OC Mystery........

T

ThePerformer

Limp Gawd
Joined
Jun 9, 2003
Messages
284
So I've been trying to stabilize my rig for a few days. Here's the situation:

I had it OCed to 2.8 (multiplier was 8x instead of 9x) and it seemed great. Except that my memory multiplier was much lower than the rated 1142MHz for my RAM. I was running CAS 4 at 800MHz but I wanted to up my memory speed.

So I switched to 5:4 and tweaked it to around 1142 and gave it 2.2V. I switched the CAS back to the rated 5.

So guess what? The system was unstable.

So I turned down the OC. Processor was now around 2.7GHz and the memory was around 1100MHz with 2.2V. The processor was getting 1.44V or so btw.

Unstable. Would crash during games.

So I keep turning it down. I can't find any stable area where my memory is above 800MHz EXCEPT when the processor is only at the rated 2.4GHz. Then the memory will run at 5:4 at around 1100MHz now.

So here's the deal:

-System is unstable when CPU is OCed and memory is above 800MHz but stable when at 800MHz (waaay under its rated speed)
-System is unstable when CPU is mildly OCed (2.5GHz even) and memory is at rated speed but stable when at CPU is at 2.4GHz and memory is at 1100MHz

So, normally it's pretty easy to tell if the CPU or the memory is what's unstable. But this is driving me nuts!! I can't figure out which one I need to turn up or down!

I got the system ALMOST stable at like 2.8GHz with 1100MHz. It would stay up for about an hour and then go down reliably. However, when I turned it down just a little bit, the symptom remained until the CPU was back to 2.4GHz.

I'm so confused. Help me guys! Thanks!
 
depends if he has the dominators with promo IC's... or D9's

check this thread out... OCF corsair guy explains all

The promo chips dont oc too well in comparison to the D9's
I have been reading and the ppl from corsair say that the promos respond great to voltage but i havent seen too many.. in that thread above you can exchage your sticks if you bought them thinking that they were D9 IC's
 
I have no clue if mine are promos or microns. How can I check?

Furthermore, mine isn't the part they are talking about. It's the very expensive 9146 memory.
 
Did you check latency?

I had similar problem except my memory is transcendt ddr2 800.

I run it on 1:1 and started to overclock FSB.

On around 3.3Ghz and memory at 700+ orthos failed and i realized it's ram.

In bios when automatic timing was set and ram downgraded than actual speed I found that it changed timings from 5 5 5 15 to 4 4 4 10..... I push it manualy on 5 5 5 16 so now my comp goes for 3.7Ghz and ram at 822 Mhz very stable.
 
try adjusting the Vdimm. It is odd though that you are unable to run the RAM at its rated speed. Are you sure that it isn't DDR1142 which would be 557mhz, that would explain why it wont run at 1142mhz lol.

I had some guy on another forum ask why his overclock wasn't stable with his RAM on a 1:1 divider and his FSB at 333mhz. He continued by saying that his memory was DDR333 and that he wanted to return his RAM because it wouldnt run at stock speeds...boy that one was hard to explain to him...lol. Just making sure you aren't making the same mistake lol...
 
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