Troubles OCing c2q Yorkfield 9550

[rrundzans]

Hi everyone!

 

Just yesterday bought brand new cooler for my cpu, successfully replaced stock cooler, so i guess it is time to try some OCing : )

(@ idle its 40, load 60 now. i think it would be better if i would put thermal more carefully, and/or used standalone one (i used that came with cooler), but i am 99% sure tems are not an issue here)

 

So my system specs are:

mobo: Giga Byte GA-EP45T-DS3R (Supports DDR3 1900MHz)

http://www.gigabyte.com.tw/Products/Mother...?ProductID=2851

 

cpu: Intel Core 2 Quad Q9550, 2.83GHz, FSB1333, 12MB

ram: Kingston 2GB, DDRIII1600MHz, KIT OF 2, CL9 (= 4 modules)

psu: Chieftec 750W

cpu cooler: asus silent knight 2

 

Overall my system looks oc ready (1600Mhz ram, mobo supports 1900Mhz). However, i am failing OCing it bigtime..

 

At stock, it was 8.5 x 333 = (2830.5).

 

First things i did was lowered multiplier to 8 (fine cpu clock ratio: off). I increased voltages to both cpu and ram, so there will be enough juice if needed. I also fixed my rams timings to 9-9-9-24 (they climbed up automatically with fsb, i think it is unneccessary)). fixed pci bus to 100mhz also.

 

So i incresed fsb to 355 and got stable (primed & memtested) system = 355x8 = 2840Mhz system. However, if i try upping fsb more (to 366) it fails to start up OS. When i memtested it, LOTS of errs showed up.

I also tried to un-fix ram timings (to auto), no success eather.

 

I am sure i am missing something. Pls help guys .

 

My bios settings (@m.i.t page) are here (stable 355x8):

 

M.I.B first page:

http://not.justdied.com/pic/001/mit1.jpg

http://not.justdied.com/pic/001/mit2.jpg

http://not.justdied.com/pic/001/mit3.jpg

 

Adv timing control (left it as it was):

http://not.justdied.com/pic/001/atc1.jpg

http://not.justdied.com/pic/001/atc2.jpg

 

Adv clock control (made no changes here also):

http://not.justdied.com/pic/001/acc.jpg

 

Tnx in advance.

Edited March 6, 2010 by rrundzans

[Flibo]

Just in case, you could try to lower your memory clock frequency and see if it gives errors. Why would you drop your CPU multiplier? 8,5 is a blessing

[rrundzans]

Hmm..

It is ok to manually change mems freq? I thought it must be fsb x 4 for ddr3 rams.

[rrundzans]

Flibo

 

Tnx a lot. RAM truly was weak link.

 

I changed fsb:dram to 5:8 for now, and that prevents ram freq going above 1333 (stock freq). So for now on i am excluding ram out of equation.

Perhaps later i will try to find correct ram timings for higher freqs.