X2 3800+ Manchester OC Question

[kmbak]

Hi!
I put "new" CPU (X2 3800 S939 Manchaster) to my rig recently and have a question.
I want to OC and don't know what voltage for CPU to use...
Everyone are talking about stock voltage (AMD says that is 1.30-1.35).
Now I have 10% OC (10x220) and everything under 1.35V is not stable?! Is it normal?
On 1.35 everything is OK (Everest shows 1.36-1.38 in fact). Temps on the cores are 58 and 56 degree (maximum momentary values with 1-2 hours of Orthos stress), CPU temp (socket) 51 degree. Infos from Everest. I have Scythe Infinity on the CPU and QFAN Enabled at 51 degree (Asus A8N SLI Deluxe) so maximum RPM is enabled above 51 degree - I didnt achieved it yet. At 51 degree CPU FAN has about 950 RPM. Ambient temp is about 27-28 degree.

But I want to put FSB higher... Are the temps safe?
With Zalman 7000Cu Cooler my temps where much higher (66 & 63 for cores and 56 on the socket and was stable but too high I think). All sets was like above.

Could you post your advice and experience about that CPU, Mobo and Cooler? Please post exact voltage (BIOS and from Everest would be great), FSB etc... All details please!

Thanks for any help!

 

[myocardia]

First, the stock vcore for your cpu is not 1.30v, it's 1.35v. So, right now you're giving your cpu it's stock vcore. With your heatsink, up to ~1.45v is safe, though some around here will tell you that higher is safe. Here's a beginners guide to overclocking A64's: link.

 

[Rhoxed]

thats weird... what stepping is it? i have a toledo core 3800 x2 that easily does 2.32ghz as i speak on 1.3 vcore with idle temps @ 31C

 

[kmbak]

Thanks for so fast replies.

First I have to say I know a lot about AMD OC. My A64 3200 Venice knew about it a lot too...

But I haven't got experience with dualcore and that's why I'm asking you about it...
Procedure of OC is the same for single and duar-core I supose...

But I don't know about critical things like max temps, voltage (now I know that 1.45 its ok) etc.

Why AMD says that default voltage is (for Manchester and Toledo) 1.30-1.35? That's stupid...

 

[kmbak]

Originally posted by: Rhoxed
thats weird... what stepping is it? i have a toledo core 3800 x2 that easily does 2.32ghz as i speak on 1.3 vcore with idle temps @ 31C

I have Manchester (E4), 10x220. HeatPower is the same for toledo and manchester - it's 89W. What cooler have you got?
My idle temps are 36-37 (ambient like above - about 27C) but CPU FAN goes only 500-600RPM...

Maybe I should turn one of the 120mm fan to flow air on the CPU heatsink but I don't know how it influence on the others components... Is it a good solutions? CPU temps will be noticable lower but what about the rest?

 

[Rhoxed]

i have a zalman 9700NT cooler @ 1,200rpm right now@ 2.3 proc easily reaches 2.88 with 1.52 vcore

 

[Rhoxed]

BTW the stepping is located on the actual processor, only way way to find it is to take off your HS there will be a string of numbers and letters for example mine is "CCBWE" 0545VPMW

 

[kmbak]

Hello again.

After few hours of testing I switch FSB to 240MHz (10x240MHz)... Almost 5h with Orthos and it is stable. I have to do 12h test. But I have a question. My vcore is 1.40. And temps are: ambient: 23C, CPU Case: 49C, Core 1: 56-59!, Core 2: 51-53. Are these temps ok? Core 1 is crazy. Why there are so big disproportions? Maybe it is wrong CPU Core 1 sensor calibration? Any ideas?

I can't achieve stable 2600Mhz (CPU -> 10 x 260, RAM was working divider, at 433 - its a nominal for my sticks) even at vcore=1.5V so it's a CPU problem or - PSU! I have a quite big drop of 12V voltage ->11.48V!) Do you think it might be a PSU? I have 420W NeoTec.

 

[myocardia]

You are supposed to be running your RAM as slow as possible, not as fast as possible-- that's your problem for now. But, you definitely need to replace that cheap psu. Also, I'm assuming you're using the stock AMD heatsink? If so, I wouldn't try to go any higher, until you get something that will cool your processor better.

 

[kmbak]

myocardia! Please read my sig and earilier posts... I'm not use AMD heat sink and you read about it and reply earilier! PSU is/was not cheap. I agree - its not well known mark but it a good PSU. In spite of this it is too weak for X2 and I have it for three years so it is overworked a little...

About RAM - I want to use their maximum potential power - that mean I want to be as close as possible to their nominal speed. So if they can run 433 I will use it like that.
I know that my Patriot are stable with CL2 at 400-440MHz and CL2.5 at 440-480MHz - thats a very useful information for me. When Orthos dies and mems are at "safe" settings like above I know that reason of error is in CPU or PSU or...?

Know I want to know what do you think about temps.

 

[myocardia]

Originally posted by: kmbak
myocardia! Please read my sig and earilier posts... I'm not use AMD heat sink and you read about it and reply earilier!

Yeah, my bad, although it wasn't in your signature when I wrote that reply. You have high temps for an X2 @ 2.4 Ghz, though, even with 1.40v of vcore, especially since you're using a Scythe Infinity.

PSU is/was not cheap. I agree - its not well known mark but it a good PSU. In spite of this it is too weak for X2 and I have it for three years so it is overworked a little...

Even if you paid $250,000 for your psu, 3 years ago, it looks to me like it doesn't have enough power to run your system, along with overclocking both your video card and cpu.

About RAM - I want to use their maximum potential power - that mean I want to be as close as possible to their nominal speed. So if they can run 433 I will use it like that.
I know that my Patriot are stable with CL2 at 400-440MHz and CL2.5 at 440-480MHz - thats a very useful information for me.

So, which are you trying to find out the maximum overclock of, your CPU, or your RAM? If it's your CPU, set you RAM to the lowest setting your motherboard has for it, and find out how high your cpu will overclock.

When Orthos dies and mems are at "safe" settings like above I know that reason of error is in CPU or PSU or...?[/

Or the memory controller, which is inside of the CPU, on your processor. And the higher you overclock the CPU, the more stress it puts on the memory controller. You should really read the link I gave you in my first post in this thread.

 

[kmbak]

Ok. For now (until change PSU) I leave 2400 MHz (10x240). And (thats the best info) at stock voltage - 1.35V). Cores temps are <53 and CPU case <48 after 6h of Orthos (23C ambient).

About high temps in eariler settings. I have Q-FAN options enablet at 51C. So the FAN was working at 900RPM - and probably thats why cores goes 58C. Max speed of FAN is acheivd when CPU case is 52C degree.

After changing PSU I will try sth more...

Thanks for your help!

 

[Comdrpopnfresh]

I have an x2 3800+ manchester as well. First and foremost- make sure c'n'q is turned off. And even when you find your max overclock, use "crystalcpuid"
you can set three levels of clocking vs c'n'q's max and low
I have it set to 10x260 @ 1.350V for max, 7.5x260 (~1950mhz) @1.2V, and 4x (thats right 4x, whereas c'n'q only lets you go down to 6!) 4x260 for 1040mhz @ 1.1v!
you can also easily set the processor speed to each of those setting on the taskbar by the clock, and change the way it decided to change from one level to another (change setting load levels and timeing delays. you can go for cooling with speed when you need it, or a faster, more responsive system than with c'n'q)

I've booted into windows @1.6V 10x290 before with 1:1 ratio on the ram (i have 4 dimms, for 2gb total, and this stuff will run steady at 3-3.15V @ 600mhz). My only long-run stable are the setting above though (like 2 days on orthos w/ gromac stress). If you wanna know more bout by setup- check my rig on my info, and pm me