**Official e8400/e8500 Retail OC Thread

[laragirl83]

Yeah 1.65v+ 45nm on air is definitely asking for it. Sorry mate. Did you try installing the cpu into a different mobo before realizing it was dead? At any rate, there is a limit to the voltages these cpus can take. If you ask me, we're damn lucky these cpus are even operating at some of the voltages we're giving them on a daily basis.

How about idle 1.400V, load 1.368V...? With proper cooling, should I run it 24/7?

[AriciU]

Yeah 1.65v+ 45nm on air is definitely asking for it. Sorry mate. Did you try installing the cpu into a different mobo before realizing it was dead? At any rate, there is a limit to the voltages these cpus can take. If you ask me, we're damn lucky these cpus are even operating at some of the voltages we're giving them on a daily basis.

Yeah, i guess that's why it happened. I tried it on a P5K SE, it wouldn't boot.

Load temps @ 4.3 @ 1.5v we're 73C coretemp / 62-65C smartguardian.

[Zucker2k]

How about idle 1.400V, load 1.368V...? With proper cooling, should I run it 24/7?

Hmm, seems like a big vdroop you got there. Wonder how much that is affecting your stability. I wouldn't worry about your volts for 24/7. Right now, as it stands everybody is pretty much pushing volts according to your comfort levels. I believe as long as you can keep temps within spec. that should generally give you an idea as to what is safe. The voltage variances are so wide across the board that at this point we're practically beta testing for the next revision of these chips.

[Zucker2k]

Yeah, i guess that's why it happened. I tried it on a P5K SE, it wouldn't boot.

Load temps @ 4.3 @ 1.5v we're 73C coretemp / 62-65C smartguardian.

Well, if the cpu failed while you were switching to another board, then maybe you may have killed it through contact (shorting).

[AriciU]

Nah. I shutdown the pc, went out to get something, when i turned it back on it just wouldn't start... I thought it was the mobo initially so i went to a friend to test the mobo on his PSU... i then found out it was actually the cpu that was done for.

[dj883u2]

My E8500.

FPO: Q743A798

Vid: 1.0000v

Pack Date: 01/17/08

S-Spec: SLAPK

Version: E27437-001

Cooling: Water Cooling ---- T:25° Water

[Xvys]

I believe Intel has advised 1.365v as the recommended maximum vCore. While I have tested at 1.6v (4.6GHz) on air for 30 minutes or so, I don't see any degradation in mine, still o/c's at the same voltages as previously. I could eke out a bit higher FSB with this voltage, but I am satisfied with 4.0GHz and it is not flaky in any way. Here is my bios settings for a rock-solid o/c:

Ratio CMOS Setting : 9
FSB Frequency : 445
FSB Strap to North Bridge : 266
PCI-E Frequency: 100
DRAM Frequency: DDR2-1112
DRAM Command Rate : 2T
DRAM Timing Control: Manual
5-5-5-15, trfc 25

DRAM Static Read Control: ENABLED
Transaction Booster : DISABLED
Boost:0
PERFORMANCE LEVEL: 6

CPU Voltage : 1.365v
CPU PLL Voltage : 1.4v (Lowest Bios Setting)
North Bridge Voltage : 1.25v (Lowest Bios Setting)
DRAM Voltage : 2.1v
FSB Termination Voltage : 1.20v (Lowest Bios Setting)
South Bridge Voltage : Auto
Loadline Calibration : Enabled
CPU GTL Reference : Auto
North Bridge GTL Reference : Auto
Clock Voltage Over-Charging: Auto

CPU Spread Spectrum : Disabled
PCIE Spread Spectrum : Disabled

[Damien]

got mine today, it's a SLAPL Q746A518. anyone know how these do?

[Mav451]

Uh ? My VID just dropped from 1.0875 to 1.0375.
Obviously not in real time, but somewhere between the multiple reboots/tweaking yesterday, it must have changed.

Additionally: it was 1.1125 with 12/24 BIOS, but with 01/09 it was 1.0875 -- until just now.
I raised the VTT from 1.10 to 1.15 yesterday, but other than that the CPU vcore's been steadily set at 1.31 - which isn't very much at all.

[Spyrus]

got mine today, it's a SLAPL Q746A518. anyone know how these do?

80% of Q746 will do 4000+@1.3V orthos stable

[Zucker2k]

I wonder how this dynamic vid. might impact current flow/utilization/heat production inside of these cpus. How come I have never seen this under any circumstance on my overclocks? Those who reported dead chips, did you have this dynamic vid. situation? Let's keep an eye on that. Could be a bad implementation of the chips power saving features causing all these problems. My over-the-top theory.

[rge]

Wanted to see what volts it would take on my chip in 25C ambients to get a sub10 1M superpi. Was planning on no more than 15 mins at 1.5v, ended up being 1.5375bios. If my chip degrades after 15 mins...then I would just as soon use my E6850.

One thing, I thought it would be faster at 5,5,5 and 5:6, but 1M suppi was same or slightly faster at 4,4,4 and 1:1

[kiwi]

I can confirm that 45nm cpus degrade and degrade insanely fast Bad news to be honest

PEOPLE don't be crazy
don't Prime for 12hours that's just crazy. You will never in normal use stress the chip so much.....all you will do is end of killing the chip much quicker

let the chip be 1 hour stable, superpi stable and let it stand the test of time
not some crazy 12+ hour sessions

The best quick stability test is OCCT custom test cpu&ram 1 hour. It will point out errors that prime gives after 5+ hours.

[dogsx2]

I perfer to know my systems rock solid. While anywhere between 6-24 hours is good for me depending on my needs to play with the system. I don't fold, I game ALOT and I want to make sure if I game im not going to crash in the middle of it and loose hours if not weeks worth of gear just because I failed to test stabiliy (really thats an over exageration). I do some 3D Renderings sometimes and I know that chews CPU cycles and if that fails its not life or death but its nice to know I can complete a rendering without it failing on me.

You won't kill your chip for stability testing it. Thats the point of doing such. Heck my old E6400 chip I had, had a nice run of 48+ Hours of stability in Prime, forgot I left it running over the weekend oops hehe. That chips nice and stable from 3Ghz to 3.6Ghz with a good amoutn of voltage and even 3.76Ghz, just have the cooling to cool it.

Keep doing what your doing and we will find out if what worked for a 65nm works for a 45nm.

[PhilDoc]

I wonder how this dynamic vid. might impact current flow/utilization/heat production inside of these cpus. How come I have never seen this under any circumstance on my overclocks? Those who reported dead chips, did you have this dynamic vid. situation? Let's keep an eye on that. Could be a bad implementation of the chips power saving features causing all these problems. My over-the-top theory.

My vid changed when I loaded a new bios. Went form 1.000v to 1.1125v. I haven't noticed any degradation to this point, but I've never put more than 1.4v vcore through it. I've also disabled the power saving feature, if that matters.

[xVeinx]

I wonder how this dynamic vid. might impact current flow/utilization/heat production inside of these cpus. How come I have never seen this under any circumstance on my overclocks? Those who reported dead chips, did you have this dynamic vid. situation? Let's keep an eye on that. Could be a bad implementation of the chips power saving features causing all these problems. My over-the-top theory.

Since I'm looking at buying one of these puppies soon... is it possible that the power/voltages fed to the processor are fluctuating enough? I guess what I'm asking is if either certain boards ought to be preferred, or if mods need to be done to either better filter the power to the CPU and/or eliminate minute voltage fluctuations...

[Mav451]

Haha reboot, and it's back to 1.0875VID.

My vcore is at 1.31...so if that's what you're wondering about, it's not quite the same thing.

[mrcape]

EIST disabled ?

[jcniest5]

I saw a Q748A332 at MC, is it any good? Pack date is: 1/29/08. Was gonna buy it to replace my current inbalance temperature CPU (in my sig.), but finally backed out from it. Gonna try sell my current one first. If someone buys it, then I'm heading back to MC for that one. Hope it's still there.

[Mav451]

EIST disabled ?

Yeah. Everything's disabled in CPU features except:

Thermal Mgmt Control. << should I turn that off?
Core Multi-Processing

Looks like my voltages are gonna be quite a bit more than yours though...
1.32Vcore, and still nowhere near stable in that gray area between 3.9 and 4Ghz.

[mrcape]

Hmm, my Q748A115 was not so good. Did you thrash your current one, the Q745 with high voltage? Don't want you to be bummed on the second one.

Sorry this was reply to jcniest5.

[PhilDoc]

If you believe that the batch # really make a difference, then from what I've seen the Q743A's have been doing very well. I've seen 2 8500s with that do over 4.4G on air. All 5 8400's I've seen will do at least 4G and 4 of them are doing 4.3 or better. Personally, I think its luck of the draw regardless of the #s.

[Zucker2k]

Since I'm looking at buying one of these puppies soon... is it possible that the power/voltages fed to the processor are fluctuating enough? I guess what I'm asking is if either certain boards ought to be preferred, or if mods need to be done to either better filter the power to the CPU and/or eliminate minute voltage fluctuations...

Asus x38 boards feature epu (energy processing unit), a small voltage regulator that further streamlines energy flow to the cpu. Which begs the the question: Has anyone experienced this so called degradation on Asus x38?

Gigabyte is also implementing some kind of power-saving feature which in the long run, reduces the amount of power to the cpu, when it's not needed; but eist, and c1e can do these as well.

Edit: I'd also be interested in knowing if anyone on asus x38 has experienced the dynamic vid. scenario. I am yet to see that with my chip on Maximus.

[cadaveca]

VID on maximus formula only changes when proper features in bios are enabled. My first degraded on Formula SE.

[ThatGuy16]

What was the max voltage you had given it?