oc my cpu for me :)

Ch3m1c4L · 8 Jul 2009 at 08:57

spec in sig.
When only running 4gb (2 sticks) I can get my cpu to run in 1:1 linked and synced mode at 1600mhz (effective fsb) purely by putting my cpu voltage up to around 1.3 (vid 1.25, early stepping).

Stick in 2 sticks more of ram and it caused my oc to be unstable, fair enough. I have tried more core voltage. (no more than 1.35) ppl set up at 1.7 and vtt at 1.5, ram has been tried at 1.8 and 1.9 and slackening off the timings. NB runs at 1.3 happily, but i tried it at up to 1.56, SB normally running at 1,5 and tried it up to 1.65.

CPU temps are high 30s, to low 40's under full load for 30 minutes. mobo temps are high (60-70 on NB and 65-75 on SB), but im waiting on some adaptors so i can actualy fit the NB into my loop, without having to rebuild the whole machine if i went to replace the stock blocks on it.

I am assuming it is unstable because of the heat on the NB or SB
, but i just want to check incase im missing something. I am running bios 1104. The only other issue i have with the system is that if its been off for a long time (overnight) when i first try to boot it i get a usb init error, which i have to reset the system and then it tells me "post failed", cause of me resetting the system. I go into bios, save values and it cycles and works fine....Which im not too annoyed at as i cba to unplug my usb devices (2.5" HDD, G5 rev 2 and G15 rev 2)

Ch3m1c4L · 9 Jul 2009 at 14:07

no one has any insights to offer?

HazardO · 9 Jul 2009 at 14:30

It's unstable when you use 4 sticks of ram instead of 2 because the memory controller can't cope with 4 sticks of DDR3 1600 when overclocked (Or you have a bad stick or slot). Try underclocking the RAM and see if it gets more stable.

Ch3m1c4L · 9 Jul 2009 at 14:42

its stable at 1600mhz on the ram, its only when i push the fsb of the cpu to 400 that it becomes unstable. The RAM and slots are fine, memtested and played on for months (had 3 faulty sticks originally).

so, with cpu at stock (333fsb), and ram manually set at 1.78v (1.8 actual) 9.9.9.24 1t 1600mhz it is 100% stable with 4 sticks in it, put the cpu fsb up to 400mhz and it is unstable. If i only have 2 sticks of ram in it, then the cpu is stable with a simple volt increase.

Its pointless me lowering the speed of my ram to up my cpu speed, since i only want to oc my cpu to get it in 1:1 linked and synced with my ram at 1600 lol

Venares · 9 Jul 2009 at 15:07

You need more Volts on your northbridge I suspect.
Try notching it up one or two spots and see how you do.

HazardO · 9 Jul 2009 at 15:22

If you are pushing the FSB from 333 -> 400, when you've got the RAM set to 1600, you may be pushing the RAM up to 1921MHz. The FSB controls the CPU and memory speeds.

Venares · 9 Jul 2009 at 15:26

Good point there too Hazard.
As Hazard has sugested, you may also be running the memory too fast.
Best thing to do while trying to find your OC is to drop the memory multipier to rule it out.

Ch3m1c4L · 9 Jul 2009 at 16:54

have you read my post, i change it from unlinked where i have the cpu fsb at 333, and the ram running effective 1600mhz, to linked and synced where both are running at 1600mhz.

I can achieve the cpu overclock when i only have 2 sticks in, with 4 sticks in the ram still runs happily at 1600mhz, but my cpu wont oc to 1600 mhx anymore. In my op i state"NB runs at 1.3 happily, but i tried it at up to 1.56"

edit: 1.3 is the lowest i can set it, and it runs cu at stock and ram at 1600mhz fine. the 1.56 was to test with the cpu at 400 fsb. I tried all the volts in my op, one at a time, as in. Up NB volt, up PLL volt etc, but didnt turn any off until i had tried them all up at the same time.