E8500 OC Limit

[chjade84]

Has anyone seen any limits on the OC potential of the E8500? Mine is now at 4.06GHz on stock voltage with core temps of 39c idle and 50c load on air. Seems like 4.5GHz should be in reach with a bit more voltage but a 42% increase in speed seems a bit too good to be true.

Any thoughts?

 

[alvine]

review sides pushed them to 5ghz with healthy voltage increase

 

[rge]

Both my E8400 and E8600 scaled about .03V for every additional 100mhz once figuring out what 4ghz required for prime stable. I ended up with a middle of the road E8600 E0, for 4.2ghz (9x467) prime 12+hrs stable need 1.33cpuz, 4.3 needs 1.36, 4.4 needs 1.4, then starts scaling less well, needs ~1.63 for 5.0ghz, but had to use 1.65 b/c bios jumps 1.6 to 1.65. Mine was avg, NaMcO above mine on xtreme had awesome chip, 1.35v bios for 4500 stable.

http://www.xtremesystems.org/forums/showthread.php?t=197505&page=24
post 588 is mine, w/average chip, post 587 is namco with awesome chip...both E8600 but if E0 clocks same as E0 E8500, 10 multi is not needed except playing around anyways, If I had to do it over I would have gotten E8500 E0.

Good luck, sounds like yours may do better than mine....

 

[br3nd064]

If it's at 4ghz on stock voltages, I'd say 4.5ghz is within reach.

 

[V3NOM]

well even e8400's can get to 4.5ghz on air can't they...

 

[Homeboy2]

i can hit 4.5 with 1.4 voltage on my e8500 but it gives errors in prime 95. can run 4.4 with stability.

 

[Homeboy2]

Its an Asus P5Q pro. 120 after rebate. they are on sale at Newegg now for 105 AR.

 

[V3NOM]

and RAM?

 

[Homeboy2]

corsair ddr 800, i believe the ram must be the weak link stopping the stable 4.5

 

[bobbknight]

Look out for core voltage over 1.4v as they have a short lifespan with sudden death on the .45nm cpus.

 

[V3NOM]

45nm pentium duals = difference in life to 45nm core 2's?

 

[akandy]

Yah this chip OCs like crazy. I went as high as 4.6GHz 1.5V to get the highest 3DMarkVantage performance setting score for this chip. If someone gets a better score I will try to go higher. For daily use I have mine at 4.16GHz and 1.368 CPUZ(1.40625 BIOS). When I am set to upgrade to i7 I will OC this thing into a blazing fireball.

 

[murdoc]

I got a question for you guys.

I'm trying to OC E8500 right now and according to RealTemp 2.78.9 I'm reaching 75 degrees for my processor when running OCCT v2.0.1 at 3.9 ghz (1.34v).

I'm using Asus P5Q Motherboard so it comes with an AI SUITE utility which measures system and CPU temperatures and on that program it's saying I'm hitting 79 celcius at peak load on my CPU and system temperature is at ~41 degrees celcius.

Can someone tell me (judging that the measurements of the readings are a bit off) if I'm within safety margins or not? It looks scary that I'm hitting 75 on RealTemp and 80 degrees celcius on my AI Suite.

I'm currently using CoolMaster HyperTX2 for cooling. I wanted to upgrade to the latest 120mm Artic Cooling heatsink but I fear it will be too big and that it won't fit since my HyperTX2 can fit just perfectly within running into my ram slots.

Can someone give me some advice on this? Would I I need watercooling to cool this processor (eg: swiftech kit for CPU only)?

 

[Homeboy2]

first google real temp, download, and use it to monitor temps. those temps are way too high if correct.

 

[V3NOM]

err he measured it with real temp... is it calibrated correctly though? i bet AI Suite isn't l0ol

 

[br3nd064]

He measured those temps with realtemp... What's the TjMax set to?

 

[murdoc]

He measured those temps with realtemp... What's the TjMax set to?

TjMax set to -3.0 for both cores.

 

[Homeboy2]

guess i need my eyeballs recalibrated lol

 

[br3nd064]

Try using coretemp just to make sure it's not realtemp displaying the wrong temps. Also, are you sure the heatsink is making good contact with the cpu?

 

[murdoc]

It should be. I had to press really hard to get the 4 pins to click onto the motherboard. I looked at the reviews for Artic Cooling freezer Xtreme and it seems like Noctua NH-C12P will probably do a better job for performance/cooling ratio. But then again, it's hell expensive! Also due to its design I need to check if it fits in my case 🙁

 

[V3NOM]

why dont you look up the calibration for e8500??

 

[murdoc]

It's uncertain what the TjMax for E8500 should be. Some say 85 while others say 95. If I use 95 for standard I have to set the voltages to 1.37 to maintain stability at 4ghz. However at this voltage it pumps way too much heat out so it reaches 70 degrees even with TjMax set to 95. I failed both OCCT and Orthos testing.

OCCT gave me error 4 while Orthos terminated the test due to heat issues.

 

[V3NOM]

i thought all the 45nm's except the extremes ran at 100C tjmax. i have a zip file from intel somewhere around here..

 

[murdoc]

yes but regardless the temps jumped really quick when I ran at just 3.8ghz. The voltages required were insane!

I changed to E0 stepping recently on E8400 and the temps went down by 10 - 15 degrees instantly.

I would've been at around 80 degrees using Tjmax 100 @ 4 ghz on E8500 C0 w/ 1.36v and now I'm at 65ish degrees using E8400 @ 4 ghz using 1.29v

 

[teamlosigp]

well u know cause i was almost like 100% sure that u cant change the stepping in an intel proc unless u buy the newest version of the chip, i have a feeling ur bs us...