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Cant overclock my q6600 over 3 ghz on p5w dh deluxe

4K views 59 replies 10 participants last post by  Aaron_Henderson 
#1 ·
hello
i managed to get a stable OC of my Q6600 at 9X333. I'm running 4X2gb Transcend 800mhz
when I try oc above 9X340 system won't boot.
I set voltage to 1.45 still no boot
is something wrong with my OC? what did i do wrong?
thanks
 
#2 ·
When you increase the FSB, you also increase the memory clock, make sure you adjust the memory clock so that the computer can boot. Also the north bridge voltage will most likely need to be increased to a voltage such as 1.25v-1.3v.

Also what power supply are you using?
 
#5 ·
Certain revisions of Q6600 were not great overclockers...G0 was better over B3. Can you share a CPU-Z screen please?
 
#7 ·
Quote:
Originally Posted by den0540i View Post

Here you go:
That is promising!

Quote:
Originally Posted by benjamen50 View Post

When you increase the FSB, you also increase the memory clock, make sure you adjust the memory clock so that the computer can boot. Also the north bridge voltage will most likely need to be increased to a voltage such as 1.25v-1.3v.

Also what power supply are you using?
On top of that, I would also increase the RAM voltage incrementally.
 
#9 ·
CPU: Intel Core 2 Quad Q6600 (Rev G0)
Ram: 4X2gb Transcend 800mhz (Probably 6-6-6-18 CAS timing)
Motherboard: ASUS P5W-DH deluxe
PSU: LC Power 420W
 
#12 ·
Wait... let me recap that one
tongue.gif


Q6600 = 2.4GHz @ 1066MHz so that means 9x266MHz FSB
Your RAM is 800MHz (so 400MHz)
Be sure to set it at 1:2 in BIOS (so that RAM speed is HALF of FSB speed. Do this while testing for higher CPU speeds to be sure the RAM is not the culprit. After you got a stable OC, you can start OC RAM again to higher MHz.

You run it at 333x9 = 3GHz
So 3.1GHz = 345MHz
3.2 = 355MHz
Etc...

Just recapping here for myself as it's been a while those Core 2 setups
smile.gif


I remember something as a FSB-wall with my board. So I could not go from 333 to 345 for some reason, but I could hit higher like 355. Might give that a try.

And you have 4 sticks... it's VERY stressy on the IMC. Try using only 2 sticks (of same slot colour) --> again, once you get a higher cpu OC you can put them back and work from their. 2 sticks is easier for the chipset than 4 sticks (when overclocking)
 
#13 ·
Quote:
Originally Posted by den0540i View Post

And also i don't know specs of ram. Could someone help me find voltage and timing.
Thanks
Use CPU-Z again, but look at Memory and SPD tab now
wink.gif


Also be sure to check every "Memory Slot Module" from the drop down list --> do this first with 4 sticks in and see if they all 4 are the same (part number etc)

Then remove 2 sticks as I posted before
 
#14 ·
Quote:
Originally Posted by ASUSfreak View Post

Wait... let me recap that one
tongue.gif


Q6600 = 2.4GHz @ 1066MHz so that means 9x266MHz FSB
Your RAM is 800MHz (so 400MHz)
Be sure to set it at 1:2 in BIOS (so that RAM speed is HALF of FSB speed. Do this while testing for higher CPU speeds to be sure the RAM is not the culprit. After you got a stable OC, you can start OC RAM again to higher MHz.

You run it at 333x9 = 3GHz
So 3.1GHz = 345MHz
3.2 = 355MHz
Etc...

Just recapping here for myself as it's been a while those Core 2 setups
smile.gif


I remember something as a FSB-wall with my board. So I could not go from 333 to 345 for some reason, but I could hit higher like 355. Might give that a try.

And you have 4 sticks... it's VERY stressy on the IMC. Try using only 2 sticks (of same slot colour) --> again, once you get a higher cpu OC you can put them back and work from their. 2 sticks is easier for the chipset than 4 sticks (when overclocking)
But I can't set ram clock lower than 500mhz.

And one more question. If ram stick says 800 mhz, is this 800 in bios or actual 800 (1600 in bios)?
Also I can't see the SPD tab in cpu-z, but I can see memory tab:


--> I removed 2 sticks of ram.
And also i don't want to overclock ram if possible.
Thanks
 
#16 ·
When you set the RAM clock in the BIOS, that is the actual speed. While in the operating system it will display as half speed in most hardware monitoring applications.
 
#18 ·
Quote:
Originally Posted by den0540i View Post

But I can't set ram clock lower than 500mhz.

And one more question. If ram stick says 800 mhz, is this 800 in bios or actual 800 (1600 in bios)?
Also I can't see the SPD tab in cpu-z, but I can see memory tab:


--> I removed 2 sticks of ram.
And also i don't want to overclock ram if possible.
Thanks
Q6600's FSB is rated at 266 MHz, however, in these quad cores the FSB is "quad pumped", so the effective bus speed between CPU and RAM is 4*266~1,066 MHz when not overclocked.

DDR2 are "doubly" pumped, so from a baseline of 400 MHz their frequency of operation goes to 800 MHz.

To achieve the best possible performance the "base" frequency of the CPU and RAM should have the same value or ratio 1:1.

In the first picture, when you set your CPU FSB at 333, you have a series of possible values for the RAM: 533 MHz for the RAM means that CPU to RAM ratio is 1 : 1.5, it's 1 : 1 if you choose 666 MHz as the RAM frequency, and so on.

Ideally, you'd want to achieve at least 400 MHz on the FSB, so that the RAM effective speed would be 800 MHz and the effective FSB will be 1,600 MHz. To achieve that, you need to play both on the CPU voltage core (it is not safe to go beyond 1.4v, if I remember correctly, and if you are air cooled) and the RAM voltage, as well as the RAM latencies (higher latencies allow for more overlock headroom).

edit: The effective CPU speed is found by multiplying the base FSB speed by the multiplier: 266 MHz * 9 ~ 2.4 GHz.
 
#19 ·
I also have one of these boards, and from what I can tell so far, it doesn't like going over 300 FSB very much. It originally only supported up to 1066 FSB CPU, later support for 1333/1600 was added, but I don't think those CPU are able to run at their stock speed. I can usually get most CPU to sit at or around 333 FSB...I haven't messed with it much yet though honestly. Just got a couple more CPU to try on it though, Q6700 and E5430. My bet is this chipset just doesn't do a very high FSB, even if the CPU is supported. I got the Q6700 based on the knowledge that I wanted as high of a multi as possible, which led to 1066 FSB CPU, and finally settled on Q6700. I think it was the fastest or second fastest 1066 CPU for the 775 socket. I just picked up the 1333 Xeon to try, but I don't expect it to run at it's stock speed...who knows though I guess. Long story short though, I don't think you'll get much farther on this board, unfortunately...even though it seems like it should be a higher end 775 board, the chipset just doesn't seem very good compared to some others on this socket.
 
#20 ·
I've hard a hard time trying to overclock the Intel Core 2 Quad Q6600 on a P5Q Deluxe (One of the best ASUS P5Q boards around). I could only get 3 GHz stable, any higher and it wouldn't be stable.
 
#21 ·
There are a series of factors that are preventing you from getting better results. One of the major culprits I believe is the power supply.

The LC Power 420W has a 12V rail rated at 15A, which won't probably cut it for your CPU. I've also seen people push their Q6600s well past 1.5V. IMHO you are going to need another power supply with a better amperage rating for the 12V rail.
 
#22 ·
hey, can you post a picture of the bios overclock settings, its been so long i need a little refresh.

i had a q6600 for quite a while running 3.6ghz on 1.4V (1.47 in bios) but mine was a 1.325 VID

can you chack what VID yours is? you can do check with core temp. ( dont use cpuz as it shows the current voltage used rather than the CPUs default voltage)
 
#24 ·
Quote:
Originally Posted by den0540i View Post

But I can't set ram clock lower than 500mhz.

And one more question. If ram stick says 800 mhz, is this 800 in bios or actual 800 (1600 in bios)?
Also I can't see the SPD tab in cpu-z, but I can see memory tab:


--> I removed 2 sticks of ram.
And also i don't want to overclock ram if possible.
Thanks
In your 2nd picture (SPD Tab) you selected RAM slot 2. Browse for RAM slot 1 and/or 2 and/or 3 and/or 4 by clicking on the black triangle next to the text "RAM slot 2"
 
#25 ·
My Q6700 arrived today, so if you want, I can try to help a bit more now. I am also going to swap my faulty X3210 in half an hour. When I get back from that, I am going to tear my P5W DH Deluxe down and redo thermal paste since it's never been done and it's an old board. I think I might remove some of the aesthetic bits attached to the heatsinks as well, and possibly add a small fan or two to the northbridge area. Then I am going to see how far I can get this chip. I can let you know how it goes and what settings exactly it takes to get there. The Q6700 is just a slightly higher multiplier Q6600, but overall FSB, after overclock, should end up about the same. I am still waiting on RAM to arrive as well, but I have some 800MHz RAM in it right now to test with, so that should work just fine for now. I have 8GB on the way though and that will be 4 slots, which might hinder the maximum FSB on this board. I'll post again later today/tonight and let you know how I made out.
 
#26 ·
Q6600 is thirsty for volts. When I OC them I usually feed them 1.4v to start with.

Then I set the multi for 8.

Then I set the FSB at 400 (which is 3.2ghz)

The ram is run 1:1, meaning it should be running at 800mhz total.

If this is stable, try upping northbridge voltage and attempting 9 multi for 3.6ghz.
 
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