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post #3991 of 5036
Quote:
Originally Posted by kromar View Post
it was just a test and after all it wasnt stable, fed the bear to early again... looks like all the problems come from the high FSB and it looks like i cant get that stable at all any tips to make it stable besides increasing the NB voltage?

oh and the ram is back to cl7 since that is definitely not where the problem is.
So did it turn out the increased PCI-E clock isn't actually stable for you?

I really think you're shooting for clocks past your hardware's limitations, sadly to say. I have conceded the same as well with my hardware.
    
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post #3992 of 5036
Quote:
Originally Posted by GanjaSMK View Post
So did it turn out the increased PCI-E clock isn't actually stable for you?

I really think you're shooting for clocks past your hardware's limitations, sadly to say. I have conceded the same as well with my hardware.
no its not. its hard t believe that a FSB of 250 is the maximum for my hardware since the 790's are usually able to do 280-300 without problems...
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post #3993 of 5036
Quote:
Originally Posted by kromar View Post
no its not. its hard t believe that a FSB of 250 is the maximum for my hardware since the 790's are usually able to do 280-300 without problems...
You have to excuse my ignorance, I only seem to notice through scanning posts that you haven't ever really found solid ground with your clocks.

My M4A78T-E (and the one before this I sent in as an RMA) both can do stable FBS speeds of 300+. 790GX/750SB

Not sure why you're having the issues you are. So where is your PCI-E clock at right now?
    
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post #3994 of 5036
Quote:
Originally Posted by GanjaSMK View Post
You have to excuse my ignorance, I only seem to notice through scanning posts that you haven't ever really found solid ground with your clocks.

My M4A78T-E (and the one before this I sent in as an RMA) both can do stable FBS speeds of 300+. 790GX/750SB

Not sure why you're having the issues you are. So where is your PCI-E clock at right now?
yeah never found something stable above 3.5ghz... someone just mentioned in an other thread that the CPU-NB voltage and not the NB voltage increases FSB stability so maybe that was my error all this time.

if that is true i will need to up the CPU-NB voltage when increasing the FSB and the NB freq.? and how high can i go with the CPU-NB voltage? i think it turns red at about 1.6v or so

i set the PCI clock back to 100 till i can figure out whats the problem with the FSB stability.
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post #3995 of 5036
Quote:
Originally Posted by kromar View Post
yeah never found something stable above 3.5ghz... someone just mentioned in an other thread that the CPU-NB voltage and not the NB voltage increases FSB stability so maybe that was my error all this time.

if that is true i will need to up the CPU-NB voltage when increasing the FSB and the NB freq.? and how high can i go with the CPU-NB voltage? i think it turns red at about 1.6v or so

i set the PCI clock back to 100 till i can figure out whats the problem with the FSB stability.
Basically you need to try something like this:

300x12.5 CPU Ratio = 3750Mhz or 266x14 = 3725~ or 280x13.5 = 3780~

CPU vCORE = 1.4+ depending on your chip/motherboard.
CPU-NB = 1.3+ up to but not exceeding 1.5v for anything 2400+. Stock voltage should be fine up to 2400 give/take also depending on chip/motherboard

NB voltage = Auto or default. No need to increase it.
Memory timings = Auto or loose, 2T until you can find stable CPU clocks. If you have 1600Mhz RAM, use the stock timings for 1600 at 1333 for sake of eliminating the RAM as cause of instability.

That's at least a starting point higher than 3.5, and you can adjust the FSB/CPU Ratio until you find something that works. I'm sure you already know the common ones:

286x14 = 4.004
250x14 = 3.750
266x14= 3.725
268x14= 3.752
290x13.5 = 3.915
279x14 = 3.906

etc etc etc - You just have to find clocks that are somewhat stable then fine tune the FBS clock until you have no more crashes. IE; if 268 is unstable, try 266, then 264 etc, until you found your limit - whatever it may be.
    
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post #3996 of 5036
well i am testing at the moment if a higher CPU-NB voltage brings any stability to my system and therefore i keep all other values as close to stock as possible. so far it really looks like that it brings the stability.

so this was a major misunderstanding i had because i never thought i would need to increase the CPU-NB v when increasing the FSB and always tried increasing the NB v
when i think of it now it all makes sense... i also never thought about why i need higher CPU-NB voltage for the NB speed whit a higher FSB... seems pretty obvious now and i should have seen it

then again i dont understand why i always see people here with really low CPU-NB voltage and high FSB and NB. can it be that my board just needs a lot more juice there than others?

EDIT: what exactly are these combinations?
Code:
286x14 = 4.004
250x14 = 3.750
266x14= 3.725
268x14= 3.752
290x13.5 = 3.915
279x14 = 3.906

Edited by kromar - 3/5/11 at 4:25pm
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post #3997 of 5036
Quote:
Originally Posted by kromar View Post
EDIT: what exactly are these combinations?
Code:
286x14 = 4.004
250x14 = 3.750
266x14= 3.725
268x14= 3.752
290x13.5 = 3.915
279x14 = 3.906
I figured those would be self explanatory but I guess not.

Those are FSB/CPU multiplier ratios which will give you resulting speeds.

IE; FSB (base clock) of 300 (stock is 200) x CPU multi of 12.5 (stock is 14, can't go higher but can change to a lower multi) = CPU frequency of 3.750Ghz or 3750Mhz.

Just simple math. I've been under the impression you knew all of this. Maybe you should consult some overclocking guides again as a refresher? I know I do from time to time.
    
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post #3998 of 5036
well sure i know how that works, just thought there was something more to these combinations:O
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post #3999 of 5036
Quote:
Originally Posted by kromar View Post
well sure i know how that works, just thought there was something more to these combinations:O
Well, there is more. The resulting FSB (base) clock will affect your HT Link frequency and your RAM frequency as well as your CPU/NB frequency.
    
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post #4000 of 5036
i think ive done enough testing to notice that
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