3800X2 Overclocking help.

Chris19

Chris19

Chris19

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12 Dec 2005
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I cant seem to be able to get my cpu to boot into windows on any setting higher than 2.7Ghz. I have tried raising the V Core to 1.8 and have set the memory on a big divider so i know it cant be that causing the problem.

The motherboard im using is a DFi SLi-DR Socket 939.

Anyone got any ideas? i want to be able to push this chip as far as its gonna go as thinking about getting a quad core anyway :p .

Thanks in advance
 
1.8v vcore on air? Thats pushing it to say the least and is probably risky to the chips life...what are your temps like.

try upping the north bridge voltage a knotch...or lower the vcore to 1.55 and see if that helps....as 1.8v may simply be more than your chip can handle.

ghgh
 
The cpu temps never go over 50oC its cooled by a D-tek Fuzion which is on its own loop with a triple rad. The only temp that is getting abit high would be the one labelled Motherboard on Everest, Dont really know what its for tho i would have guessed the north bridge but there is also a separate temperature for that
 
2.7ghz on air for a 3800 is bloody good by my book mine which i got wllmost 2 years ago (2years next month) on my DFI SLI DR would do 2.35ghz on air (1.5v 60c+ on both cores after 24hours of Orthos with a xp-120 heatsink) with water (Swiftec kit + storm block) max i got was 2.55ghz with 1.6v
 
Chris19 said:
The cpu temps never go over 50oC its cooled by a D-tek Fuzion which is on its own loop with a triple rad. The only temp that is getting abit high would be the one labelled Motherboard on Everest, Dont really know what its for tho i would have guessed the north bridge but there is also a separate temperature for that
Click to expand...
Maybe it's from a sensor amongst the power conversion components on the motherboard - that's not a bad place to have a temperature reading for.

Looks like I got very lucky - my X2 3800 will do 2.7 at 1.35V on air, but the hottest core reaches 62C under full load (Orthos, S&M). With better cooling, I'm sure it would go higher. I've backed it down to 2.6 to knock a couple of degrees off. That gives me better performance anyway, as my memory failed S&M memory test on a 5/6 divider with the CPU at 2.7 but passes with it at 2.6. 220MHz seems to be the limit for my memory. 260 "FSB", 10x multi and 5/6 divider seems to be the optimum performance settings for me...but I do want to know how far my X2 3800 will go.
 
KillBoY_UK said:
2.7ghz on air for a 3800 is bloody good by my book mine which i got wllmost 2 years ago (2years next month) on my DFI SLI DR would do 2.35ghz on air (1.5v 60c+ on both cores after 24hours of Orthos with a xp-120 heatsink)
Click to expand...
Angilion said:
my X2 3800 will do 2.7 at 1.35V on air, but the hottest core reaches 62C under full load (Orthos, S&M). With better cooling, I'm sure it would go higher. I've backed it down to 2.6 to knock a couple of degrees off.
Click to expand...
Seems these chips do overclock quite well, been playing around with mine the past few days slowly pushing upwards, still gunning for 2800MHz! :D

toledo3800x22700mhzmx3.jpg

Toledo™3800+ X2 (LCB9E 0632DPMW) - 1.375vCore/BIOS - Thermalright XP-120 & Sharkoon 120mm '2000'

The XP-120 really has made a difference to the temps compared to the stock opteron 170 heatpipe cooler I was using before. Max Orthos load I have seen so far is 46°C which is pretty sweet for an overclocked multi-core.
 
Chris19 said:
The only temp that is getting abit high would be the one labelled Motherboard on Everest, Dont really know what its for tho i would have guessed the north bridge but there is also a separate temperature for that
Click to expand...
Angilion said:
Maybe it's from a sensor amongst the power conversion components on the motherboard - that's not a bad place to have a temperature reading for.
Click to expand...
I think that would be the Mosfets, they do get quite hot while running an overclocked/over-volted CPU.

toledo3800x22700mhzmosffy4.jpg


I have my XP-120 fitted back-to-front kinda, the heatpipes are on the left hand side near the case backpanel and the overhang bit is facing the right, when the fan is mounted it is blowing air down onto my cpu & memory instead of down onto the cpu and little Mosfet cooler on the ASUS A8N-SLI Premium.

I'm no expert at these things but I believe the hotter the mosfets get the more unstable the vCore becomes i.e it starts to fluctuate which is not good for an overclock. If you can keep the Mosfets cooler then that helps keep the vCore levels nice and steady!
 
Hmm...the outer edge of fan 3 appears to be travelling at more than 2000mph (if it's a 120mm fan). Do you get a sonic boom when you power up? :)
 


Edit: Have dropped my multiplier to 270x10 as its more stable on the x10 tho it does run 'ok' on 2800

:D
 
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A bit of messing and I seem to have found the limit for mine at 1.35V - 2720. Above that and it isn't stable. At 2800, it'll boot and work, but won't even manage SuperPI 1M (rounding error).

Back down to 2.5 for me - I can keep the fans down to near-silent at that speed and have reasonable temps, and it works well for memory speed too.

Maybe one day I'll feed it more volts and see how far it will go, but for now I'm going to stay at a prudent overclock.
 
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