Overclocking 1090T

[Chrisoldinho]

Morning all,

I have been the owner of a 1090T Black Edition for approximately 1 year, and recently decided to overclock it.

Before overclocking I made sure I had read various forums and threads regarding the Phenom II CPU's and what a typical overclock looked like, I also made sure I had a decent cooler & motherboard (see sig for full setup).

Initially I went with a straight 20.0x Multiplier and hit 4.0 no problem (1.476 vcore), I was even able to leave C1E & CnQ enabled, and everything on auto.
I then moved on to CPU/NB speeds, and hit 3000, again no problem (1.35 NB), I locked the HT at 2000, and moved the DRAM to 1600 (up from 1333, set voltage to 1.65). The system was stable in Prime95, and has been stable for several weeks after for day-day usage, which is great.

Over the weekend I decided to see if there was any more room in the CPU, I disabled CnQ and C1E & CPU spread spectrum and began.

20.5x multiplier failed with BSOD, even when running 1.5 on the vcore, so I switched to FSB overclocking, after fettling for several hours I could hit:-

4085 in BIOS (4097 in CPU-Z) at 19.0 Multi and 215 FSB (1.481 vcore). Everything seems stable, except I had to adjust the NB down to 27xx (can't recall the exact number right now), if I adjust the FSB any higher or go over this clock speed I get BSOD's and lockups.

My question is quite simple really, is it better to go for all out clock speed, before thinking about NB speeds? I had to lower the NB by over 300 and reading various threads increased NB speeds can give a nice real world performance bump, and whilst 85Mhz on each core is good if all cores are in use, at a core level it's not even a 2.5% increase from 4.0, and I am having to up the vcore again, and disable several power saving features along the way to hit this.

I am also slightly surprised that I was able to hit 4.0 so easily with such an easy overclock and yet I can only push it 85Mhz beyond that before falling off a cliff in terms of stability and temperature, I was perhaps naively expecting to hit near 4.2, which would have been a very nice improvement.

Thanks for any advice / comments.
Chris.

 

[humbug]

CPU-NB? yes, that alone can yield as much as 10% Floating Point performance.

Adjusting the FSB <- Intel terminology Given that you have an Intergrated Memory Controler it's actualy the (HT Clock) just to be pedantic
When you ajust it up it will also ajust your Memory speed up along with it, so you could be running 1700Mhz or more which is a prime suspect for instability, if you can only ajust the multiplier.

The Phenom II x6 1090T (Thuban) is a very good chip in todays increasingly multithreaded App's, if i do say so my self


4.1Ghz is a good clock, but your volts (while not to high) are at the limit for 24/7, 1.5v vCore is about the max of what the chip can tolarate day in day out, i would have thought your temps would be quite high with proper strees testing at that depending on the quality of the cilicone and your cooler.

55c on the cores and 68c on the socket sensor is the safe limit for Thuban's

I'm away from my own rig right now but will be back later on today, i will have some pretty pics for you and some more detailed advice then.

 

[trickynickyuk]

this is some info i got from OCUK

Try using CPU ratio 18x and changing the CPU Bus Frequency to 223 and see if that helps with stability.

You could try lowering the CPU voltage to 1.425v and change the CPU/NB Voltage to 1.300v.