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Old 04-06-07, 05:12 PM   #1
911medic
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Question Overclocking Help

All right guys, a little OC'ing advice needed here. Built the PC in my sig a month or two ago, and while it OC's pretty well (~3GHZ from stock of 1.8GHz is nothing to sneeze at), it seems like I'm hitting some kind of artificial wall. I have read numerous P5B-family OCing threads at places like XtremeSystems and TechRepository forums, but have had no success. I'm hoping someone here sees something obvious that I'm missing, short of soldering the board to get NB voltage adjustment.

The voltage options in my P5B-E (rev. 1.01G) are rather limited. I can alter the CPU vCore, vDIMM (up to 2.1v max), and FSB Termination Voltage only. These boards are known for their vDroop, but a simple pencil mod has rectified that.

I can OC the CPU (running memory 1:1 with relatively loose timings of 5-5-5-15, which keeps the memory underclocked, so it should not be the problem) at stock voltage all the way up to ~330MHz FSB. Adding vCore beyond this point only gets me a slight OC improvement (340MHz FSB, not 24/7 stable), at the cost of huge temperature penalty.

Speaking of temps, this board is really hard to believe when it comes to CPU temp reporting. Flashing different BIOSes has altered the reported CPU temps, as has turning on/off "PECI" in the BIOS. Sometimes I can get temps that are below ambient, which I know is wrong. Using CoreTemp/SpeedFan/MBM gets me the individual core readings, which are more believable. I idle in the low-to-mid 20's C (at a room temp of ~21C). At stock voltages, load temps rise to around 50C. As I type this, I'm running at 340MHz FSB/1.55v w/Orthos small FFTs running in the background, and my cores are running at 64-65C (my motherboard CPU reading shows 75C). That's literally a 40C temp delta from idle, which I'm NOT happy about, and is about the absolute max I'm willing to try.

I have vDIMM set at 2.1v, FSB Termination voltage maxed at 1.45v (I don't even know for sure if this has any affect at the relatively low FSB speeds I'm using), and vCore has been tried anywhere from stock (1.325v) to a max of around 1.55v, which is about as far as I want to go on air.

The passive chipset heatsinks get VERY warm, even at stock speeds. The NB heatsink is will burn my fingers when OCing. Adding a 120mm fan (see below) has helped.

Thinking it may have been my old case not coping with hot new components very well, I modded it to add a 120mm fan on the side panel (blowing in over the video card and chipset heatsinks), as well as a 120mm blowhole fan exhausting thru the top. This has reduced the "motherboard" temp my P5B-E reports from 42C to around 30C. I also lapped both my Tuniq Tower and my E4300 heatspreader (they were both surprisingly concave), and while that's helped w/idle temps slightly, it hasn't really affected load temps or OC stability.

So, after all that, any ideas? Am I just missing the NB voltage adjustments? Or does this sound more like a CPU that is just maxed out? This is my first go-round with Intel OCing, after Athlon XP/64 OCing in the past, so am I just screwing something up? I guess I was hoping for something around 3.4GHz with this chip, with its 9x multiplier, or even as high as 3.6GHz, which would be 400FSB, running memory in sync. Maybe I'm just dreaming...
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Old 04-06-07, 05:28 PM   #2
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Default Re: Overclocking Help

Strange...

I just d/l'd CoreTemp 0.95 (updating from 0.94 beta), and the newer version reports different temps YET AGAIN! CoreTemp used to agree w/SpeedFan and MBM, but now it's showing even HIGHER temps than my motherboard CPU reading.

Version 0.94:
CoreTemp/MBM/SpeedFan show loaded temp of 65C on each core, motherboard shows 75C
Version 0.95:
MBM/SpeedFan show 65C, motherboard shows 75C, CoreTemp now shows 80C!

Why is temp reading this CPU/motherboard so variable? Arrrrgh!
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Old 04-06-07, 05:28 PM   #3
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Default Re: Overclocking Help

Honestly, if you have asked around Tech Repository, Tony should be able to aide you through this better than me.

However, I can say that it looks like your CPU is maxed out. The e4300s that I have seen have not been OCing as well as the old e6300s, and not even the new lower-end model Conroes (e6300 & 6400) have been clocking as high. My guess is Kentsfield binning.

Also, I dont think you need to adjust chipset voltage. P5B easily goes above 450; mid 300s should be incredibily easy. vdimm should, also, only help when you reach higher bus speeds. (the 2.1 limit should not hinder your achieving of 400+ fsb)

freecableguy and Tony are the ones to ask though
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Old 04-06-07, 05:40 PM   #4
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Default Re: Overclocking Help

Quote:
Originally Posted by buffbiff21
Honestly, if you have asked around Tech Repository, Tony should be able to aide you through this better than me.

However, I can say that it looks like your CPU is maxed out. The e4300s that I have seen have not been OCing as well as the old e6300s, and not even the new lower-end model Conroes (e6300 & 6400) have been clocking as high. My guess is Kentsfield binning.

Also, I dont think you need to adjust chipset voltage. P5B easily goes above 450; mid 300s should be incredibily easy. vdimm should, also, only help when you reach higher bus speeds. (the 2.1 limit should not hinder your achieving of 400+ fsb)

freecableguy and Tony are the ones to ask though
Thanks for the reply. I haven't asked around there, but have read some very helpful/informative threads over there.

I'm thinking you're right about my CPU. I have never run into one that responds so minimally to vCore. I mean, 10MHz FSB is all I get by really pushing the vCore. I was hoping it was something else.

I didn't think I was pushing either the memory or chipsets' limits at these speeds, but again, I was hoping for a solution other than "CPU at its limits."

Again, thanks for your opinion.
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Old 04-06-07, 05:45 PM   #5
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Default Re: Overclocking Help

Quote:
Originally Posted by 911medic
Again, thanks for your opinion.
There is no such thing as opinion.

Hope that helped
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Old 04-06-07, 08:21 PM   #6
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Default Re: Overclocking Help

Quote:
Originally Posted by buffbiff21
There is no such thing as opinion.

Hope that helped
Hmmm... Then thanks for your "approximation of truth."
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Old 04-06-07, 08:28 PM   #7
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Default Re: Overclocking Help

Quote:
Originally Posted by 911medic
Hmmm... Then thanks for your "approximation of truth."
There ya go! It was merely a conjecture: an educated guess or "hypothesis."

BTW I was born in Minneapolis
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Old 04-06-07, 09:07 PM   #8
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Default Re: Overclocking Help

Quote:
Originally Posted by buffbiff21
There ya go! It was merely a conjecture: an educated guess or "hypothesis."

BTW I was born in Minneapolis
Then you wised up and moved south to San Diego! Actually, Minneapolis was moving south from where I was born.

It's 20F here right now, with a 17mph wind out of the NW.

I hate winter.
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Old 04-06-07, 09:17 PM   #9
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Default Re: Overclocking Help

Yeah ^, I (barely) recall getting frostbite when I was real young.
I lived there till I was 3 and my parents divorced... my dad still lives there. But it's weird - my parents are still friends, sort of... like I still see my dad frequently.

Anyway... didn't mean to delve into my life story Hope you find out what is holding back your OC.
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Old 04-06-07, 09:18 PM   #10
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Default Re: Overclocking Help

Thanks...
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Old 04-06-07, 10:34 PM   #11
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Default Re: Overclocking Help

I have a P5B Vanilla.
I hit a wall between either 360 to 400 or its 370 to 400 fsb. I forget which. But once I hit 401fsb my mobo goes to a new strapping according to the article below.

For the overclock in my sig i need:
Cpu 1.53v
Ram 2.1v
fsb termination 1.4v

Article on Strapping: http://www.thetechrepository.com/sho...hp?p=32#post32

P5B Oc guide:
http://www.thetechrepository.com/showthread.php?t=41

Maby gives those links a try.
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Old 04-07-07, 11:39 AM   #12
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Default Re: Overclocking Help

Thanks...

Yeah, I've read those already. But skipping right to 400 or 401 won't even allow me to POST. And I get nowhere near that FSB hole that most encounter between 360 and 400.

I'm beginning to come to grips w/my CPU just being maxed.
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