Help with FSB please

[castrol]

Hi all just a short one that might help you, i have found that useing the green and purple memory slots you can run the memory at 400MHZ with 1T i was using the two green slot as stated in the handbook, but this made the memory run at 333MHZ and 2T so it looks like this is ok.

now for some help if you dont mind, i have burnt in for about 30 hours so have now started to up the FSB and volts but it seams when i go over a 300FSB this make the CPU run slower, i set the FSB to 300 x 9 = 2.7GHz all ok but when i set to 301 or above it reduces the FSB in windows using CPUZ i am reading 1.6GHZ with a FSB of 301 x 9 i have run sisoft to check this and the cpu is running a lot slower, i have then uped the FSB to 310-320-330 but this just makes the cpu run slower, do you think this is a bios problem or some kind of cpu protection.

anyway problem solved with the memory, just the FSB now.

I know this CPU and all outher hardwere i have can do 2.9 with the asus a8n32 motherboard as i have done this and benched tested for www.custompc.co.uk so i know it is none of my hardware but looks like there is a problem with this motherboard going over 300 with the FSB.

any help that you can give will be greatfull.
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[Peter]

Get rid of the word "FSB". There is no such thing in AMD64 architecture.

The frequency you're tweaking from 200 upward is the system reference clock. CPU core and HyperTransport bus multiply up from there.

And yes, most BIOSes have automatic failsafe procedures that reduce the CPU speed after a failed boot. You've gone too far.

 

[castrol]

Hi yes you are right but you know what i mean, like i have said i have very good system temps and have tried with both FX55 and opty165 with relaxed everthing and reduced multys of 9-8-7-6-5- but when you set the FSB above 300 it is a no go as this reduces the speed of the CPU.

any help please anyone.

 

[Peter]

Told you - it's probably a safety fallback because it wouldn't start at the settings you set.

 

[castrol]

It boots fine into windows with every setting, but anything above 300MHZ on the fsb and it reduces the speed of the cpu.

 

[Peter]

... very probably because the CPU simply won't run at the speed that'd produce at its native multiplier. Said that three times now.

 

[Old Hippie]

very probably because the CPU simply won't run at the speed that'd produce at its native multiplier. Said that three times now.

I wondered if I was missing something here.....I wasn't......the OP is.

 

[castrol]

So if the chip cannot run at above these speeds how is it that i got 323x9 with this chip using the ASUS A8N32 motherboard?

What i am asking is why has this MSI K8N diamond motherboard got a problem going over 300MHZ on the FSB?

 

[Peter]

Overclocking headroom is always in the combination of EVERYTHING in a particular build. This is YMMV territory, there ain't no guarantee that even the exact same setup is going to produce anywhere near the same overclockability.

Anyway, you are WAY off any sense of reality if you think a component that doesn't go more than 50% over its advertized speed has a "problem".

And I'll say it again: There is no FSB.

You've hit this system's overclock ceiling. Get over it.

 

[castrol]

I know that the AMD chips use HT insted of FSB, why i am refuring to FSB is that is what is shown on the motherboard to increase the speed of the chip and memory. and for your information i have just recived an email from MSI saying that they are awear of this problem and are making a bios update to fix this problem.

They would not make a motherboard with voltage settings on of 1.4v + 0.75v for the CPU and 4.1v for the memory and a FSB of 450 if all it could do was 300MHZ on the FSB.

Yes i agree with you CHIPS have there limitation and this is normaly found out by BSOD or failed boot, but never have i seen a system reduce the FSB on its own when booting into an operating system.

BUt thank you anyway for all your coments.

 

[TheRyuu]

Originally posted by: castrol
I know that the AMD chips use HT insted of FSB, why i am refuring to FSB is that is what is shown on the motherboard to increase the speed of the chip and memory. and for your information i have just recived an email from MSI saying that they are awear of this problem and are making a bios update to fix this problem.

They would not make a motherboard with voltage settings on of 1.4v + 0.75v for the CPU and 4.1v for the memory and a FSB of 450 if all it could do was 300MHZ on the FSB.

Yes i agree with you CHIPS have there limitation and this is normaly found out by BSOD or failed boot, but never have i seen a system reduce the FSB on its own when booting into an operating system.

BUt thank you anyway for all your coments.

320mhz on HTT is very realistic given the right circumstances. I think that I've read (not really sure) that it is a bios issue and that your going to have to wait for an update. Now that I've read your last post it seems you contacted MSI (good job).

Anyway, to make sure MSI aint lying about the bios update. From your sig, you got WC? Well then, crank up that vcore to 1.5v and let it rip. If it still fails to boot above 300mhz AND you have a divider on the memory, then I'd say it's a bios issue.

Remember safe voltages:
CPU vcore don't go above ~1.5v, 1.525 is ok, but thats pretty much too much for me
Memory if your memory is TCCD's then anything above 3v really won't help. And thats what it probably is.

Chipset and any other voltages I wouldn't really mess with that stuff. But if your experienced enough and know what your doing then I guess if your going for the world record on an OC to mess with that stuff. But me being an "avid" gamer and OCer, I want a stable and non-paranioa OC, so I don't mess with those voltages.

And as the other guy said, with OCing, YMMV