Need help with F3-16000CL9T-6GBTD kit!

[yenclas]

Any help ?

[jstanthr]

got 6-7-6-20 / 1600 stable now, took a little more voltage but nothing too crazy running 1.65vdimm and +.125 on qpi. being watercooled helps a little too i think, gonna try out my old PA120.4 tec rad soon, hopefully that should keep me around ambient at load and maybe -5 -10 ambient at idle. thats if it works at all, it did on my old c2q rig, i don't see why it wouldn't on the i7 the TDP is less on the i7 anyway (i think)

[Big Elf]

Malus - I have the same motherboard, CPU and RAM. Running at 4.2GHz with 1.26v and RAM at 2005MHz requires a QPI of 1.60v (DRAM voltage also 1.60v). Even 1600MHz requires a high QPI. I'm still experimenting but it's over 1.5v at least.

[GSKILL TECH]

Big Elf is correct, generally DDR3-2000 requires 1.60V on the QPI/VTT for X58 platforms

Thank you
GSKILL SUPPORT

[jagger333]

something tells me running 1.6v+ qpi isn't going to be good for your cpu..

gskill tech, can you please share a stable setting for 1600 6-7-6-18? i'm at 1.4v qpi right now @ 1600 8-8-8-24 but would like tighter timing

[Big Elf]

jagger333 - I was initially concerned about QPI levels over 1.35v so I raised the question with Asus and Intel. I also followed the postings on here and around the web on running RAM at 2000MHz. Asus advised that keeping the QPI under 1.65v was OK with my motherboard and although Intel didn't say the same thing in quite so many words they did say the following:

'Since Intel does not support overclocking, there is no information regarding this matter. The default value is 1.150V, any value above the default will override the factory settings, running your processor out of specifications (overclocking).

Bear in mind that the QPI/uncore voltage is not the same as the Vccp or VID voltage of your processor. The VID voltage range for Intel(R) Core(TM) i7 Processor I7-920 is from 0.80V up to 1.375V. The QPI/uncore voltage is by default 1.150V.

Apparently your motherboard auto adjusts all the settings every time that you modify the memory speed. Adjusting the appropriate QPI voltage and memory voltage. If your motherboard manufacture told you that the settings are fine and the performance of your system is stable, you can keep running those settings.'

There's been enough time now with people running high QPIs for problems to have surfaced. As none appear to have done so it looks as though it's not a problem.

Running high QPIs does, particularly with HT enabled, increase the general CPU temperatures quite a bit though.

[GSKILL TECH]

jagger33,

Simply lower the timings to that. Try 7-7-7-21 and see if that works. If so, try 6-7-6-18, but it may need slightly more than 1.40V for the QPI/VTT so simply increase that to stabilize.

Big Elf,

Good post. Especially with aftermarket motherboards, they are made to handle higher temps and voltages for overclocks. Many times this can also be the difference between an expensive motherboard and a cheaper one. If you take the ASUS Rampage II Extreme for example, it is made to handle much higher voltages than many lower priced motherboards. For the P6TD, and older P6T motherboards, 1.65V and below has never been an issue. Although it is running on the higher end, as long as you make sure CPU and NB temps are not over heating, everything should be fine. Most people don't have a problem, but if you plan on running load 247 for video editing or something, then you will want to be aware of sufficient cooling.

As you increase memory frequency and memory voltage, this can all increase CPU temperatures as it places more stress on the memory controller embedded in the CPU.

You will notice this particularly when going from DDR3-1600 to DDR3-2000.

Thank you
GSKILL SUPPORT

[jstanthr]

the c0 stepping i7-920's could take up to 1.6 as long as you had great cooling, but the d0 stepping models don't like anything over 1.45 in my experience

[Big Elf]

jstanthr - What, in your experience, happens over 1.45v?

[jstanthr]

i'm reffering to the qpi voltage, in my experience when i went past 1.45 it caused my memory to become unstable and start throwing more errors, when i backed it down back below that it smoothed back out, but that may just be a quirk with my evga e760 3x classified board.

[yenclas]

Finally I buy a new kit and work without problems at 1600Mhz 6 7 6 18 1T

The problem is If i can justify that my old kit is faulty if I can run them at 1600 8 8 8 22 with 1,6vdimm or 2000 at 9 9 9 24 at 1,66vdimm ?????????

[jagger333]

i've always had problems with the memory. after half a year, i finally got around to do some testing. Previously i cannot at all post 2000 mhz no matter what dram, qpi volts i had and i had errors in 1600 in cl 6,7, and ok with cl 8 but my compuer reboots randomly(IRQ_NOT_EQUAL)..

yesterday i tested the memory individually and found one faulty stick out of three(it works but constant errors). after pulling out the faulty stick, i was able to run 1600 7-7-7-21, 6-7-6-18, and 2000 9-9-9-27 (1.64v dram 1.5v qpi) easily with no errors. i feel i can even run tighter timing at 2000 if i play around a little more.

so if you can't run at rated speed or even 1600, test the memory individually to see if you have any faulty sticks.