e6700 @ 3.75 Ghz.. but... high temps at load

[jg0001]

What is the safe upper threshhold for an e6700 chip, temperature wise (for prolonged periods)? My 3.5 Ghz OC seems safe at 47-50C at load, but for 3.75 Ghz, I need more voltage and end up at 62-65C at load. Is that too much?


So far on my e6700 + P5W DH, I've managed the following overclocks (note: zalman 9500AT on CPU and a few EXTRA 80MM fans directed right at the mobo)

2.66Ghz
non-OC'd (for temps only)
temps -- 25C idle, 33C at load

3.5 Ghz
Other than the usual stuff, here are my settings in the JumperFree section:
Memory voltage at 1.90 (rated 1.80 +- 0.1 (old crappy 533 speed ram)
Vcore @ 1.45 V
PCIe @ 100; PCI @ 33.33
Everything else at auto INCLUDING vMCH
--ran 18.5 hour Prime95, no errors...
temperatures of 35C idle; 47-49 at load

3.75 Ghz
Memory voltage at 1.90
Vcore @ 1.65 V
vMCH @ 1.65 V
PCIe @ 100; PCI @ 33.33
I found I needed to put the vMCH @ 1.55 just to get into WinXP.. I tried every combo of vMCH and Vcore and kept stepping both up to get to the point where P95 didn't fail immediately -- so far, only 1.65V on BOTH works (if I lower either one, it fails in the first test)
--I've run Prime95 (with CPU Burnin on 2nd core) for 10 tests (not too long, but long enough compared to the auto-fails of other tests -- I will continue this) and had no issues... I'll run a longer test, but am worried about the 65C reported by PC Probe II

Comments and suggestions? Is my old crapola ram holding me back from getting better clocks at lower voltages or does that have nothing to do with it?

(I also tried 3.9 Ghz, but it tended to CRASH windows within a few minutes of trying anything intense)

 

[Kango2020]

Some comments and questions:

1) You aren't clear about the source of your temps. What does Core Temp read? How about Intel's Thermal Analysis Tool? Everest? There are several read points that each of these addresses. Just some more details will help you decide if things are OK.

2) Are you running P95 on one core? Or on both cores? For a proper stress test you need to run P95 on both cores at the same time. I'd recommend using ORTHOS instead of Prime95 since it uses both cores by design.

3) 65C is high (IMHO) but not a dangerous high. It will shorten the life of your CPU but you will still probably get a couple of years out of it. The E6700 has a max thermal temp of 60.1C. So you're above the stated maximum of Intel.

4) Your Zalman is a very good HSF so if you can't get a lower temp via lowering the voltages and frequencies, you might consider water. Otherwise, you may have to relax your 24/7 operating frequency a bit.

Good luck.

 

[Baked]

LOL, Vcore @ 1.65V, you're gonna fry that chip.

I think I got a really good E6400 chip. It can do 3200 @ only 1.275V, but needs 1.350V to run 3400, both orthos + memtest tested. I can take it to 3600 @ 1.350V too, but not stable. 3400 is plenty good for me, I don't wanna put too much juice in it 'cause the retail box sticker says 1.35V max.

 

[lopri]

1.65V with Zalman 9500?! :Q

For a reference my reports (P5W-DH BIOS) idle temp 18~19C for my E6700. Gosh I can't even "want" to believe it! In reality it idles around 44~46C @3.6GHz according to CoreTemp.

 

[jg0001]

1.65V is my BIOS setting for the cpu voltage... PC Probe II reports 1.58-1.60 Volts.. if it matters...

It's now plowed through 2 hours of Prim95 + CPU BurnIn + 2GB game downloading in the background... no errors so far. (Yes, I know it isn't the test setup most of you like.. I'll get that orthos thing soon).

I am likely to clock it back down to 3.5 Ghz.. I'm not sure the benefits of the extra speed make up for the incredible amount of additional heat and stress it is under. What I don't necessarily understand is why I need so much extra voltage and others do not... is it the crappy ram perhaps or something else? Luck of the draw? Hmmm....

 

[n7]

1.65V? :Q

d00d, just leave it at 3.5 GHz 1.45V.

I wouldn't go over 1.5V myself...

 

[Polish3d]

Back that voltage down man unless you're not terribly concerned with ruining your chip

 

[jg0001]

Yeah yeah///

Went back to 3.5 Ghz.

Still, I'd like some ideas as to WHY it takes my chip so much voltage to get to that speed when many of you are running lesser chips nearly as fast at lower voltage... is it my memory?

 

[n7]

Luck perhaps?

Overclocking results are never guaranteed.

I don't know many times i've posted that.

As for your RAM being an issue...it's possible.

 

[jg0001]

Is there anyone out there who also has a e6700+P5W DH on air with better results?
(and please, NO 'ES' results -- unless and until engineering samples go on sale at newegg, every time they are mentioned there should be a huge disclaimer not to expect similar results).