Asus P5W DH Deluxe Motherboard - Can't OVerclock!

[Smithy83]

Hi,

I have spent a fortune on my PC and still cannot overclock!

I have an Asus P5w DH Deluxe Motherboard
Intel Quad Core Q6600 2.4ghz
A fully watercooled case with CPU waterblock
8GB of Corsair Dominator Memory, 2.1v, 5-5-5-15, PC2-8500
Windows 7 64bit

The problems have gone back over a year, I initially had OCZ memory, a matched pair of sticks which where 4GB and PC2-6400. The problem i had is the RAM would never detect at PC2-6400, and setting it to this speed manually made me get "system overvoltage or overclock failed"

I gave up and bought the Corsair memory and windows 7 etc to go with it. At first i bought 4GB set and managed to get the cpu speed (think its FSB) to 301, this gave me 2.7GHZ and the PC was stable and reported as PC2-8500. However, simply going into the bios and setting the ram to PC2-8500 again caused "system overvoltage or overclock failed". The ram will never detect itselft as being 8500, it always reported as 5300 unless o overclocked.

Now i have bought another 4GB of exactly the same RAM, and i cannot get the FSB speed about 275! if i do, windows blue screens or i get "system overvoltage or overclock failed".

Can anyone help me, i have spent a fortune on a watercooled case etc and havent been able to get above 2.7ghz! im not back to 2.4GHz at the moment!

I also have updated to the latest bios, made no difference.

Thanks

[TheGlasMan]

It is always harder to over clock 4 sticks then 2. Try using a memory divider.

[Smithy83]

Originally Posted by TheGlasMan

It is always harder to over clock 4 sticks then 2. Try using a memory divider.

Forgive me, whats a memory divider?

[Smithy83]

i used one of the motherboards pre set overclock settings and it hs given me 3.0GHZ thats stable, but the bios thinks the memory is PC2-5300, does this matter?

i downloaded CPU-Z and it says:

DRAM Frequency 416.4 MHZ
FSBRAM 4:5

[TheGlasMan]

The MB setting implemented the memory divider (FSB 5:4 DRAM) with the resulting speed DDR2 833 bandwidth @6600. If you continue to bump the FSB the memory speed will increase at that ratio.
Shouldn't effect the performance much with the large caches of the C2D.

[Smithy83]

When i try to do it all manually though the system wont boot.

Using the preset profile, that got me 3.0ghz, but only PC2-5300

Can anyone give me a list of settings to try?

Also i cannot find how to change the 4:5 ratio setting, i cant see it anywhere in the bios, i can only find how to change the cpu multiplier from 6-9?

[TheGlasMan]

I'm going to move this thread to the ASUS forum, as they know the motherboard and the ASUS bios. Hope you guys can help Smithy out.
http://forums.pcper.com/forumdisplay.php?f=62

[TheGlasMan]

Any help here? How would our friend unlock the OC parts of his bios??

[Smithy83]

Hi,

i have been playing about with voltages etc all night, i can not get a stable boot.

it only seems stable if i choose the preset profile which gives me 3.0ghz but the ram is only reported as PC2-5300 in the bios!

trying to things manually, however small the overclock is, results in a blue screen when booting or failure to POST

[cuke2u]

Hi, a long but excellent guide here http://www.xtremesystems.org/forums/...d.php?t=110193
Chris

[Smithy83]

can a faulty psu cause the issues i have?

its a thermaltake 700w one, was quite expensive at the time but could it be faulty?

[Smithy83]

what confuses me is if i dont do any overclocking and just say my RAM is PC2-8500, the system wont boot!

did exactly the same when i had DDR2 6400 memory, i select the correct speed then i get nothing!

[cuke2u]

Hi, you might have to up the memory voltage to what the manufacturers state, also some dividers might not work...
Chris