**Official e8400/e8500 Retail OC Thread

[Blackwhite]

I'm still strugling with my Mobo and E8400
I need 1.368v to run 4GHz, but in BIOS I have to set 1.485v , so it means vdrop is 0.117
New BIOS is needed!!!

[unclewebb]

Read the Micron datasheet for D9 DDR2 memory and you will see that it is only factory rated at 1.8 volts. When people are overclocking they usually start giving their memory voltages like 2.3 or 2.4 volts. In my experience, bad memory is usually the cause of most performance and stability degradation. It will be interesting to see some reports from XS users how the 45nm chips are holding up long term, like maybe a month or so at 4+ GHz.

It might even be that 45nm is more sturdy than older chips.

Intel wouldn't have raised TjMax if they thought otherwise. TjMax represents the highest safe operating temperature for a C2D so a bump up in this rating is a sign that Intel is pretty confident in these new processors, even at extreme temperatures.

[sofarfrome]

I'm still strugling with my Mobo and E8400
I need 1.368v to run 4GHz, but in BIOS I have to set 1.485v , so it means vdrop is 0.117
New BIOS is needed!!!

That is not vdroop, it is offset between what you set in bios and what is indicated by windows. What you need to do is launch P95 or Orthos and then look at the CPUz 1.368v. The amount it drops when the CPU is loaded is vdroop. Better yet, use a voltmeter and measure the REAL vdroop.

[mrcape]

Read the Micron datasheet for D9 DDR2 memory and you will see that it is only factory rated at 1.8 volts. When people are overclocking they usually start giving their memory voltages like 2.3 or 2.4 volts. In my experience, bad memory is usually the cause of most performance and stability degradation. It will be interesting to see some reports from XS users how the 45nm chips are holding up long term, like maybe a month or so at 4+ GHz.

I really hope they are holding up well! I want to run these suckers hot.

I understand that in the past overvolting has been fine if you can keep the temps down, it's just that there are conflicting reports about 45nm. Reports that come from the same guys who love to throw voltage at chips, not the conservative types.

[Zucker2k]

I've even pumped 1.6250v (bios) set, and on posting, I saw CPU Overvolt warning, still booted into windows fine and trying to determine max clocks. I tell ya, once you broach the subject, people are going to be pointing to the cpu instead of troubleshooting other things.

[hazardous]

Q745a576
box date 1/4/08
lapped and ready to go!

breaking 4ghz at about 1.22v orthos stable on x38
now playing with the fsb, pics later

[Zucker2k]

I'm still strugling with my Mobo and E8400
I need 1.368v to run 4GHz, but in BIOS I have to set 1.485v , so it means vdrop is 0.117
New BIOS is needed!!!

0.117 This would give me 200mhz.

[flopper]

My vdrop is .5 or so.
temps are off tho,
65c idle orginal e8400.
4ghz 68c.
orthos, 95c.

Looking for answers on the net shows, seems as either a bios issue or a temp issue with the e8400 series.
No clear winner yet

[Zucker2k]

My vdrop is .5 or so.
temps are off tho,
65c idle orginal e8400.
4ghz 68c.
orthos, 95c.

Looking for answers on the net shows, seems as either a bios issue or a temp issue with the e8400 series.
No clear winner yet

No way!!!! Because you're saying your volts drop from eg. 1.500v to 1.000v? Impossible.

[Mav451]

My vdrop is .5 or so.
temps are off tho,
65c idle orginal e8400.
4ghz 68c.
orthos, 95c.

Looking for answers on the net shows, seems as either a bios issue or a temp issue with the e8400 series.
No clear winner yet

You may want to update your sig. You're on a Wolfdale now

[flopper]

No way!!!! Because you're saying your volts drop from eg. 1.500v to 1.000v? Impossible.

humph,
correct, 1.400 to 1.350 would be acurate
me and electronics dont adjust well.

[Plastok]

VID in coretemp can be buggy i think
Look at mine

[Blackwhite]

That is not vdroop, it is offset between what you set in bios and what is indicated by windows. What you need to do is launch P95 or Orthos and then look at the CPUz 1.368v. The amount it drops when the CPU is loaded is vdroop. Better yet, use a voltmeter and measure the REAL vdroop.

Can you give me a link , how can I measure CPU voltage using a voltometer please.
BTW my English is not so good (I'm Polish) - I understand this offset is bad, and looks like my CPU is crap?
In Windows i've got 1.4V - in orthos 1.368 - that means vdrop is 0.032v.

[RADCOM]

Anybody got a Q745A346 pack date 17/01/08? I can't test mind due to Asus Striker Extremes amazing ability to fubb

[JoeBar]

I returned my Q748A242 today (max orthos speed was 3.8ghz ) just to realize that all other cpus (10 of them) were Q748's also...

I decided to grab a new one Q748A141 and at least it's a bit better that the old. Right now priming for 2 hours @ 4.0ghz with 1.39v under load. Still a very high vcore for 4.0ghz but at least it doesn't top @ 3.8ghz...

Seems like Q748's constantly produce the worst results. Better avoid them if u can...

[Grnfinger]

I never wrote that 8 CPU's died . They just degraded . You should read more carefuly next time !

Mainly I reported less Mhz stable . 8 cpu's till yesterday ... 9 today , as another user in a forum here in Greece today reported that his CPU has lost Mhz also.

Also , 3 QX9650 (Hipro5 , Shamino , Victorwang) . You can find the posts here in XS for these CPUs. Also there is one 8400ES that died while benching (ln2) .

A new poll has been opened in thelab.gr today and already 38% voted that they noticed a degradation ... 33% doesn't tried with voltage so they don't know ... and 16% voted that the clocks are the same .

This is very interesting news, would you have a link to this thread by chance?
I have been watching my MHz and bench scores since this rumour/fact started. It will be 1 week Thursday and I have not seen any performance/stability loss......yet.

[Stelios]

This is very interesting news, would you have a link to this thread by chance?
I have been watching my MHz and bench scores since this rumour/fact started. It will be 1 week Thursday and I have not seen any performance/stability loss......yet.

The poll thread ? It's in Greek btw . (http://www.thelab.gr/showthread.php?threadid=46871)

What voltages are you running ???
Faster way is to use orthos/prime95 . Write down your current numbers , and check them after some days .

[rge]

Orthos run so far, 1.2875 bios, 1.28 CPUZ for 4.0, will let it run overnight. I have loadline enabled so voltage in bios matches voltage in cpuz, vdroop is still ~.008 to .01. My batch in sig.

Wonder if any way that a single post could be edited by all people. Be nice for each person to list handle (some accountability for accuracy) their cpu batch, and volts needed for 4, 4.1, 4.2, etc. and get some idea of how these scale. Too much work for one person, especially one with a new toy.

[Ron 61]

Can you give me a link , how can I measure CPU voltage using a voltometer please.
BTW my English is not so good (I'm Polish) - I understand this offset is bad, and looks like my CPU is crap?
In Windows i've got 1.4V - in orthos 1.368 - that means vdrop is 0.032v.

http://www.xtremesystems.org/forums/...re#post2389552
Post #1885 is a good pic of measure point on board. With beta 16.b04 uguru is real close to what my DMM reads. When uguru reads 1.32v to 1.34v my DMM reads 1.34v. I just wish abit would fix the damn bios. No doubt they have had access to engineering samples of wolfdale for quite some time. Good luck.

[Supertim0r]

My chip is incredibely cool. I see some members on water at 60c+ low vcore

I'm at 50-51c loaded 4ghz 1.36v with a tuniq @ 800rpm in a lowcfm/silent case

Even at 1.45v, I barely hit 58-60c MAX

[Ron 61]

Uguru reports my temps as 33c idle and 50c loaded. Core temp on the other hand reports 51c idle 68c loaded. Thats a 17c spread on both but I think core temp is off because even at default vcore 1.1v core temp reports 48c idle. When I touch the base of my Thermalright it is barely warm while under orthos load.

[BooStFeD]

Product code : BX80570E8400 S-spec : SLAPL
MM # 895733
Fpo/Batch # Q748A142
version # E27439-001 max 1.225v pack date 01/09/08

P5B Deluxe, vdroop pencil mod.
1.328v idle, 1.336v load.

pretty weird temp though. 24C roomtemp. idling at 42C and loading at 58-62C. fuzion, mcw60, pa120.2, mcp655. thats hotter than my e6600 heh ill try to remount the block a few more times.

Below is my E8400 running on a P5B Deluxe.

I feel my temps are a bit high as compared with yours for water. I however have not done a remount.

Maybe core temp is to blame for temps being off.

What bios are you using?

E8400
FPO/Batch = Q746A489
Pack Date = 1/09/08
MB P5B Deluxe Bios 1226

Testing 450 * 9
Bios Vcore = 1.350v
Idle Vcore = 1.320v
Load Vcore = 1.296v

CPU is on water with old DD TDX WB
Going to remount WB but I am concerned about temps.

CPU Idle = 41c / 36c
CPU Load = 56c / 55c
Ambient = 23c

Think I have a bad mount?

[X.T.R.E.M.E_ICE]

My chip is incredibely cool. I see some members on water at 60c+ low vcore

I'm at 50-51c loaded 4ghz 1.36v with a tuniq @ 800rpm in a lowcfm/silent case

Even at 1.45v, I barely hit 58-60c MAX

Cortemp screenshot?. My tuniq fan runs at about 450rpm and my cores idle about 49c at 1.2v

[jaredpace]

you could start a spreadsheet on google docs, and link to it in the OP. like

FPO
BATCH
VID.... etc

then when everyones data is voluntarily put into the spreadsheet, 1 user at a time collaboratively, you could sort by any column like a database, and see which versions or mobo combinations are best with the e8400

[Supertim0r]

Cortemp screenshot?. My tuniq fan runs at about 450rpm and my cores idle about 49c at 1.2v

This one is Q740A473T
18-19c room temp

The tuniq is so cool to the touch, i might try running completely passive

I have an other Q740A553T running approx same oc 8-9c higher