good indication too.

I am very close to pull the trigger on that stepping and I would really like to know how well it performs.

[dejanh]

GenTarkin, you got to test this batch man, according to my expectation it should be a bombastic one
Just try some max bClk with low multi and max on Stock cooler is a good indication too.

I am very close to pull the trigger on that stepping and I would really like to know how well it performs.

A and B are not steppings. The stepping on all of these chips is the same, C0. A/B stands for something else entirely...

I had a full explanation from Intel somewhere what the numbers mean, but I cannot seem to find where it is now...if I do I'll post it.

[Truckchase!]

then ditch prime.

I believe you're over-simplifying here, that system isn't stable.