matter

Hi

I have problem with OCing my computer.
NF7 1.2 (latest bios)
Barton 2500+
9800pro
H2O cooled

When i boost my FSB over 190, computer became unstable.
In games, picture and sound freeze, then i have to manualy restart PC.

It work OK by having FSB at 180 and raising multiplier, but i would prefer higher FSB (who doesnt).

I tried with high Vcore up to 1.9 (i wouldnt go higher) and vdimm 2.9.

Ram timings are: 2.5-3-3-11, and other "small" bios settings are "OC friendly" (recomended for OCing read from forums).

Any idea ?

krips

Try uping the voltage to the ram and or chipset and or loosen memory timings.

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Lowfat

what kind of ram are you using? pc3200? if not thats the problem, if so. then i have no idea.

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matter

tnx for reply

I use pc3200 rams, so that shouldnt be problem.

And about timings, i dont know how to loose timing. What timgs should i set, to be looser.

Lowfat

you shouldn't have to loosen the timings. the ram is good to 200 fps @ stock timings. I seriously dont know what could be the problem though. Have you tried updating the bios or use a modded bios?

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matter

hi

Well the bios is latest.As for modded bios, i would like to try it, but havent found moded bios for nf7 1.2 yet.

Geminiwave

its also entirely possible that the chip is just a POS. its great to say that you can expect a certain overclock, but sometimes you just cant overclock a chip. Once in a long while you win the suckage lottery.

try it in a friends PC and see whats up just to be safe.

one more thing...check your voltages in the BIOS or via some sort of motherboard monitor. Do they fluctuate? Are they +\- 5% of what they should be? If yes to any of these questions, then you have your answer.

how old is your PSU?

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matter

I doubt for voltages, since my computer OC OK with lower fsb. Now i run at 185*13 and is perfectly stable at 1.8V.

Voltages looks like (from speedfan):
Vcore: 1.74 (bios 1.8)
Vdimm 2.8 (same in bios)

+3.3 is 3,25V
+5 is +5V
+12 is +11.80V
-12 is -11,95V
-5 is -5V
+5 VSB is +5.4
Vbat 3,55V

and PSU is not old, i recently shange it when i bought 9800 pro. But it is noname cheap PSU

Could mossfets be the problem ?

The_Neon_Cowboy

Try 1.82v vcore, 200 FSB, and a lower muiltipler that will put the speed about stock if that still fails..... it could be the CPU won't handle it BUT it's more lickly it's the board.

Then the problem lies in your chipset votage your south bridge isn't getting enough voltage....in wich case it will require a voltmod to get to 200FSB.
Some bard require soldering but most there is a delicate pencil trick that can do the job....

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Geminiwave

uhh if its a FSB problem, I'd say its probably his north bridge that needs the added voltage man.

oh speaking of which, its possible that your northbridge is overheating. Have you touched the heatsink on the northbridge to see how it is? Could get pretty hot.

but yeah if you can lower your multiplier, then take it down and put up 200FSB.

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matter

tnx for reply

I tried lowering my multiplier, and raise FSB, but same problem.

As for NB and cooling, i will try toucing it, but i doubt, since it is also water cooled.

I guess i ran out of luck for cpu and/or mobo

Will try more voltage on NB though, but how high can i go ?

Geminiwave

dang...it really sounds like a board problem. Unless you can get a hold of another CPU maybe and test it? Cause seriously most chips will do the FSB if you lower the multi. its a rare breed that wont. Then again its a rare NF7 that wont OC...

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Fantasma

Are you using dual channel and 2x512Mb sticks?
If that is the problem, I had a similar problem with my ram in a Nf7-S rev2 board and I solved it by flashing the bios with a modded one with CPC OFF

matter

Yes, i am using 2x512 dual.

So i changed it to 2x512 single, and problems still exists. But this time , computer was stable a little longer.

Where can i get modded bios for nf7 1.2 ?
All i found was revision 2 only

matter

I finaly managed to solve the problem

I had to do the L12 mod on procesor like described here.

Now i ran at 205 stable. I think that for more i need more volts, and better ram.

Lowfat

if he did this he would also get worse perfomance. but good to hear its working fine again.

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Geminiwave

so you cut the bridge? I'd be interested to see how that works. I can run everything at stock voltage up until 190mhz...then after that I have to keep jacking the voltage up hugely to get to 200mhz...I'm pretty sure it can go faster though. Actually I know for a fact that the power supply is playing a role since recently its voltages have been getting unstable. ah well.

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matter

Well if you have same spec as i do (nf7 1.2 and 166fsb CPU) then you could give it a try.

My problem is next:

at fsb 210, in game i get no signal on monitor.
I tried 220x10 and when my sistem boot, i get scrambled screen (like some sorf of artifacts) then i get no signal.

Could it be PSU problem (graphic card dosnt get enough power) ?
I have a goal, and that is 220FSB, and still cant reach it

My rams are ok, since they are made up to 400mhz.

any idea ?

Fantasma

When I reached 400, I had to replace my PSU because I didn´t get enough power to get it running properly, also your card simply can´t reach 220Mhz, I could reach that with the CPC OFF bios that made me lose performance but I gained it again at 220Mhz

virgo

I have a similar setup and MB and also did the L12 mod,but used a small wire bridge instead of cutting.It works no problem but like you it would not run at 220mhz but runs fine at 219mhz,seems to not like some settings,just try experimenting