problems i7 @ 4ghz with 12GB Memory

McstylisT

McstylisT

McstylisT

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Hi all ,


Basically just ordered and installed another extra 6GB of the Corsair XMS3 12800 1600mhz 9-9-9-24 2T 1.5-1.65v memory. This takes me upto 12GB now.

However i have experienced many problems. I was currently at 4ghz Stable with only the 6GB. When the 12GB was installed it would seem to load and then blue screen , but it was too quick to see an error code. It would then restart.

I tried many things all to no avail.
I changed the voltages to the CPU , from 1.23 to 1.275 , i upped the ram itself to from 1.65 - 1.69. This helped but did not allow me to boot into windows at my attempted and normal 4ghz.

I've been trying to change every related setting in the bios ( to a safe standard ) , all to no avail.
The system is really hard to over clock now. It did not boot correctly with anything other than stock settings at first.
I have now successfully booted @ 153blck , voltage at auto and memory @ 1.69v. This is the current highest i can stably go.

Any help or information appreciated. I know what im doing on computers , but not an expert. Please be patient.

Componets in system :

i7 920 D0 CPU
12GB Corsair DDR3 12800 1600 - 9-9-9-24 1.5-1.65v
DFI Lanparty JR T3H6 X58 Micro Atx
Toughpower 850w PSU
ATI 4870

Any other info needed please ask.

Thanks in advance

McstylisT
 
Hi Mate,

Worth being aware that Overclockers specifically mention on thier overclocked bundles that running 12Gb RAM compared to 6Gb can have a negative affect on the overclock and I guess you are finding the same issue with your setup.

As to how to work round it, I guess reducing your overclock may be the only way to fix it. I'm sure the OCUK overclocking gurus have tried and I guess failed to get 12Gb working reliably at that overclock?

E-I
 
The problem is that the i7 memory controller is not rated to run memory at 1600mhz and 12GB puts a lot more stress on it.
 
Hi ,

Thanks to those that replied.

The reason i went 12GB without a concern is i have met and seen many people who run 4ghz+ with 12GB ram @ 1600mhz. I must admit many do not use the DFI boards , but i know its a quality board.

Im now wondering if lowering my mem speed to say 1333mhz will help me achieve my 4ghz clock. What do you guys think ?

I would like those who have 12GB memory to let me know what settings they used and if any problems were incurred and how you corrected them.

Again , thanks in advance.

McT
 
Lowering your RAM frequency should definitely help you get your system stable.

I've seen several people online who are running 12GB of RAM and have their chips clocked to 4GHz+ and they don't seem to be having any issues at all.

You will need to add more Vtt than what you had been using when you were only running 6GB as well, because using 12GB is going to add more stress to the processors IMC.

Raing IOH Core voltage can also help get things stable to.
 
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McstylisT said:
The reason i went 12GB without a concern is i have met and seen many people who run 4ghz+ with 12GB ram @ 1600mhz. I must admit many do not use the DFI boards , but i know its a quality board.

Im now wondering if lowering my mem speed to say 1333mhz will help me achieve my 4ghz clock. What do you guys think ?
Click to expand...

Yeah I'm not saying it's impossible but running memory at 1600mhz on an i7 is deemed overclocking and your CPU may or may not be capable, the IMC is rated for 1333mhz operation so lowering memory speed to that should indeed help stability.
 
I use to be overclock 4.2Ghz with 12gb of ram and had no problem with it. But, I think 12gb of ram wouldn't make it any different to 6Gb of ram. I had go back to 6gb of ram because it boot up lot quicker time than the 12gb of ram (takes age to test memory ram before load into windows)
 
Thanks for all the replys people.

But as you can probably tell from my time delayed response i've still had problems.

I tried many things.

I raised the CPU voltage upto 1.3v as required for some 4ghz clocks.
I raised the CPU vvt to 1.3v , and the pll a little , also IOH a little too.
I raised the ram volts down , up max throughput was 1.69v went down to 1.6v.
I changed the ram speed to 1200mhz with 2400mhz uncore , tried more or less 1333mhz too.

None of these would boot at all with 12GB installed at a 200 blck.

A strange thing i would mention is that now with 12GB installed , if i Manually select the voltages as i normally would, the system refuses to boot. It only seems to boot when the CPU voltage is at auto. ? ? ?

I am using a DFI mobo , any of you guys actually used a DFI bios. ?? Do you know of any new bios updates as the dfi site dont even list my jr x58 mobo. ?

I am currently @ blck 162 with turbo , so 3.4ghz on load. But with stock volts which is a pain. The ram is happily at 1620mhz at this speed. ?? Its the closest you can set it as its in ratio with the blck.

Any other help would be appreciated. Those who have the 4ghz clocks with 12GB lets please have some settings. Like ram volts , cpu volts , vvt volts uncore feq , stuff like that.

Thanks ,

McstylisT
 
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Ok a slight improvement.

Been able to secure 3.6ghz clock , 171 x 21 with turbo

However ram speed was 1376mhz to be exact with timinngs of 9-10-10 -19 with 1.69v needed to boot. Although the bios designates this 1.69 it only seems to draw 1.66v into the bus. If i choose 1.66 it only puts 1.63v through. ?

The way this board /bios works is if i now increas the blck , then the ram speed also increases in small increments. Reaching 4ghz puts it at or near 1600mhz and 3200 uncore which is where im getting the problem.

I did however change a few settings :

CPU core - 1.2v
CPU vvt - 1.26v
CPU pll - 1.85v
IOH / ICH - 1.19 - from 1.10v.

I would be quite happy at 3.8ghz to be honest , im on the track it seems.

Any extra info would be useful at this point.

McstylisT
 
You shouldn't need to adjust CPU PLL yet, will only really stabilise higher BCLK as far as i am aware (210+), I didn't need to adjust IOH until at 4.2ghz (205x21) which went to 1.2v.

My Vdimm only needs to be adjusted when going over 1.375v on VTT, you need to keep the two in relation otherwise you can start "losing" RAM, mine would only detect 10gb at this point. I raised Vdimm from 1.64v to 1.66v and then all 12gb was detected. However not had an issue where the PC would not boot (unless really unstable settings) and am currently working on getting 4.4ghz stable with RAM at 1683mhz, stock timings.

Saying about that I notice your timings, 9-10-10 -19, you tried it at say 10-10-10-28? you've tightened the last from 24 ???

Think for my 4ghz settings i use the following (191x21):

Vcore: 1.24275v
CPU PLL: 1.8v
VTT: 1.275v <--- possibly wrong but haven't used 4ghz for a long time, possibly upto 1.3v
Vdimm: 1.64v
IOH: 1.1v

Stock settings of 8-8-8-24 @ 1600mhz (reports as 1603mhz)
 
Watching with interest, as I'm looking to get a second 6gb myself.

Are the two sets the same or different versions? Somewhere on the ram will be ver #.#, ideally these should match. I'm trying hard to get a set with 3.2 written on to reduce the odds of something like this happening.
 
Mine are the version 3.2, both sets, which from another forum are stated to be the poor Elpida chips and a bit naff for clocking, got the 12gb to 1683mhz no problems when testing 4.4ghz though without extra Vdimm needed
 
Amusing. I'm not that surprised my set is a rubbish one, I just want the second set to match.

The other option is selling these at a loss and getting two new sets with matching versions, which doesn't sound that wise. I think I've tried to buy one of your sets off you already :)
 
Hi ,

Been trying to get this sorted out , to no avail.

Thanks to PaulyD for the very useful post. I amended the settings but unfortunately it was a no go.

It seems with the 12GB installed the 200 blck seems to be a problem. I reduced the multiplier to 18x no turbo ( so 3.6ghz ) with the mem @ 1600mhz 3200 uncore. Went to boot as normal , got blue screen and a restart. ? ?

To answer about the ram , its supposed to be the exact same batch 1600mhz with 9-9-9-24 timings. I will open up the case and have a closer look tomorrow i guess.

I have now a strange batch of bootable settings. ?

CPU is 175x21 = 3.67ghz load with auto core voltage ( temporary )
Ram is using only 1.65v in bios ( using 1.61 ) @ 1400mhz and 2800 uncore , with the odd timings of 9-10-10-19-59 2T. ?? Its working ??
Its just a little confusing seeing how it does this fine but struggles any higher.

Have not been able to even achieve a boot-able 3.8ghz clock yet.

Any other ideas anyone. ??

Do you think its just my motherboard. ? I would consider selling it off and getting maybe a UD5 or something. ???

McstylisT
 
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