AMD FX OC'ers Club

[d1nky]

so, lets get this clear. you was fully stable at 4.4ghz 1.4v

and then all of a sudden youre not! everytime ya try overclock back to how it was you crash.

i say up the volts and see if it fixes it.

 

[Durvelle27]

so, lets get this clear. you was fully stable at 4.4ghz 1.4v

and then all of a sudden youre not! everytime ya try overclock back to how it was you crash.

i say up the volts and see if it fixes it.

No it was stable at 4.4GHz @1.3875v but thats about it . can't go any higher

 

[d1nky]

for some people going from 4.4 to the next increase requires a lot more volts.

for me 1.3875 gets 4.35ghz prime stable

4.4ghz 1.44v
4.5 - 1.46

and so on

 

[Durvelle27]

for some people going from 4.4 to the next increase requires a lot more volts.

for me 1.3875 gets 4.35ghz prime stable

4.4ghz 1.44v
4.5 - 1.46

and so on

That's a lot of volts

 

[d1nky]

yea some can do the same with lower and some with higher.

im talking about actual volts at load. a LOT of people say their volts before LLC kicks in.

for example 4.8ghz @ 1.42v (then LLC will take that to 1.49v)

5ghz needs about 1.6v
4.8ghz needs about 1.52v

this is for my chip tho

 

[Durvelle27]

Thing about adding volts. My board only has 6+2 Power Phase

 

[d1nky]

your board will also throttle if vrms get toasty.

i should think it would be fine (with enough cooling) up to 1.48v if temps allow.

make sure the vrms have a fan blowing on them when stress testing. and maybe a fan on the rear of the board - vrm circuitiry

 

[Durvelle27]

your board will also throttle if vrms get toasty.

i should think it would be fine (with enough cooling) up to 1.48v if temps allow.

make sure the vrms have a fan blowing on them when stress testing. and maybe a fan on the rear of the board - vrm circuitiry

I have a huge fan on the side of my case

 

[Johan45]

I initially had the M5A99fx board which was 6+2. and it will top out around 1.43ish with the eight core. You just might be at your limit. Just watch your socket temps.

 

[d1nky]

ok so my CPUNB can be stable at 2.7-2.8ghz with 1.3875v

my ram with magic timings can be stable up to 2528mhz 1.7v

i need an FSB number that allows me to have 2.7/8 cpunb and ram at 2500mhz

anyone good at maths lol

 

[Random Murderer]

ok so my CPUNB can be stable at 2.7-2.8ghz with 1.3875v

my ram with magic timings can be stable up to 2528mhz 1.7v

i need an FSB number that allows me to have 2.7/8 cpunb and ram at 2500mhz

anyone good at maths lol

268 FSB. RAM at 1866 strap should give you 2500. NB at 10x will give you 2680.
250 FSB. RAM at 2000 strap should give you 2500. NB at 11x will give you 2750.
234 FSB. RAM at 2133 strap should give you 2495. NB at 12x will give you 2808.
208 FSB. RAM at 2400 strap should give you 2496. NB at 13x will give you 2704.

Take your pick.

I did a ton of maths like this for my 3820 overclock, so I have a table of formulas to refer to

 

[Johan45]

The HT ref clock is pretty flexible on these chips too Dinky. I've had mine up to 306, couldn't get 310 out of it.

 

[d1nky]

268 FSB. RAM at 1866 strap should give you 2500. NB at 10x will give you 2680.
250 FSB. RAM at 2000 strap should give you 2500. NB at 11x will give you 2750.
234 FSB. RAM at 2133 strap should give you 2495. NB at 12x will give you 2808.
208 FSB. RAM at 2400 strap should give you 2496. NB at 13x will give you 2704.

 

[Random Murderer]

I broke it down a bit in case you want to determine your own values in the future.
notes: strap for RAM speed is in the form of speed/100, i.e. 1866 is 18.66 in my formula.
On AMD: FSB = 2(target RAM speed/strap), FSB = Target NB Speed/NB multiplier
Therefore: 2(target RAM speed/strap) x NB multi = Target NB speed
or Target NB speed / 2(target RAM speed/strap) = NB Multi

Example:
268 FSB. RAM at 1866 strap should give you 2500. NB at 10x will give you 2680
translates to:
2(2500/18.66) = 2680/10 = 268
2680 / 2(2500/18.66) = 10
It's just simple algebra.

 

[d1nky]

Ill write all that down.

im having trouble getting some of the higher FSBs to play ball, memtest with a lower FSB is fine with 2500+ ram. the 250fsb and above sets out memtest errors at the final stress test.

i got a feeling the IMC/CPUNB may be crapping out at 2750mhz and above

this is rock solid but not as high cpunb as i want (same as HT) http://valid.canardpc.com/2868111

 

[Random Murderer]

Ill write all that down.

im having trouble getting some of the higher FSBs to play ball, memtest with a lower FSB is fine with 2500+ ram. the 250fsb and above sets out memtest errors at the final stress test.

i got a feeling the IMC/CPUNB may be crapping out at 2750mhz and above

this is rock solid but not as high cpunb as i want (same as HT) http://valid.canardpc.com/2868111

That's a pretty good OC when you take into account RAM speed. I'd stabilize it there and be happy, but that's me

 

[Johan45]

I have had this chip to hell and back Dinky. I still can't get over 2800 on the NB but I'm not done with this piggy yet. I experiment all the time lately I've been doing testing with the HT over the NB . I figured that since that's the way it ships maybe they like it better that way. I'll fill ya in when I have some concrete results.

 

[Irony]

268 FSB. RAM at 1866 strap should give you 2500. NB at 10x will give you 2680.
250 FSB. RAM at 2000 strap should give you 2500. NB at 11x will give you 2750.
234 FSB. RAM at 2133 strap should give you 2495. NB at 12x will give you 2808.
208 FSB. RAM at 2400 strap should give you 2496. NB at 13x will give you 2704.

Take your pick.

I did a ton of maths like this for my 3820 overclock, so I have a table of formulas to refer to

I broke it down a bit in case you want to determine your own values in the future.
notes: strap for RAM speed is in the form of speed/100, i.e. 1866 is 18.66 in my formula.
On AMD: FSB = 2(target RAM speed/strap), FSB = Target NB Speed/NB multiplier
Therefore: 2(target RAM speed/strap) x NB multi = Target NB speed
or Target NB speed / 2(target RAM speed/strap) = NB Multi

Example:
268 FSB. RAM at 1866 strap should give you 2500. NB at 10x will give you 2680
translates to:
2(2500/18.66) = 2680/10 = 268
2680 / 2(2500/18.66) = 10
It's just simple algebra.

Thanks, lol. That's actually very helpful, I've been working on getting my NB and memory stable too. Seems to have issues with high FSB tho. (around 250)

 

[Durvelle27]

Going on a overclock quest when i fully finished my watercooling setup

 

[d1nky]

Going on a overclock quest when i fully finished my watercooling setup

it wont be that simple, youll finish the loop find a nice overclock, get bored upgrade the loop, test some new clocks and then get bored of it all then start over again.

ive sold my 8350, looking at a 9370 but they seem expensive for an overclocked vishera chip, and got a new loop planned out!

 

[RCoon]

it wont be that simple, youll finish the loop find a nice overclock, get bored upgrade the loop, test some new clocks and then get bored of it all then start over again.

ive sold my 8350, looking at a 9370 but they seem expensive for an overclocked vishera chip, and got a new loop planned out!

Just get another 8350? No vdroop, fresh chip! I wouldnt touch a 9xxx FX chip, when I can make one for £150 and a half hour overclocking.

 

[Durvelle27]

it wont be that simple, youll finish the loop find a nice overclock, get bored upgrade the loop, test some new clocks and then get bored of it all then start over again.

ive sold my 8350, looking at a 9370 but they seem expensive for an overclocked vishera chip, and got a new loop planned out!

lol so true but i would have keep that 8350. The FX 9000 series doesn't seem worth it

 

[Durvelle27]

What motherboard would you guys recommend. Must be Blue & Black

 

[d1nky]

this is interesting to people that struggle with high clocks on these chips. apparently from AMD.



AMD has validated the Crosshair V and Sabertooth 990FX as for use with its new FX 9590 and 9370 CPUs, however there is some advise we'd like to add for users upgrading (or even users running their FX-8350s at ~5GHz frequencies).

1) You MUST plug in the 8pin and 4pin CPU 12V power plugs: they are there for this kind of usage! A 5GHz FX CPU will certainly draw over the 300W limit on the 8pin cable. If your PSU has good OCT it will simply cut out and your system will suffer hard-reboots. If not, it will likely melt poorly constructed PSUs with cheap wiring under extensive stress, unless your PSU is specifically fitted with heavy-gauge (lower AUG rating) wiring.

2) Do not disable OCP if you're running 24/7, it will protect your CPU. If you're trying to run extreme voltage for benchmarking you will have to turn it off, but in that case we strongly recommend watercooling (or at least chilling) the VRMs.

3) As you'd expect, when pulling close to 400W the VRMs run hot. At a minimum active cooling from direct case airflow is therefore a must (and watch those temps). Still, we strongly recommend watercooling the VRMs (EK does a good block) and do NOT loop CPU into VRMs: create two loops. When you consider your loops take into account the heat you're trying to shift: we advise looking at >1 large radiators and/or even a chiller system is maybe worth considering if you're running several high-power items together.


found this on http://forums.vr-zone.com/hardware-depot/2884721-the-amd-fx-9590-fx-centurion-preview-6.html

 

[RCoon]

What motherboard would you guys recommend. Must be Blue & Black

GD65 or GD85