System Voltages

G

grumpyboy

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Jun 6, 2007
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Hi thanks for reading the the post.
Ive just Overclocked my e6600 to 3200 mhz by adding ddr2 800mhz.
And setting System Clock to 400 mhz with a x8 mulitplier. With 1:1 memory/system clock ratio.

Im using a zalman CNPS9500 cooler.

Ive my idle temp is 39 c and 60c under full load.

I think this is a bit hot so I checked my V Core and out it is 1.41 ive heard 1.35 is the highest you should set it?

However my System Voltage Control (Auto) is turned on in my BIOS
Im a bit scared to turn off system voltage control
since I dont understand the other settings.

DDR over voltage control (values range from 0.25 v to 0.47 v)
PCI-E over voltage control (values range from 0.5 v to 0.47 v)
MCH Over voltage control (values range from 0.05 v to 0.75 v)
FSB Over Voltage Control ( values range from 0.5 v to 0.35 v)

Any ideas?
 
on air cooling i highly suggest you not to go over 1.5v, also you temperature seems to be fine as long as it does not pass 65-70c. Moreover, do not leave the CPU Voltages on auto.
 
Man I really need to reseat my 9500... my system idles at 59-60 degrees...no telling what its getting up to when Im gaming. At least its stable...
 
I agree, temps are fine, just go in an manually set the CPU voltage to 1.40 or the next notch over.

Its all a personal thing, Intel datasheet (Should be considered the same as a message from God ) specifies that 1.55V is the absolute maximum Vcore. I don't like running much over 1.4V, others run higher all the time, its your stuff.

However you are right around the 1.4V and that is not alarming at all, I don't get concerned until around 1.45V but thats me and I am very conservative. Day to Day I run 1.375V but thats my CPU and yours might need the extra, only by testing can you find out.

The proper way to do it is to set it to 1.4 or slightly higher and test with Orthos or other stress software and then drop the CPU voltage down a notch (whatever the next lowest setting the bios will allow) and retest for stability, rinse and repeat until you get errors, then kick it back up a notch. Then use the heck out of the machine, long gaming session etc .etc. whatever. If no issues (freezes BSOD) you are golden, if a problem, kick voltage up a notch, rinse and repeat until the machine is stable. The idea is to test until you find the LOWEST CPU voltage that will reliably sustain stability for the way you use your machine. (No one plays Orthos for long, its boring as hell )

Duh I guess i should attempt to answer the unasked question.


The only one you have to be careful with is the CPU voltage as it will let you set ridiculous values that could harm the CPU but you already know what the limits are from above. The CPU voltage setting is different that the ones below, with the CPU voltage what you set is what you get. Just keep it reasonable per above.


The default DDR (Vdimm or memory voltage) is 1.8V for P965 boards and it looks like you have a Gigabyte board.
All the voltage settings below are adjustments (additions to the defaults) so what you are setting is additional voltage from the baseline defaults.

For example if you put +.1 in the DDR voltage control you will be setting your memory to run at the default of 1.8V +.1 = 1.9V

DDR over voltage control (values range from 0.25 v to 0.47 v) This is your memory voltage, typically not more than +.3 (total 2.1V)
PCI-E over voltage control (values range from 0.5 v to 0.47 v) We are not certain what this is put probally the PCIE section of the MCH
MCH Over voltage control (values range from 0.05 v to 0.75 v) Memory Controller Hub aka Northbridge give it +.1V for stability
FSB Over Voltage Control ( values range from 0.5 v to 0.35 v) We are not certain what this is give it +.05 for stability.


You must look at the rams manufacturers specs for proper voltage settings, Most high performance ram have a recommended range, for example my ram is 1.8 - 2.1v. As you ram is not OC you want to stay at the low side but if you decide to really push it (see my sig) you would want to be on the high side and as long as you stay in the recommended range you are covered by warranty.

Nice OC thats the perfect sweet spot and it would be worth seeing if you can get a little more out of it as your ram is not yet even overclocked. You can probally get another 25MHz of FSB before your memory comes into play requiring more voltage or loosening of timings. You did not mention your ram details but I would also consider setting it manually to the upper range of what the manuf recommends for your exact ram module if you attempt to OC more. If it was rated for 1.8 to 2.1 Volts I would manually set it to 1.9V with your current 8x 400 setting just for a bit of extra stability, If you do attempt to get the extra 25MHz FSB I would raise it to 2.0Volts and find a copy of memtest.


OC guide for P965 Gigabytes.
http://www.hardforum.com/showthread.php?p=1030795318
 
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