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i7-950 Overclock problems

post #1 of 10
Thread Starter 
I have a new PC which was ordered, and delivered overclocked. I had occasional problems with the 2 monitors staying black after booting, but mostly things were OK, until a few days back when the PC would not boot any more. I spent 2 days trying to solve this, but finally had to admit defeat and reinstall Windows 7 (64-bit).

Now I have finished, the PC is back to auto clock at 3.06GHz. The manufacturers gave these figures to reset the clock to 3.8GHz, as delivered:

CPU RATIO: 19
BCLK FREQ: 200
DRAM: 2005 MHz
UCLK: auto
CPU VOL: 1.3
QPI/DRAM: auto
DRAM BUS: 1.65
HYPER THREADING: enabled
SPEEDSTEP: disabled


Actually, I set the CPU ratio to 18 to get 3.6GHz and tried 1.60 for the DRAM BUS - a reasonable overclock (no?). But on leaving the BIOS - nothing - the monitors stayed black, though the PC was on. I had to turn off the power and restart - when I got 'overclock failed' notices during boot. I pressed F2 to reset the clock to Auto mode.
Any reason why I can't get a stable clock? Advice appreciated. The other hardware is:

Asus P6X58D-E M/B
6GB KINGSTON HYPER-X T1 TRI-DDR3 2000MHz, X.M.P
1280MB NVIDIA GEFORCE GTX470
(TITAN FENRIR EVO EXTREME COOLER)

(Do I need to set to XMP mode in the BIOS btw?),

Thanks,

Martin
post #2 of 10
Try back your ram down from 2005Mhz to the next one down and see if that helps, Also the 18 multi isn't recommended as the odd multi's seem to work better for high OC's.
post #3 of 10
Thread Starter 
I'll try ASAP. How about 17 for CPU? Would other settings stay the same? Thanks.
post #4 of 10
Quote:
Originally Posted by martinlest;11717180 
I have a new PC which was ordered, and delivered overclocked. I had occasional problems with the 2 monitors staying black after booting, but mostly things were OK, until a few days back when the PC would not boot any more. I spent 2 days trying to solve this, but finally had to admit defeat and reinstall Windows 7 (64-bit).

Now I have finished, the PC is back to auto clock at 3.06GHz. The manufacturers gave these figures to reset the clock to 3.8GHz, as delivered:

CPU RATIO: 19
BCLK FREQ: 200
DRAM: 2005 MHz
UCLK: auto
CPU VOL: 1.3
QPI/DRAM: auto
DRAM BUS: 1.65
HYPER THREADING: enabled
SPEEDSTEP: disabled


Actually, I set the CPU ratio to 18 to get 3.6GHz and tried 1.60 for the DRAM BUS - a reasonable overclock (no?). But on leaving the BIOS - nothing - the monitors stayed black, though the PC was on. I had to turn off the power and restart - when I got 'overclock failed' notices during boot. I pressed F2 to reset the clock to Auto mode.
Any reason why I can't get a stable clock? Advice appreciated. The other hardware is:

Asus P6X58D-E M/B
6GB KINGSTON HYPER-X T1 TRI-DDR3 2000MHz, X.M.P
1280MB NVIDIA GEFORCE GTX470
(TITAN FENRIR EVO EXTREME COOLER)

(Do I need to set to XMP mode in the BIOS btw?),

Thanks,

Martin

Hi,

Try setting your ram to spec for it as to timmings and voltage.
Try setting your Multi to 21 for OC.

What are the timing and voltage specs for the ram?
Might have to loosen timing but unless heavy OC shouldn't be
a problem.

As you get further along you will have to go manual on most of your
settings and voltages.

Research;)

later:D
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post #5 of 10
If you're trying to run your ram at 2000mhz with 1.6v on the Dram then I suggest you loosen the timings by quite a bit. I'd go for 1.65v on 2000mhz and set it to 9-11-9-27 to start with. If that works then try 9-10-9-24, or if it doesn't try 10-11-10-27.

As far as I know that ram is stock rated at 1.65v for 2000mhz at 9-10-9-27. So it could require more voltage on the QPI and or Dram when you overclock your CPU.

In the past when my PC wouldn't POST properly I would generally blame my Ram settings. Changing them generally got rid of the problem.

A notch down would be 1600mhz if I am correct. At those clocks you would be able to run it at the stock timings with 1.6v (that is, if the stock timings aren't supertight).

Make sure your QPI voltage is within range too. Anywhere from 1.3 to 1.4 could be a solution.
Edited by MasterFire - 12/20/10 at 1:57pm
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post #6 of 10
For me, I would not try the XMP mode. I just completed a new build for my daughter using the P6X58D-E and the i7 950 CPU. I have a template for the BIOS settings using the 19x200 multiplier. If you want it.....pm me. But as others have suggested, I would drop the RAM to 1600mhz.
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post #7 of 10
Thread Starter 
Hi, thanks for the replies.

I should have said that although there are quite a few areas that I would say I am 'expert' in when it comes to PCs - overclocking is not one of them!! I don't know what the figures "9-11-9-27" mean for instance, or what a "19x200 multiplier" is (so not sure if I would like it or not, but thanks for the offer!). Sorry!

When I go into the BIOS I can alter voltages, DRAM values etc. but they are all simple figures - I choose 2000MHz or 1603 MHz, or I choose 1.6V or 1.5V and so on, as per my original post. (I get a warning at 1.65V that Intel says that over 1.65v can destroy the CPU: is it safe??).

I will try changing the 2000MHz to 1600 and see how I get on meanwhile,

M.
post #8 of 10
you set them in the dram timings in the bios. use your motherboard manual to find out where this is. It's usually in the overclocking section of the bios. 19 is the cpu multiplier and 200 is the blck. You have to set your overclocking to manual in the bios to access these. You will also probably have to take your cpu/ram ratio from sync to manual.

Once you set everything to manual there will be a setting for DRAM timings. Under this setting you can put in the timings that the above poster suggested. there will also be a DRAM frequency setting and I would definitely take the advice here and set that down to 1600mhz. You're not getting much of a performance boost from 2000mhz anyway.
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post #9 of 10
Quote:
Originally Posted by martinlest;11726190 
I don't know what the figures "9-11-9-27" mean for instance

Different latencies and timings for your RAM modules. These can be configured in the BIOS and generally should be set to what the manufacturer rated them. The lower the better (faster).
Quote:
or what a "19x200 multiplier" is (so not sure if I would like it or not, but thanks for the offer!). Sorry!

19x200 just means a multiplier (or "CPU ratio") of 19x and a base clock (or "BLCK") of 200. Multiply the two and you get your clock speed. (In that case, 3,800MHz)

edit: beaten.
Edited by Plex - 12/21/10 at 8:08am
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post #10 of 10
Thread Starter 
Thanks for the replies so far. I still have a few questions - I don't want to mess this up and burn something out, especially as a novice at this!

To set 19x200 I need to set Ai OC Tuner to 'Manual', no? Or else I don't get the option to change the BLCK Frequency. I think that must be a 'yes' answer! The memory modules are xmp but best not to set xmp option you say (I prefer to play things safe here)?

When I set the DRAM Frequency to 1603MHz, I have the option of keeping the current DRAM voltage setting, or to increase the DRAM voltage setting automatically "if your DIMMs require higher voltage". Which one do I go for - again playing safe: I'd rather lose a few fps in games than damage something of course!).

From what I've read elsewhere, I should disable speedstep, no?

When I set DRAM Bus Voltage to 1.65 I get a warning that according to Intel, DIMMs with settings over 1.65 may permanently damage the CPU. What is a safe setting here, given my other inputs?

Finally, I have the Asus EPU-6 Engine installed - is it OK after overclocking to leave the setting at 'Auto'? That turns the fans down etc. when I am not using Flight Simulator etc.

I'm exiting the BIOS without making changes until I hear back. Thanks folks!

Martin
Edited by martinlest - 12/21/10 at 9:51am
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