AMD HT and NB frequency

[Imasundaj]

Hi Everyone,

Recently I decided I want a little more bang out of my system, so I got to overclocking it. However I have some issues. Here's the full story:



System specs:

ASUS M5A99X EVO R2.0
AMD FX-6300
2x4 GB Corsair RAM (CMZ8GX3M2A1600C8)
ASUS R9280X-DC2-3GD5
with an 850 watt PSU

Original settings:

Default CPU frequencies. (3500 MHz target clock, with 4100 MHz turbo)
NB and HT link speeds auto detected to 2000 MHz by the mobo.
RAM is set to 1600 MHz D.O.C.P. profile.

What I did:

Set the turbo frequency to be the target frequency.
Set the HT and NB speed to 2600 MHz.
Disabled AMD Turbo in the BIOS.
Left everything else as it was, I did not want to change the voltage, I let the mobo decide what is best.

All is fine, everyday use is a little faster, MaxxMEM2 gives 9.5 GB/s on the RAM speed.
The only trouble is that Prime95 gives the ILLEGAL SUMOUT error after around half an hour.

I started to change the settings, and I think that the problem is either the HT or the NB speed. However if I set them back to the auto detected values, MaxxMEM2 gives only 7.5 GB/s speed on the RAM. Which is a huge pile of smelly bits.

So here I am, the machine works fine, Crysis is running great, played for an hour or more, without any problem, not even a hiccup. I'm using the computer every day, without any problem. Gaming, watching movies, listening to music, some MS Office things, watching Youtube, checking facebook, etc. The only problem is Prime95.

I read on the internet that more voltage can cure this problem. However I'm not sure I want to change it manually. And I also don't want the system to always run at 4.1 GHz. When the system is not used, I want it to settle down to 1.4 as it always does.

Thank you for any help.

 

[FlanK3r]

Im not friendly to the PRIME95, specially not at FX and motherboards VRM.
Did you tried another stability test as OCCT or AMD Stability test (in AMD OVerdrive software)?
Still, the ebst stability is daily using, if you have not issues with BSOD or so, its better than 10hours in PRIME OK and issues in practice PC work
For 2600 MHz CPUNB CPU need around 1.25 to 1.4V, depends at quality of chip.

 

[Imasundaj]

Thanks very much for the reply.

I haven't tried any other software. Will do sometime.
No BSOD at all. Gaming and other daily usage is totally fine.
The voltage is auto regulated by the motherboard, it never gives the CPU more than 1.26
I think I'll need to tweak that somehow.

Thanks again.

Edit:
I set the offset voltage in the BIOS to give the CPU 1.30 volts, and it passed the prime95 test. But doing this made the CPU a lot hotter. So now I'm trying to find the sweet spot, but it takes prime95 a lot of time to run so it's a tedious process.

Thanks again FlanK3r for the tip. It really was the voltage that was too low.