Overclock.net › Forums › AMD › AMD - General › Sabertooth 990fx FSb raising issues
New Posts  All Forums:Forum Nav:

Sabertooth 990fx FSb raising issues

post #1 of 7
Thread Starter 
Hi all,

Here is my first thread, and before writting about my problem sorry for my english (french people inside^^)

So I'm not such a newbie in Oc'ing, I have been using my phenom II X4 980 on my sabertooth at 4.2Ghz with a 250 fsb... That was quiet good but not enough for me.. so I flash my bios (first version) with the last version avalaible in order to have something clean. (all my setup is in my presentation in new members wink.gif )

So the first thing is to have a high fsb.. higher than before because i Know sabertooth is good for high fsb (300). I downclock ram at 400 under cpu z, i keep cpu freq and NB and HT near origin, and rise fsb... 260 okay 270 okay and then 280, not working.... I boot , come on windows, and i start occt, but in 2 or 3 minutes, blue screen or error on #x core...

So my question is, even if all is @stock, rising my fsb need that I raise a voltage in bios? which should I modify? Or is it just the "Wall" of my sabertooth?

Thank you for advices wink.gif
post #2 of 7
4.2 ghz oc is really really good for a phenom II,
post #3 of 7
Thread Starter 
Yeah I know it's quiet good in air cooling, but the main goal of this modification is to have at least the same freq for the processor but whith higher fsb and lower cpu ratio (black edition), and i think the higher the fsb the better the overall performance is... that's why I want to reach the upper limit of thr fsb.. but I don't know if raising the fsb in such a value need to touch some voltages or not, considering that all other component are stock or even lower...
post #4 of 7
Quote:
Originally Posted by Phantom42 View Post

Yeah I know it's quiet good in air cooling, but the main goal of this modification is to have at least the same freq for the processor but whith higher fsb and lower cpu ratio (black edition), and i think the higher the fsb the better the overall performance is... that's why I want to reach the upper limit of thr fsb.. but I don't know if raising the fsb in such a value need to touch some voltages or not, considering that all other component are stock or even lower...

Having a high FSB instead of raising the multiplier a lot doesn't really have as much of an effect on performance as some people like to make it out... Just use the multiplier to get close to your max OC, then use the FSB to "fine-tune" the OC and squeeze out the last few MHz from your system. I raised my multipliers to bring my CPU to 4.2 GHz and my NB to 3.0 GHz and then I added 6 MHz to the FSB which got me an OC of about 4.25 on the CPU, 3.1 on the NB, and 1650 on the memory.

No need to stress about keeping the FSB high, I've benchmarked my system with it OC'd both ways (multi vs FSB) and there was no conceivable difference outside of the normal variations you see whenever doing multiple benchmark runs.
     
  hide details  
Reply
     
  hide details  
Reply
post #5 of 7
Thread Starter 
Thanks for the advice Ganja... there is some polemic about fsb vs coef raising tht's a fact but that's also true that the gain is near 0...
In fact by rising fsb i want also to OC my ram by keeping my ratio 1:2..cause this give some improvement in super pi.. and I can only raise fsb to OC my ram keeping this ratio... Sorry I don't know if i'm clear^^
post #6 of 7
I know what you are saying... you will probably need to start from scratch with overclocking the system again - sometimes a BIOS update really changes up the way that the motherboard controls voltages to the components on the board. I often avoid updating my BIOS at all costs because of this fact, it's just not usually worth it to upgrade the BIOS unless you are having some sort of issue which would make flashing the BIOS absolutely necessary.

I'd start from scratch with the OC, isolate each component and OC it from there. Start with the FSB, then the CPU, then the NB, and finally the RAM and see if you can get it stable again with the new BIOS.

It might be easiest to just OC using the multipliers and then buy a faster RAM kit instead of needing to OC the ram, which will have the same effect in Super Pi as overclocking the RAM does. What speed did you have the RAM clocked to? That motherboard can take some very fast memory by default, and DDR3 is cheap right now thumb.gif
     
  hide details  
Reply
     
  hide details  
Reply
post #7 of 7
Thread Starter 
Hey ! Now I have 4*corsair vengence 1600 cas 9 2go... i have downclocked them to 800mhz to have the 1:2 ratio... so perhaps I will keep them and let my fsb at 275... but for my personal knowledge, does anyone know which voltage can help fsb rising if only this fsb is rising??
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD - General
Overclock.net › Forums › AMD › AMD - General › Sabertooth 990fx FSb raising issues