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post #19781 of 28750
I honestly don't have a lot of experience stressing my NB. My mobo locks my NB multi at 9 but allows my HT multi to be ajusted to 11 or 12x. However the HT can not clock higher then the NB or you will default the HT to the same multi as your NB. At least this tends to be the case on my mobo. The only way I am able to get my NB up in the 2200+ area is to overclock the heck out of my FSB and I have not been very successfull at doing that w/this combo of mobo/cpu/ram w/any clocks over 3550MHz. I have an Nvidia Chipset designed for 3way SLI w/an option to run a 4th Physx card. Most AMD mobo's like yours have the 790FX NB and 750 SB that allows you to obtain much better/higher clocks then I will ever dream of and for this reason alone I don't think I can give you any real valuable information as to how to obtain and stablize your NB overclocks.

I wish you luck in that dept. One word of caustion. Don't go raising your Voltages to much on your NB. You may end up doing more damage then good in a hurry if you know what I mean.
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post #19782 of 28750
Quote:
Originally Posted by shortfuse View Post
since theres lessovertimeat work i decided to rework my old opteron 148 lower OC
Shortfuse, memory timings look great. What set of DDR-550 memory are you running? Model number? You certainly have more room to play with.

Quote:
Originally Posted by BlackOmega View Post
when stressing the NB do you just do it the same way as you would the CPU?
BlackOmega, are you referring to the NB Frequency (IMC) or the motherboard chipset? I guess you could call it "NB"...still not sure why it's listed in the bios as that. To answer your question yes you can test the chipset (HT Clock speed) the same way as you would with your cpu OC. Orthos, Occt, Prime 95 ect will work perfectly fine. I always ran OCCT when testing for the maximum speed of my board.

Hope that helps

EDIT: For the NB Frequency you can still run the same stress testing applications. Lower the HT Clock speed (multiplier) and memory divider. That way you rule out those components and don't have to worry about them. Can you list every single setting that you're running right now? Frequency and voltage would be helpful.
Edited by thlnk3r - 10/28/09 at 11:03pm
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post #19783 of 28750
Quote:
Originally Posted by thlnk3r View Post
Shortfuse, memory timings look great. What set of DDR-550 memory are you running? Model number? You certainly have more room to play with.



BlackOmega, are you referring to the NB Frequency (IMC) or the motherboard chipset? I guess you could call it "NB"...still not sure why it's listed in the bios as that. To answer your question yes you can test the chipset (HT Clock speed) the same way as you would with your cpu OC. Orthos, Occt, Prime 95 ect will work perfectly fine. I always ran OCCT when testing for the maximum speed of my board.

Hope that helps

EDIT: For the NB Frequency you can still run the same stress testing applications. Lower the HT Clock speed (multiplier) and memory divider. That way you rule out those components and don't have to worry about them. Can you list every single setting that you're running right now?
I surely can..


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post #19784 of 28750
BlackOmega, thanks for the screen shot. Bump the NB Multiplier and start testing. Anything from stock to about 3.4Ghz and I would give it a small bump in cpu-nb voltage (+.100). I'd say anything over 3.4Ghz and 2400Mhz NB give it +.200. All though it my range for your 720BE. I'm going off some numbers recommended for 550BE owners (with four cores unlocked).

Recommended is a LOW CAS with a high NB Freq....this is highly recommended from Tator. This will give you some nice results in Everest's memory benchmark app. I'm assuming 8-8-8-24 are the factory stock timings?

Good luck
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post #19785 of 28750
Quote:
Originally Posted by thlnk3r View Post
BlackOmega, thanks for the screen shot. Bump the NB Multiplier and start testing. Anything from stock to about 3.4Ghz and I would give it a small bump in cpu-nb voltage (+.100). I'd say anything over 3.4Ghz and 2400Mhz NB give it +.200. All though it my range for your 720BE. I'm going off some numbers recommended for 550BE owners (with four cores unlocked).

Recommended is a LOW CAS with a high NB Freq....this is highly recommended from Tator. This will give you some nice results in Everest's memory benchmark app. I'm assuming 8-8-8-24 are the factory stock timings?

Good luck
Thanks for that thlnk3r, imaginary rep.

Yeah stock timings for 1866 is 8-8-8-24, so at 1333 I'm hoping I can run some nicer timings like 5-5-5-15.

Ok I'll see what happens.
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post #19786 of 28750
Quote:
Originally Posted by BlackOmega View Post
Yeah stock timings for 1866 is 8-8-8-24, so at 1333 I'm hoping I can run some nicer timings like 5-5-5-15.
BlackOmega, cas 6 seems a little bit more reasonable...I'm not sure about 5

Keep us posted!
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post #19787 of 28750
Quote:
Originally Posted by thlnk3r View Post
Shortfuse, memory timings look great. What set of DDR-550 memory are you running? Model number? You certainly have more room to play with.


its my old skool g.skillz F1-4400DSU2 yeah i know i can clock higher with this 2.97mhz was the stable i can go with.

bad experience with DFI mobo since nf3 series. never liked it. over priced when the rest of the boards can do the same..
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post #19788 of 28750
My SLI DR allowed my Corsair XMS Plat's to hit some pretty unheard of timings on the memory. I was very pleased
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post #19789 of 28750
@BlackOmega
Cas 5 is going to be near impossible for DDR3 Sticks, I have yet to see any DDR3 sticks clock that low. DDR3 1066 is Cas 7 by standards. And great DDR3 1333mhz sticks are Cas 6 by standards.

Though, depending on the sticks, you can get 1333mhz-1550mhz with Cas 6 no problem. And if you do have the Micron GTS's like we talked about earlier, then you should be solid for that range.

As for Stressing your Northbridge, Run a Memory only benchmark/stress test. And then a CPU Stressing test.
As a CPU-NB Overclock can fail in many ways. It might be able to hold the RAM at it's current settings, but it could fail to communicate with the CPU properly.

CPU-NB Overclocking is probably the hardest part of AM3 as it leaves a difficult road for anyone trying to get the max amount of speed out of there CPU they can as you need to find a perfect balance for all parts.

I would do as Thlnk3r said, (but with added Tator Flare) Crank your CPU-NB Voltage to 1.4, then crank the multi up till your board will not post, or you run out of multi. Which ever comes first. And when you find a max posting/windows frequency, stress test it.

After that, keep the CPU-NB v @ 1.4 and Raise your RAM speed to 1600mhz, try Cas 7-6-6-24-1T. If it holds stable I wouldn't worry about trying to go higher than that.

At that point, you know your CPU is going to top out around 3700mhz for you. So use your HT Clock to set your RAM & NB to the fastest they can go. Then use your unlocked multi to get your CPU to it's high point.

Side Note: Do you have a picture of your IHS, the last set of numbers could tell me how high you will be able to get your NB.
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post #19790 of 28750
Quote:
Originally Posted by Tator Tot View Post
@BlackOmega
Cas 5 is going to be near impossible for DDR3 Sticks, I have yet to see any DDR3 sticks clock that low. DDR3 1066 is Cas 7 by standards. And great DDR3 1333mhz sticks are Cas 6 by standards.

Though, depending on the sticks, you can get 1333mhz-1550mhz with Cas 6 no problem. And if you do have the Micron GTS's like we talked about earlier, then you should be solid for that range.

As for Stressing your Northbridge, Run a Memory only benchmark/stress test. And then a CPU Stressing test.
As a CPU-NB Overclock can fail in many ways. It might be able to hold the RAM at it's current settings, but it could fail to communicate with the CPU properly.

CPU-NB Overclocking is probably the hardest part of AM3 as it leaves a difficult road for anyone trying to get the max amount of speed out of there CPU they can as you need to find a perfect balance for all parts.

I would do as Thlnk3r said, (but with added Tator Flare) Crank your CPU-NB Voltage to 1.4, then crank the multi up till your board will not post, or you run out of multi. Which ever comes first. And when you find a max posting/windows frequency, stress test it.

After that, keep the CPU-NB v @ 1.4 and Raise your RAM speed to 1600mhz, try Cas 7-6-6-24-1T. If it holds stable I wouldn't worry about trying to go higher than that.

At that point, you know your CPU is going to top out around 3700mhz for you. So use your HT Clock to set your RAM & NB to the fastest they can go. Then use your unlocked multi to get your CPU to it's high point.

Side Note: Do you have a picture of your IHS, the last set of numbers could tell me how high you will be able to get your NB.
Thanks for that Tator. Lots of very useful info. Do you ever actually raise the NB voltage? So far I have both the NB and the CPU-NB set @ 1.25v. Since last night I've been actually raising the NB clock by raising the HTT. So far it's @ 2250 sans issue.

I suppose I'll try the multiplier route to find it's absolute max.

I had this fleeting idea that if I raise everything using the HTT rather than individually changing multipliers that the system as a whole would 1. be more stable and 2. be "faster" clock for clock rather than going the multiplier route.

Also, is there any benefit to throughput (or anything else for that matter) to having the HT link >2000MHz? And if there is no noticeable benefit what is the max that I'd want the HT link to be?

BTW: The stepping for my 720 is CACZC AC 0910APCW (I'm assuming that's the set of numbers you were referring to).


Thanks Tator you've been a great help.
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