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Trouble overclocking Northbridge on amd fx 8150

post #1 of 26
Thread Starter 
First let me just post my hardware specs.

amd 8150 4.3ghz 1.356v
8gb ddr3 partiot division 2 viper xtreme 1866mhz
asus 990fx sabertooth
msi gtx 580 lightning
h80 cpu cooler
850w psu

I just recently got the amd 8150 cpu and did a moderate overclock on stock voltage with a vrm adjustment. I bumped up the multiplier to achieve this clock speed. I then bumped up the ram to its rated 1866 speed from 1600. I then upped the speed on my northbridge and ht link to both 2600mhz. On my old phenom ii the max northbridge speed i was able to achieve was 2600 any higher the system would not boot into windows. It is to my understanding that the new cpus can reach speeds higher than 2600 easily but when i tried 2800mhz the system would boot up but would be unstable when stress testing. I left the cpu-nb voltage at auto which turned up the voltage to 1.45 when i reached my stable 2600mhz speed but to me this voltage seems too high but i am not sure.

Could someone tell me what i should try because everytime i increase the nb speed my system becomes faster in benchmarking and in memory intensive games like battlefield 3.
post #2 of 26
2600 or a little over seems to be max for these CPU's on NB without stupid voltage, HT you can get to 3000+. The good news is; it doesn't really matter, NB gains above 2400 are very minimal.
post #3 of 26
Thread Starter 
Really? The HT is limited to 2600 on my motherboard and by increasing my northbridge to 2400 to 2600 the performance gain was pretty significant. I even did a benchmark at 2800 even though it was not very stable and my performance still got an increase.
post #4 of 26
keep your mem at 1866, see if you can tighten your timings and run NB at 2400/2600 and HT at 2600-2800 and that should be about as good as it gets. try a 230'ish or 250 FSB to get the HT higher than 2600.
post #5 of 26
Quote:
Originally Posted by cirwin2010 View Post

Really? The HT is limited to 2600 on my motherboard and by increasing my northbridge to 2400 to 2600 the performance gain was pretty significant. I even did a benchmark at 2800 even though it was not very stable and my performance still got an increase.

You may see a bit of an improvement on mem speed tests from 2400 to 2600, real world gains though, very minimal. Also it begins to cap out pretty quickly. I saw no gains at 2750 NB.
post #6 of 26
I got better gains on memory speed benches going to 2000Mhz or 2133Mhx on my memory than I did going above 2500 on the NB, though those gains were also minimal in reality.
post #7 of 26
Thread Starter 
well you say that but for example in bf3 on all ultra settings with msaa off and motion blur off at 2200mhz nb I was getting about 65 fps. When i overclocked my nb to 2600mhz I now run at 70-85 fps
post #8 of 26
Quote:
Originally Posted by cirwin2010 View Post

well you say that but for example in bf3 on all ultra settings with msaa off and motion blur off at 2200mhz nb I was getting about 65 fps. When i overclocked my nb to 2600mhz I now run at 70-85 fps

Likely the conditions of the game or map at the given moment. Use something consistent to test, 3Dmark, Furmark Etc. I've gone over these settings 6000 times tweaking my personal setup and gained next to nothing except a couple points in MaxMemm from anything above 2500NB.
post #9 of 26
Thread Starter 
Well in cinebench i get higher scores with each nb speed increase. What cpu do you have exactly?
post #10 of 26
Quote:
Originally Posted by cirwin2010 View Post

Well in cinebench i get higher scores with each nb speed increase. What cpu do you have exactly?

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