First of all i want to over clock my Core 2 Quad Q9400
I've got a stable clock of 3.1ghz But when i try to bump it up to 3.2. It wont even manage to get past post!
MOBO: ASUS P5N-E SLI
MEM : Corsair XMS2
GFX : nVidia GTX 460
PSU : Corsaid TX 650W (maybe 600 i can't remember)
I have a good cooler, and case. The CPU idles about 33-35 and under 90% load it'll reach about 45-50 which is fine for me!
My current FSB and MEM frequencys are
FSB: 1550 / 4 = 387.5 This equals to 3.1 GHZ
MEM : 920Mhz
vCore Voltage: 1.38 etc
First of all i am fairly new to overclocking! And the reason for me to overclock is to get rid of the bottleneck it has on my gpu. On bad company 2 It's like 90% etc and with BF3 BETA Casbian Border it's also bottlenecking. I know this as on Metro GPU usage is near 100 etc while cpu usage is like 70% etc
So please help me with this!!
I have looked at guides.. But to be honest. I struggle with those.
Thanks in advanced.
P.S. a reasionable overclock for me would be up to 3.5GHZ if that's achievable. Or maybe even 3.66GHZ which will be 1GHZ over the stock 2.66GHZ
See standard jedec at cpu-z your ram, if you drop ratio to 1:1 and set auto it will show 4-4-4-15, maybe those setting not stable loosen timming at 5-5-5-20 also incerase voltage ram max at 2.0v (ddr2)
Is your ram ran at 1:1 / @400mhz ? You must overclock slowly don't be hurry, disabled all feature cstate/c3/eist etc
. And raise step by step, also do test with intelburntest for fast test, if you stop oc.
No it's not. i the ram unlinked with the FSB. This is because the FSB is all the CPU's linked. so it shows it as 1333MHz (333 x 4 [stock]) leading towards a Ratio of 1:1 would cause the ram to OC to 1333MHZ. Ill try overclocking again tomorrow. will try to get it stable on 3.1 first. then 3.15.. 3.2. etc. and then will try to get to a max overclock
Basic vocabulary (especially dealing with nVidia chipsets ):
Definition time (attention purists, I'm talking about DDR2 and I'm simplifying a little ):
Core2 CPU's use a frontside bus (FSB). The FSB is a thing with two main characteristics: speed which is usually defined in MHz and width which in the Core2's is 64 bits wide. We are concerned with the speed.
Using the Q6600 as an example, the FSB frequency is 266 MHz. The matching DDR2 memory clock for that frequency is 533 MHz (266 X 2). DDR2 memory transfers two chunks of data for each bus cycle, hence double the frequency. So, to run 1:1 at an FSB of 266 MHz, we need DDR2-533 RAM. What CPUZ does is a little confusing. It will tell you that the memory frequency is 266 MHz for a 1:1 ratio.
The FSB clock is 1066 MHz (266 X 4). The bus is "quad pumped". It transfers 4 chunks of data into and out of the CPU each cycle. So each FSB cycle generates 4 FSB clocks.
Now, if you increase the FSB frequency to 333 MHz (or for a Q9400), the corresponding memory clock is 667 MHz and the FSB clock is 1333 MHz. The mem clock is not quadrupled, only doubled.
Ah i see. that's some good infomation. thanks But to get a Z (400mhz FSB) I should just keep my ram modules at stock 800MHZ? like you said it's only doubles. not quadrupled like the fsb on my q9400. Hmm.. I'm not sure if that will work if im honest. but i will try later on. But at an fsb of 1580 mhz (395mhz) the system locks up. i have tried up to 420 just incase the 395fsb was a 'bad clock' but to no avail.. it wouldn't past post!
So your saying i keep the RAM on default clocks (800) and keep the Voltage and the Timmings also on default. Although i will 'force' default and actually set the voltage and timmings to their values without leaving them on auto. is there anything else i should know about to get a stable clock of 3.2?