939 4000 Query

Deazy

Deazy

Deazy

Associate
Joined
1 Apr 2007
Posts
21
I have an MSI K8N Neo2 mobo and 2 x 512 Crucial memory.

I can get the 4000 San Diego up to 2640 but no futher. It wont take any voltage increase at all.

Settings at the moment are

Mutliplier 12
HT Freq 4
FSB 220
Memory set to 200

Is there any way round this problem ? Im sure Ive seen these chips running close to 3Mhz.
 
Do you know the stepping of the cpu? Not all will hit 3GHz. Also depends what fsb you motherboard is good for.

Have you tried dropping the multy down to 11 or even 10? Sometimes get better results with lower multy.

What voltage are you running it at and what are your load temps like?

When you say it wont take any voltage increase what do you mean? Have you tried raising the chipset voltage? Sometimes raising the pci-e freq to 101 or 102 mhz can help too.

Steppings the important thing though as not as cpus are good overclockers....even the ones with "good" steppings arent guaurenteed to overclock well :)
 
Hi and thanks for getting back to me.

Stepping is SH-E4 ? or maybe F71 as reported by CPU-Z. I have no idea if this is good or not :confused:

At the moment its running at 2676
Memory at 200
HT Freq 4
Multiplier 12
fsb 223
HTT Link 892
Core Voltage 1.45
Mem Volt 2.5
CPU temp is no problem under load
Chipset temp gets to 52

To increase the FSB to 225 (2700) I have to increase the core voltage to 5.5
then an extra %3.0. The cpu temp is not a problem but Speedfan reports a Temp 2 :confused: at 61 at load. I think this is the Northbridge chip , but whatever it is it seems a bit hot. I replaced the original failing fan on it with a Akaza but it still struggles at this voltage. I read that some boards just run hotter without problems but Im not sure if this is one of them.

I havent seen a reference in my Bios for chipset voltage or pci-e freqs but maybe they are in a different section of the bios.



Its just disappointing as my AMD 3500 would do 2500 so I just expected more from this.
 
The only way to find the full stepping code is to look at the cpu itself.

I used one of these http://www.overclockers.co.uk/showproduct.php?prodid=HS-044-TR with a 6/70mm fan on it for the chipset and temps fell through the floor. Like you said though that might not be the problem.

Need to know the stepping code as you may have been unlucky and just got a bad stepping thats only good for 2700.
Might just need an extra bit of voltage on the cpu. If load temps are ok then try nudging that up slowly and see if cpu responds to it.
 
if its an e4 stepping it probably wont overclock as well as jh8 e6 steppings.
 
Postman,

How does that cooler attach to the chip ? I just wonder as my mobo sits vertically and it looks like it would just fall off lol.

I downloaded a couple of speedfan profiles for my mobo and the chipset warning had been changed to 60, so maybe it is just a hotty and will take some more voltage if i can keep it cool enough. Still I suspect that the difference in performance between 2676 and maybe 2700 or just over is non existant
 
It comes with a bracket that fits over base and into the standard holes. Fiddly to fit especially as the chipset is glass and fragile like a gpu core!!! Worth it though if you like to see temps drop. Not sure how it performs without a fan but probably still better than the stock ones.

With the stock chipset cooler on dfi ultra board i was hitting near 50c but now with that on and fan on full its more like 30c under load. Not sure if it made and difference though. Thats with an opty 165 at 325x9 and the chipset voltage at 1.8v.

Your right about the extra 24MHz....wont notice except if benching and even then only very very slightly.

When you say your cpu temps are ok what are they hitting under load? Have you tried using coretemp instead of speedfan as that may give a more accurate reading.
 
I would say its your memory maxing out. You have the memory set at 200 but this increases as your final clock speed increases. Set it at 166 or even 133 untill you find out your best overclock. You can decide on the best memory divider after. Use CPU-Z to find out your current memory speed.

When you set your memory as "200" in the bios it presumes your final clock speed is the default 2400mhz. It actually sets your memory as:

CLOCK SPEED / 12 so 2400/12 is 200 but 2700/12 is 225.
 
Under load my CPU is , using Core Temp and SpeedFan temp is 36 so Im sure that it can take more heat. The Northbridge chip gets up to 54 though which is a bit more of a concern so maybe Ill try that cooler on it.

I set the memory to 100 while I was finding the CPU speed then reset it to 200 for testing but I 'll give it another whirl.

Alternatively I see Overclockers are selling a 3800 dual core which is E6 stepping and seems to overclock nicely according to its reviews.
 
36c under load is very good so plenty of headroom left there :)
More vcore wont hurt for sure. Run my sandy 3700 at 2950MHz at 1.52v and its quiet happy at 50c+ under load.

Have you considered an opteron if your looking for a cpu upgrade? Twice the L2 cache of X2 chips and good overclockers depending on stepping. The 165 are the cheapest but you need to get over 300fsb on them due to low multy (x9). The 185 ones have a higher multy but cost quiet a lot more.

If you can get your number of posts up to 250 you will probably pick one up on the members market for a nice price plus know that your getting a tried and tested cpu.

How high have you had the vcore at so far?
 
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