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post #1981 of 2408
Quote:
Originally Posted by SazBard View Post
If it failed with the cpu underclocked then it is definitely a fsb and nb/sb issue.

I would try raising your NB/SB (MCH as it is known in some bios's) voltage. Put it at about 1.3v for now while you test for a stable OC. Also put FSB voltage at 1.3v.

MCH GTL ref voltage definitely helped for me, I have mine at 0.67*VTT (raised it from 0.63*VTT). However I haven't touched the CPU GTL ref voltages which are at 0.63*vtt I believe.

I strongly doubt your memory speed at 800 (1600) is the issue, especially since that is what your memory is rated at.

Also, did you switch off C1E and speedstep in the bios. they can cause instability in some cases.

good luck and keep me updated on how you get on!
I already had my NB voltage set at 1.30v (I even tried 1.34v and 1.36v) and VTT at 1.34 when any of the cores would randomly give me rounding errors at Prime95.

I tried messing with the CPU GTL ref voltages and while some settings were better than others, I never succeeded in running Prime95 for more than 4h without errors. Then, I gave up searching for the GTL sweet spot, lowered my FSB at 460MHz and left Prime95 running overnight. The next morning and after 9hours that I checked, it was still running without any errors whatsoever!

Anyways, I've spent almost 4 days trying to stabilize my system at 475FSB and to be honest I don't think the difference between that and 460FSB is significant enough to justify all this. I might make a last attempt again and change the NB GTL voltage (didn't touch this before) to see if it has any effect. But if Prime95 still reports errors, I think I'll just leave it at 460FSB.

Having said that, I appreciate all the help you provided here guys!

PS. Forgot to tell that I've disabled all CPU power saving settings including C1E and Speedstep.
Edited by Eaglelake - 2/3/11 at 6:36pm
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post #1982 of 2408
Hi Guys!

I'm back and I've been overclocking!

I have a few typical noob questions for you guys:

1. I have noticed that when I overclock the CPU, the voltage reading in CPU-Z gets higher, despite me not having done anything to the BIOS in that regard. (Maybe it's on auto, I didn't notice).

With a 3.2Ghz (8x multiplier) and 400Mhz FSB (1600), the voltage reads 1.344v. I checked Intel's ARK and that value seems to be within the VID range for this CPU, so I should be ok, right ? I noticed that the reading gets below 1.3 (something like 1.28v) if I overclock it to 3.2Ghz, but keeping the 8.5 multiplier, and a 377 Mhz FSB (1508 FSB). Should I try to set the voltage manually to it's default value, or should I let the BIOS handle it as it has until now ? It seems stable, both with 377 and 400Mhz FSB.


2. Are there any major downsides or upsides of using an uneven CPU multiplier ? I have overclocked the CPU to the same 3.2Ghz speed for starters, and did it in the two ways I wrote above: lowering the multiplier to 8x and raising the FSB to 400, or keeping the original multiplier and getting the FSB to just 377 FSB. The downside of this last approach is that the RAM runs at 754 instead of 800 Mhz. However, the CPU idles at 2.262 Ghz instead of 2.4, and the Voltage reading on CPU-Z is lower, like I said above.

So, despite the power saving advantages, using a 377 FSB gets me slower RAM and an uneven multiplier. Supposedly, using 8x multiplier, with everything synced is better, performance wise, right ?

At idle I can't tell the difference, the CPU has the very same idle temperatures, but I doubt it will get hotter at full speed given it's core speed is the same (although it's communicating faster with the outside). I am a bit worried about the Northbridge though. Should I pay any special attention to it ? It's true this board will do 1600FSB, it's rated for it, but it's also not actively cooled. The arctic cooling freezer 7 pro I'm using is not giving it any air. I do have a set of 120mm intake and exhaust fans though. Is that enough ?

Should I just go all out to 8.5x and 400Mhz for 3.4 Ghz goodness ? I'm a bit reluctant because I suspect that for games it will do me better if I overclock my GTX 460 first (to something like 750/775 Mhz).

Cheers!
 
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post #1983 of 2408
Sounds like you do have the voltages on Auto which will over volt them by quite a bit and will definitely go up the more you OC it. You want to set the main voltages manually to prevent that problem. Personally I would run CoreTemp to determine what the VID is and set the vcore in the bios to that to see if it is stable at 8 x 400. If not, try bumping it up a notch or two. I would also recommend running it at 8.5 x 400 instead if you can as that will give you 3.4GHz. You should be able to do that with the stock vcore or a slight bump.

The odd multiplier won't be any less stable, but for optimal results you should run the ram as close to it's rates speed as possible.

My recommendation if you additional questions is to download the MIT.txt file from my sig, fill it out, then post it in the EP45 thread (also in my sig) as the guys over there know that board the best. Be sure to use the advanced editor and change the font to Courier New so it displays properly.
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post #1984 of 2408
Thanks for the quick reply!

I just have a question regarding the VID; when I start Core Temp the program tells me the VID is 1.1000v, but then goes to 1.2875v, which it also displayed before when the CPU was at stock speeds. And then it goes up and down a few times between 1.1000v and 1.2875v.

I'm inclined to believe this is the true VID; 1.1000v seems too low, right ? And besides, it only displays 1.1000v when it's idling at 2.4Ghz (6x400FSB) or 2.6 Ghz . If it goes to 2.8Ghz or above it will display 1.2875v.

EDIT: I went to the BIOS, pressed Ctrl+F1 at the main screen, and then in the MIB Tweaker section I could already check all the parameters (sometimes I forget the trick - why is it that Gigabyte does not documet this feature in the manual ?)

Anyway, the CPU Vcore is stated at 1.28750, so I guess this is really the VID, right ?

It was on Auto, and I changed it to normal (and now CPU-Z never goes above 1.232v) . I also set the RAM voltage to normal. However, there's a bunch of things in there still on Auto, like MCH/ICH voltages, etc. Should I set all those to Normal too ? Is the motherboard compensating for the FSB overclock on these settings too ? Does a 400Mhz FSB not work on normal settings and needs manual tweaking ?
Edited by tpi2007 - 2/3/11 at 10:08pm
 
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post #1985 of 2408
1.2875 is the actual vid. 1.100 is what it drops back to when SpeedStep kicks in and it runs in Power Saving Mode.

Gigabyte DOES document the Ctrl + F1 in the manuals for their motherboards that do have that. From what I have seen the EP45-UD3 series of boards do not need that.

Setting the ram voltage (vdimm) to normal will undervolt it. That ram is designed to run at 800Mz with 4-4-4-12 timings at 2.1v for optimal performance. To make sure the system will at least post so you can get into the bios it defaults to 800MHz with 5-5-5-15 (or 18) timings at 1.8v. You need to MANUALLY set the timings and the vdimm.

You should read this thread about setting the voltages on that board. Quite often you can run at a fsb of 400 without changing any of them, but sometimes you can't. That's why it's a good idea to read that thread as it explains the settings and ho to determine what you need to do with them.
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post #1986 of 2408
Hmmm, I've also got a Gigabyte P31-S3G motherboard that didn't document the feature in the manual, but did feature that hidden bonus.

I'm not sure if Ctrl+F1 did anything to show all the settings in my P45, although the screen did blink as in the P31-S3G. Anyway, I'll check again to see if it's needed or not in my case.

As to my dimms, actually I bought a model that is meant to work at 1.8v (stock) at 5-5-5-18. I just put it in normal because I remember once they were being overvolted at stock timings and just for precaution I put it in normal again - (I had forgotten to do it the last time I flashed the latest BIOS) - although I think the latest BIOS version got it right and didn't overvolt them at stock timings.

There was another memory kit just like this one that advertised to work with tighter timings as you mention. I guess mine could work faster with more voltage, after all they sport the same fancy heatsinks, but I'm staying as it is for now in this department. But thanks for the tip. Do you think I'd get a meaningful improvement from tighter timings ?

Thanks for the link, I'll read about the voltages!

Cheers!
 
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post #1987 of 2408
See the second paragraph on page 31.

Quote:
BIOS (Basic Input and Output System) records hardware parameters of the system in the CMOS on the motherboard. Its major functions include conducting the Power-On Self-Test (POST) during system startup, saving system parameters and loading operating system, etc. BIOS includes a BIOS Setup program that allows the user to modify basic system configuration settings or to activate certain system features. When the power is turned off, the battery on the motherboard supplies the necessary power to the CMOS to keep the configuration values in the CMOS.

To access the BIOS Setup program, press the <Delete> key during the POST when the power is turned on. To see more advanced BIOS Setup menu options, you can press <Ctrl> + <F1> in the main menu of the BIOS Setup program.
It's still listed in the EP45 manuals but unless you have a very early bios revision it doesn't actually do anything and I'm not even certain if it worked then or not.

So you have this ram then. In that case you are correct to run it at 1.8 or possibly 1.9v with 5-5-5-18 timings. It's doubtful that yours will be able to run 4-4-4-12 even with 2.2 to 2.3v. You can try tweaking the timings a bit to see if you can get better memory performance, but I wouldn't count on it.
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post #1988 of 2408
I added the info from the settings thread to the front of the EP45 thread so it's easier to find.
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post #1989 of 2408
Quote:
Originally Posted by PapaSmurf View Post
See the second paragraph on page 31.



It's still listed in the EP45 manuals but unless you have a very early bios revision it doesn't actually do anything and I'm not even certain if it worked then or not.

So you have this ram then. In that case you are correct to run it at 1.8 or possibly 1.9v with 5-5-5-18 timings. It's doubtful that yours will be able to run 4-4-4-12 even with 2.2 to 2.3v. You can try tweaking the timings a bit to see if you can get better memory performance, but I wouldn't count on it.

You're right about the Ctrl+F1, it's there. It's page 31 for the P31-S3G and page 33 for my EP45-UD3LR, but as you said, and I checked it, Pressing Ctrl+F1 doesn't do anything on the P45 board. (I have the latest F11 Bios)

As to the memory, yep, that's it, exactly! I bought them at a very nice price at the time though, so I can't complain.

Cheers!
 
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post #1990 of 2408
Nothing wrong with that ram at all. I went several years with the regular XMS2 version of that ram (with the standard heatsinks) and never had any problems with them. It never mattered until I got the Q9550 and wanted to OC it to 4GHz and above.
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