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Trying to get stable. AM2 4800+ Brisbane

post #1 of 13
Thread Starter 
ehhhhhhhhhhay! Been a while since I posted anything in this forums.

Dont pay attention to the sig thats my old system.

Here is what I have now.
AM2 4800+ Brisbane 65w 65nm (forgot to write the stepping down before installing)
Biostar A700 A+ (a decent budget board)
Gskill DDR2 800 2x1g running at 2t with 5-5-5-15 (horrible timings, but I couldnt find anything too much better with DDR2 800)
X800XT (irrelevant, but might as well mention it)

ok so all I am trying to to do is get this sucker stable at 2.8. So far I have managed to get it Prime95 (blend) stable for about two hours at that speed, but I need at least 6 hour stability before I call it done.

Here is what things are set to right now.

-FSB at 225,
-Multiplier at 12.5
-DDR set to 800, but only shows as 400 (800ddr) in CPUZ when FSB is at 225, otherwise its at 375 (750 ddr).
-HT link is a little high, set at 1125mhz, (which could be the source of my instability)
Vcore is at 1.280.


I dont think the Vcore is the problem, so I am going to try playing with the Dram and HT dividers, untill then anyone else got any advice? Take a look at the screen shot.

Edited by TheProfiteer - 6/21/08 at 1:33pm
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post #2 of 13
put HT multiplyer to 4x or maybe 3x.
1.35 would be safe volts for it.
or maybe ram voltage up .1 if you haven't tried that.
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post #3 of 13
Hey, its good to see that someone else was away for a long time and then returned. Welcome back.
Yea, the Vcore looks a little low. The stock Vcore is 1.35v for the 65w X2's (well it is on my 4600+), so i'd try bumping that up a bit first, although like you said, it could be the HT link. FYI i had mine up at 2850 on stock (1.35v) and it was stable for the 45 minutes that I was willing to let it run on stock cooling.
post #4 of 13
Thread Starter 
I am going to run the prime 95 Blend test at these settings (check the attachment of my desktop image)

Any advice would be very appreciated.
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post #5 of 13
Thread Starter 
^^^^Weird I couldnt get past 11 minutes on prime with those settings.

Difference in initial settings were.

Raised CPU Vcore from 1.28 to 1.35
Lowered HT link to 4x
and raised Ram Voltage from 1.95 to 2.05

I want to be able to OC this a little and not give up like I did with my previous chip which was a 939, 3800+ Venice Single Core. I couldnt get it more than 3 hours prime stable at 2.6, which is whack, thats only a 200mhz increase.

advice? Anyone?
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post #6 of 13
Thread Starter 
So when things get technical no body has anything to say?

I have managed to get 3.5 hours of stability using the settings bellow, I stopped it my self so it could of gone longer.

Multiplier left at 12.5 and fsb=225
Dram Set at 800 and 2t
Vcore at 1.35
HT link x4 which at 225=900mhz

My question is, is it better to gain 300mhz of CPU speed, and loose 100mhz of HT, and not be able to run in 1t mode,
OR
stay at stock speed of 2.5ghz and have a 1ghz HT, and be able to run my ram at 1t?
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post #7 of 13
In your screen shot in both CPUZ and speedfan it showed your Vcore as 1.31v... is that what it was set at in BIOS at that point?

According to what I hear, most of the time the performance difference between full speed HTT and HTT down 100MHz is negligible, and the performance difference between ram at 1T or 2T command mode is pretty small too. so I'd say to go with the higher clock speed, but you could always try running a couple of benches to compare the two (even something simple like superPi). Unfortunately I dont have any actual data to back this up right now (way to tired to look it up), but it would be interesting to have some actual data behind the "hearsay".
post #8 of 13
in AMD overclocking, CPU MHZ is the king, HT link speed doesn't play a .5% of a major role. ^ ^ so yeas, go for the cpu mhz increase and lower ur HT link to 4x or 3x but you should be able to do fine with just 4x anyway. and also sometimes you might just need to tinker with ur RAM settings a bit too inorder to get that stability touch. and also i believe ddr2 ram's are supposed to be in 2t and lastly when oc'ing you'd tend to avoid from using half multipliers, only use whole ones instead. so use the highest default multipler for the cpu and bump the FSB away.
Edited by elito - 6/22/08 at 10:09am
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post #9 of 13
Thread Starter 
Well it seems that for some reason my motherboard down clocks my ram at stock speeds.

But I have good news, I was able to get 10hours stable, at 225fsb, which put my CPU at 2.8+/- a few mhz. my Ram right at 400mhz (800mhz ddr) and my HT link at 900mhz. All at 1.35Vcore, and highest load temp was 41*c this is all on stock cooling.

for a 59 dollar chip, I am very satisfied =).


oh for the last 2 hours I ran one instance of Prime 95, and one instance of Superpi calculating 32m, it took 29 min for superpi to finish, so I ran it about 4 times.
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post #10 of 13
you should be able to get 2.8ghz stable on stock vcore (1.35v) and to get higher you'll need to pump 1.45v into it...

Every Brisbane I have had will do 2.8ghz at 1.25v with the right ram and 3Gs with 1.35v but with problem ram you can add .1v to that...

I have all of my rigs doing 3Gs plus with 1.45v...I just set vcore at that and clock it till it stops... the 5000BE will do 3.4ghz on that...the others need 1.5v to get that high..
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