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Trouble overclocking Northbridge on amd fx 8150 - Page 2

post #11 of 26
Thread Starter 
Quote:
Originally Posted by almstsobur View Post

8150 @ 5Ghz. I have seen 8.23-8.25 Cinebench scores on any given run. between all NB and memory settings.

With my cpu at 4.3ghz (will overclock this higher later) and a 2600mhz nb i get a score of 6.76. With a nb speed of 2800mhz i get a score of 6.97.

Also just curious what is your fsb and multiplier set to and what is you vcore voltage along with what cooling solution?
post #12 of 26
Quote:
Originally Posted by cirwin2010 View Post

With my cpu at 4.3ghz (will overclock this higher later) and a 2600mhz nb i get a score of 6.76. With a nb speed of 2800mhz i get a score of 6.97.
Also just curious what is your fsb and multiplier set to and what is you vcore voltage along with what cooling solution?

UltimaXT block 1200LPH pump, 360 and 240 radiators 1.56V It's all in my signature. Not sure on your NB situation, mine was never stable at 2800 without stupid voltages, but again I gained next to nothing from 2600 to 2750. 2600 @ 25 x 200. I'm running the same board as you , as well.

250 X 20 2500NB, 2750HT 2000Mhz memory. < Current setup. though 25X 200 @ 2600HT 2600NB 1866 Mem is almost the same.
Edited by almstsobur - 3/2/12 at 1:51pm
post #13 of 26
Thread Starter 
Could you tell me if you know what voltage kept your cpu stable at 4.6 ghz? I have heard that 4.6 if easily achievable on air and even though i have the h80 liquid cooling loop it doesn't classify as liquid cooling so I am think 4.6 should be a good speed.
post #14 of 26
Quote:
Originally Posted by cirwin2010 View Post

Could you tell me if you know what voltage kept your cpu stable at 4.6 ghz? I have heard that 4.6 if easily achievable on air and even though i have the h80 liquid cooling loop it doesn't classify as liquid cooling so I am think 4.6 should be a good speed.

Sorry, no idea on that, and each chip is going to be a bit different. I got this chip based on 5Ghz hell or high water. I had to add the 360 radiator to my loop to make it happen, would throttle at 1.56V under full load with my previous setup of just the 240 Rad. Just up it a bit, get it going at 4.6, back off till stable, then up it one step. make sure temps are good along the way.

If I were to guess, I would say 23X200 1.43-1.46 ish is a good place to start for 4.6 watch temps though, these fuggers run HOT under 8 core load.
post #15 of 26
Thread Starter 
Ok thanks. Still confused about the northbridge because some reviewers who overclocked their chips in there reviews have been able to get higher northbridge speeds. I wonder If the bus speed needs to be higher in order to achieve those speeds because what i have been doing was keeping the bus at stock 200 but changing the nb multiplier to reach 2800.
post #16 of 26
Quote:
Originally Posted by cirwin2010 View Post

Ok thanks. Still confused about the northbridge because some reviewers who overclocked their chips in there reviews have been able to get higher northbridge speeds. I wonder If the bus speed needs to be higher in order to achieve those speeds because what i have been doing was keeping the bus at stock 200 but changing the nb multiplier to reach 2800.

If you bump the NB voltage to get higher NB you are adding heat to the CPU, the NB controller is part of the CPU. If you are hitting a thermal wall because of cooling you are much better off with a high CPU clock and higher CPU voltage then you are higher NB and higher NB voltage eating some of your thermal capacity. Understand what I'm saying? Shoot for your CPU OC first, then re-look at the NB situation. You may be seeing better gains because of the relatively low OC you are running.
post #17 of 26
Thread Starter 
I understand. Now my motherboard auto voltage adjusted my cpu-nb voltage to 1.45 at 2600mhz. To me that voltage seems to higher should i try to lower it?
post #18 of 26
Quote:
Originally Posted by cirwin2010 View Post

I understand. Now my motherboard auto voltage adjusted my cpu-nb voltage to 1.45 at 2600mhz. To me that voltage seems to higher should i try to lower it?

Yes, lower it, not sure why the sabertooth does that, but it does. You should be good at 1.30-1.35 for 2600 1.25-1.30 for 2400. but I would set it at 2400 for CPU OC'ing to ensure NB is not a stability issue. Then go back to 2600 when finished with CPU.
post #19 of 26
you guys forgot to list you memory clocks, NB overclocking is meanless with out knowing what memory speeds and timings you're running o.o!

I'm running 2400mhz too but it takes a really good chip to anything above 2600mhz I don't think I can reach 5.0ghz but I know I can reach 2800mhz NB. lose/win some.
    
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amd Phenom II x6 1090T gigabye UD7 990FX 5870 G.skill flare 2 x 4gbs 2000mhz  
Hard DriveCoolingOSMonitor
westerdigital cooler master eisberg 240L Vista 64 bit spceptre 1920 x 1200 
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CPUMotherboardGraphicsRAM
amd Phenom II x6 1090T gigabye UD7 990FX 5870 G.skill flare 2 x 4gbs 2000mhz  
Hard DriveCoolingOSMonitor
westerdigital cooler master eisberg 240L Vista 64 bit spceptre 1920 x 1200 
KeyboardPowerCaseMouse
muli-media ftw lol 1200 watt silverstone none another cheap one $20 
Mouse PadOther
none ATi 650 pro theater  
  hide details  
Reply
post #20 of 26
Quote:
Originally Posted by Demonkev666 View Post

you guys forgot to list you memory clocks, NB overclocking is meanless with out knowing what memory speeds and timings you're running o.o!
I'm running 2400mhz too but it takes a really good chip to anything above 2600mhz I don't think I can reach 5.0ghz but I know I can reach 2800mhz NB. lose/win some.

I've never really tried for 2800, like I said, tried 2750 and really saw no gains above 2600 the voltage is not worth the cooling overhead IMO. I'm running 7-8-7 24-42 @ 2000 Mhz or 7-7-7 @ 1866. 12.78GB's on Maxxmem #4 on the chart right now. Though it may be faster how I have it now, I was at 9-11-9 @ 2133 for the Maxxmem test.

http://www.overclock.net/t/1085742/amd-maxxmem-results-rankings/0_30
Edited by almstsobur - 3/2/12 at 3:37pm
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