The Socket 939 Appreciation Club and Knowledgebase [Official] - Page 123 - Overclock.net

blitz6804 · 03-23-08

At pioneerisloud's advice, I will consider turning off CnQ such that I can overvolt the processor slightly and maybe finally be able to reach a 3.0 GHz suicide.

That will not be until after I finish my Appellate brief however, so start checking in around 1700h EDT.

pioneerisloud · 03-23-08

As always...looking forward to your results

.

**txtmstrjoe** · 03-23-08

Quote:

Originally Posted by blitz6804

I do a lot of multi tasking and really need the 4 GB. I may try dropping my divider to 2:1 to see if I can get the processor any higher, but I think I have hit a voltage wall here. Under load, the processor only gets 1.312 V (as shown in the screen shot) instead of its 1.350 V as per the BIOS. Idling with CnQ shut off has it up to 1.335 V. Idle with CnQ is 1.070V instead of 1.100 V as per the BIOS.

Checking speed fan shows similar voltage results: my +12 V rail is down to + 11 V, -12 V rail is down to -5.6 V, -5 V is down to -3.3 V, and the -3.3 V is down to -1.6 V. All these are based off memory, expect them to be off a volt or two.

Can you tell I have an HD 3850? Can you imagine if I tried to run that thing on a non-certified PSU? What sucks is that the power connector on my 8-pin PCI-E rail is wrong: there is a round and a square swapped. Because of that, I cannot use it in the video card, and instead, must use the 8-pin to 2-molex adapter to power the thing.

Hmm... maybe the OCing difficulties lie in an insufficient PSU...

Unless your motherboard sensors are out of whack, those aren't very healthy readings coming from SpeedFan.

GuardianOdin · 03-23-08

Quote:

Originally Posted by txtmstrjoe

Hmm... maybe the OCing difficulties lie in an insufficient PSU...

Unless your motherboard sensors are out of whack, those aren't very healthy readings coming from SpeedFan.

that could be, but I run a 600watt and have no issues.UNLESS his PSU is not pushing the amps.

blitz6804 · 03-23-08

As I said, I checked with AMD/ATI. This power supply is certified for my processor and video card. I would blame the motherboard on not properly calling for the voltages.

I mean, why should I not do so? It likes to play games with my FSB! 200 = 201. 251 = 252. And of course, 254 = 254.5 just to name a few.

**thlnk3r** · 03-23-08

Quote:

Originally Posted by blitz6804

I do a lot of multi tasking and really need the 4 GB.

Checking speed fan shows similar voltage results: my +12 V rail is down to + 11 V, -12 V rail is down to -5.6 V, -5 V is down to -3.3 V, and the -3.3 V is down to -1.6 V. All these are based off memory, expect them to be off a volt or two.

Blitz, for testing purposes I suggested that you remove 2 sticks of memory to see if that helped your OC. Regardless if you need it for multitasking ect, it would be good to know what is holding you back (if there is something holding you back). Remember there is more stress on the IMC with 4 DIMMs filled. You might get the occasional, "but I have 4 sticks and my OC is great!"...I consider those to be lucky.
Software monitoring isn't going to be accurate at all with your PSU voltages. I'd suggest testing the rails with a multimeter. Here is a guide that I hope is helpful on explaining this process: http://www.devhardware.com/forums/po...est-75111.html. It's kind of an old guide but all you need to do is measure the 3 rails. Is the Antec the PSU in question? That model has plenty on the 12volt rail (40amps) for your 3850. With my 3850 PCI-E, it was recommended that I have 33 amps for total system power. Shoot that Antec is overkill at 480watts.

Good luck

blitz6804 · 03-23-08

I have a 650 watt Antec. As I said, according to AMD, this is a certified power supply for my video card. I am sure the four DIMMs is having an effect on me. When I only had two DIMMs, I was running them at DDR 440 (1:1 with the CPU) sans any issue.

Any time I get too ambitious with my overclock, rendering the system un-POSTable, I un-plug it, remove two DIMMs, re-plug it in and power it up. Then I can dial it back and then replace the two.

**thlnk3r** · 03-23-08

Blitz, it's not really 650 watts just FYI. 170 of that goes to the 3.3v and 5v standby

. Do you have a multimeter handy to test the voltages of the power supply. I guess I'm a little confused, what is still the problem with your setup?

Good luck

blitz6804 · 03-23-08

I do not have a multimeter.

My issue is so far, the highest stable OC I can get with 4 DIMMs is FSB = 250, Divider = 200:166.

Reducing the divider to 200:150 or even 200:133 does not improve stability over FSB = 250. I am assuming this is an undervolt issue. At load, my CPU is only getting 1.31 V (the BIOS says it should be getting 1.35 V). In order to test higher FSBs, I assume I will finally need to let go of CnQ. Even if I can get a suicide or two higher than my best (2.8 GHz), that would be cool.

Hey, for the 3.0 GHz club, do you need to be suicide stable, or actually stable?

**thlnk3r** · 03-23-08

Blitz, have you found out what the maximum limit is for your motherboard? I was able to get into Windows with my K8NSC-939 at 310HTT. Here is a guide that explains on how to find the limits of each component: http://www.overclock.net/faqs/31782-...pu-memory.html. Sorry if you've already read over this guide but I believe your board is capable of getting higher reference clocks speeds. Make sure to also disable CnQ when testing each component.

Good luck

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