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noob getting nowhere overclocking e6750

Last response: in Overclocking
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October 20, 2008 8:52:37 AM

hi all

I'm a complete noobie when it comes to overclocking. I have a rig with a e6750 cpu, a Gigabyte GA-P35-DS3P rev1.0 motherboard, and 4x 1GB Corsair XMS2 DDR2-800 mhz( rated timmings are 4-4-4-12) dual channel RAM.

So i read the overclock guide on this forum for C2Q and C2D, and fought I had it figured out(turns out I was wrong).

trying to do some overclocking i did the following:

turn off virtualization technlogy, C1E, etc except for TM2
turn off C.I.A2
set the performance enhancement setting to Standard(possible options are : standard, turbo, extreme)
set voltage control to auto
set PCI-Express freq to 100Mhz
set memory timmings to manual and lax to 5-5-5-18(incase my mem ain't that good)
set fsb to 400mhz(up from 333mhz)
set spd to 2( giving a dual channel memory of 800mhz)

now the system boots to the point where it performs the memory test at which point it halt's for some time and then reboots with old settings.

then tried setting the fsb to 350mhz (with spd to 2 giving a dual channel memory of 700mhz)
but with same results. :cry: 

normally i run my mem at 800mhz 4-4-4-12 so I don't think they are to blame (of course I could be wrong about this)

if some of you have any pointers on what's wrong, it would appreciate it
October 20, 2008 9:42:57 AM

Enter your voltages manually. Whats your cpu's VID?
October 20, 2008 9:44:16 AM

Memory divider should be 1:1. Is that the spd?
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October 20, 2008 9:53:46 AM

my VID is 1.35000V
i believe the a SPD of 2 is the same as a ratio of 1:1

as a host frequency of 400mhz results in a dual channel mem freq of 800mhz (the same as the rated speed of my memory)
October 20, 2008 9:56:06 AM

I run a 6750 overclocked to a modest 3ghz on a ga-p35-ds3l board - it will go to 3.2ghz with no voltage increase to cpu. However i found on my board that the default voltage for the memory was not correct and had to up the voltage by 0.3v.So i would check your ddr voltage is actually correct,look on memory or check with supplier then see what your board sets it to.If it is correct and you are overclocking it it may need a slight increase in voltage.
Leave pci-express frequency alone( to start with). (I set my fsb to 375).
October 20, 2008 10:53:58 AM

You don't need to double the mhz, so to speak, its done automatically. Put the spd on 1, try boot and if it works check out CPUZ if its correck ie. Ddr2-800 dual channel. GL
October 21, 2008 7:07:22 PM

a SPD of 2 is the lowest i can choose, and results in DDR2-800 mhz speed, if the fsb is set to 400 mhz. mean while i have, to my surprise, found out that setting the pci-e bus speed to 100Mhz instead of auto results, in the system only successfully passing the post approximately 1 every 10 times, with all other settings set to the optimized defaults. now just changing it to auto makes it post succesfully every time. i'm puzzled by this since 100mhz is suppose to be the standard pci-e bus speed right?

anybody have any ideas ?
!