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Northbridge Frequency?

post #1 of 15
6/18/09 at 1:03pm
Thread Starter 
I just got my Phenom II(I loves it) yesterday, and a lot of the OCing options are looking pretty foreign to me after using a AM2 Brisbane.

One that I can't see to figure out is "Northbridge Frequency" it has Multipliers from 5x-25x. What does it do exactly? I looked in my mobo manual, and nothing was there. I have it on auto right now, and I assume that whats holding me back overclock wise, since I can't seem gain any OCing ground.


Also what does Hypertransport do? + Rep for anyone who can clue me in.
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post #2 of 15
6/18/09 at 1:12pm
your nb freq is of course your nb clock, for you, if you are using an am3 board, it should be default 2000mhz runnin at 10x multiplier times the reference clock of 200mhz. i personally leave the nb the way it is, but if you want to you can try to oc it, and also, bumping up the CPU-NB VID voltage a bit can help stabilize clocks, the hypertransport runs along side the nb clock really, if you arent doing fsb clocking but rather cpu multiplier ocing, i wouldnt touch this so it can save the pita for some other time.

also ht is the speed the parts especially the ram speaks to the cpu and cpu to nb and etc...

you should be able to get it to run at around 2400mhz for your NB clock. with a 12x multi and a bumped voltage for the CPU-NB VID and the general NB Volts. thus forcing your ht clock to go up unless you down the multi for that.
Edited by bucdan - 6/18/09 at 1:15pm
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post #3 of 15
6/18/09 at 1:23pm
Quote:
you should be able to get it to run at around 2400mhz for your NB clock. with a 12x multi and a bumped voltage for the CPU-NB VID and the general NB Volts. thus forcing your ht clock to go up unless you down the multi for that.
If you do overclock using the base clock then your NB and HT speed will increase. Ive found that getting my NB over has given me the biggest overall performance boost but this does raise the HT speed but dropping this down a Multi will help with stability.

Also it depends on whether you are overclocking by increasing the base clock or the CPU multi.
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post #4 of 15
6/18/09 at 1:24pm
Thread Starter 
Quote:
Originally Posted by bucdan View Post
your nb freq is of course your nb clock, for you, if you are using an am3 board, it should be default 2000mhz runnin at 10x multiplier times the reference clock of 200mhz. i personally leave the nb the way it is, but if you want to you can try to oc it, and also, bumping up the CPU-NB VID voltage a bit can help stabilize clocks, the hypertransport runs along side the nb clock really, if you arent doing fsb clocking but rather cpu multiplier ocing, i wouldnt touch this so it can save the pita for some other time.

also ht is the speed the parts especially the ram speaks to the cpu and cpu to nb and etc...

you should be able to get it to run at around 2400mhz for your NB clock. with a 12x multi and a bumped voltage for the CPU-NB VID and the general NB Volts. thus forcing your ht clock to go up unless you down the multi for that.

Alright....that makes sense! Rep for you!

I'll try a NB volt increase to stabilize my clocks next time.
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post #5 of 15
6/18/09 at 1:41pm
Quote:
I'll try a NB volt increase to stabilize my clocks next time.
Just watch the temps when you start to increase the CPU-NB VID & NB voltage as that is when I noticed a rather big increase in temps
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post #6 of 15
6/18/09 at 2:42pm
Wait - so a bump to the NB VID can make an OC attempt on the 720 BE more stable? Even if that OC is just using the multiplier?
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post #7 of 15
6/18/09 at 2:44pm
That's how it works with Intel (usually), so I assume it'd be the same for AMD.

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post #8 of 15
6/18/09 at 3:26pm
Higher NB frequency will give you better performance. Like the guys said you may need more voltage but generally speaking too high NB will create instability due to higher voltage/heat. I can run up to about 2600 on NB with 1.3V on NB/CPU setting in my bios.

Hypertransport(just to finish) will give you better bandwith but no noticable performance increase.
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post #9 of 15
6/18/09 at 3:31pm
Quote:
Originally Posted by SupahSpankeh View Post
Wait - so a bump to the NB VID can make an OC attempt on the 720 BE more stable? Even if that OC is just using the multiplier?

It really depends on many things. Your motherboard and the chipset has most to do with voltages. I know guys who can run 1.4V or more with stock chipset cooling but I cannot come so close. There are many variables but try to raise it see what happens. Some need to run low and some can run up to 3000 on NB.

Aftermarket chipset coolers will cool the NB and allow you to run higher voltages resulting in higher NB frequency and most probably a better overclock. I was reading Logans real nice info and it seems he may be on to something. One thing for sure, you will see better performance with a Highr NB frequency.

When you raise the HTT, you also overclock NB, Hypertransport and Ram frequency.
Edited by jimibgood - 6/18/09 at 3:36pm
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post #10 of 15
2/20/11 at 10:34am
Hello guys I tried to increase my NB clock from 2000mhz (auto) to 3200mhz.Then DOS asked if i want to apply changes, i chose Yes.So then all shut down, only led was working and also all fans , but no display and no HDD activity.Afterward i was pretty scared - I removed all plugins and then removed BATtery from motherboard for a minute .Afterward i installed the battery back in its place and then it worked again with auto clock(2000mhz).

Please tell me what was wrong - voltage?Or chipset doesnt support to increase clock?
My motherboard is Gigabyte with AMD 740 G chipset, CPU is 3,2GHz phenom II x2 .

Thanks for all answers
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