FattyPC Posted December 7, 2010 Share Posted December 7, 2010 I am at present runing the i7 920 at 4.02Ghz, giving a ram strap of 1532MHz @ 74.20.7.7.7T / 1.65v Vdimm / 1.35v QPI/Dram / 1.34v Vcore A) Can I tighten these timings anymore, are there any recommended tighter timings ? B) What is the highest voltage I can put through these ram modules ? C) These modules are meant to run at 2000... ( IMC Dependant ) REF - I have read intel state 1.35 QPI/DRAM is the Max Volts... In these forums I am reading that the QPI/DRAM has to be 1.6v to run at 2000 with the XMP, to be stable ? i) What is the correct & Max QPI/DRAM Voltage needed to run at 2000 ? Is it safe to run i7 920 @ 1.6v QPI/DRAM ? ii) Intel talk about a 0.5v difference between QPI/DRAM & DRAM Voltage, please recommend QPI/DRAM against DRAM - While at 1.35QPI & 1.65VDIMM were ok, what about 2000MHz...Please Elaborate B) Would I benefit from running 2000 vs 1532 @ tighter timings ? I know I have alot of questions, I would be grateful if you could answer them individually so I get every answer I need. Appreciate any members input, tnx in advance... Link to comment Share on other sites More sharing options...
Wired Posted December 7, 2010 Share Posted December 7, 2010 In these forums I am reading that the QPI/DRAM has to be 1.6v to run at 2000 with the XMP, to be stable ?Please provide a quote. Link to comment Share on other sites More sharing options...
FattyPC Posted December 7, 2010 Author Share Posted December 7, 2010 Wired, Here is a quote, sorry I didnt provide this earlier. I am sure I have read it on a few posts... Im sure I have seen 1.6QPI/DRAM ref on a pdf data sheet too... I know the quote is for 1866 at present, fairly similar ram, if I find another quote I will add it, this is from "RAMGUY" 1.6 Volts is what is set in the XMP Profile for the QPI VTT Voltage to run them at DDR1866, so yes it will be fine. I think your QPI voltage is set to low try 1.5v or 1.6v if you want them to work at spec I had same trouble with same ram and some ********s they would not work at 1.35 at all but at 1.6 I can reach 2000Mhz but my processor has problem reaching 4Ghz so I have downclocked to 3.6ghz and now have 12GB at 1.5QPI the ********s would not boot and would blue screen at lower QPI. If you notice when setting xmp Corsair puts QPI at 1.6V. Link to comment Share on other sites More sharing options...
trackrat Posted December 7, 2010 Share Posted December 7, 2010 Per my signature nothing is guaranteed in overclocking. RAM GUY has stated that the Corsair DDR3 RAM is safe up to 1.70 V but from experience we know that some Intel CPUs /mobos do not like the RAM voltage higher than 1.5 V. Intel does like to keep the QPI and DRAM voltage spread within .5 V. FWIW, my testing on DDR3 RAM with 3DMark Vantage show almost zero system performance gain with changes in latency from 8-8-8-24 1T to 11-11-11-30 2T @ 1333 and 1600 MHz. Your results may differ but in reality latency is no longer as important as it once was due to the increased bandwidth on new PCs. Link to comment Share on other sites More sharing options...
FattyPC Posted December 7, 2010 Author Share Posted December 7, 2010 All forum members comments welcome, Im specifically interested in what peoples views are about... 1.6 QPI/DRAM, Is it safe on a i7 920 ( Intel say 1.35 ? ) So why do the GT's need 1.6v ? - Im, struggling to understand as my Dominator GT 2000 said expecially designed for i7 extreme edition on the package and unless there a different Qpi other than 1.35, for the extreme edition ( Correct me if im wrong then ??? but the extreme edition is still a i7, so 1.35 qpi ?) why is the dom gt's designed so far out of spec for qpi/dram volts... Maybe there are other setups which can use 1.6v safely to achieve xmp & 2000, but again...Dominator GT 2000 said expecially designed for i7 extreme edition on the package, beggs the question... Im just feeling a little annoyed / cost so much.. Any other relevant info, regarding my thoughts & about GT 2000 timings... All comments welcome, tnx in advance... Link to comment Share on other sites More sharing options...
trackrat Posted December 7, 2010 Share Posted December 7, 2010 The CMT6GX3M3A2000C8 is designed for i7 extreme memory profile and it has been tested and confirmed to run at 2000 MHz. but that does not mean that all i7 CPUs will run RAM @ 2000 MHz. Intel i7-9xx series CPUs are only guaranteed to run RAM @ 1066 MHz. Anything beyond the official 1066 Mhz. RAM speed is overclocking and not guaranteed by anyone including Intel. The XMP profile is a best guess at what might work for many people. The only means to determine the highest frequency that your PC hardware will operate at stable is by testing. Overclocking is a hobby not a destination. The link below might help? http://www.techreaction.net/2010/09/07/3-step-overclocking-guide-bloomfield-and-gulftown/ Link to comment Share on other sites More sharing options...
Wired Posted December 7, 2010 Share Posted December 7, 2010 I'd look for a more recent quote by Ram Guy or Yellowbeard, as the user in that thread didn't state which specific part number they had. I'm pretty sure based upon D9F that they had a kit of memory which is no longer made and the IC is no longer available, so the advice may have been explicitly for that scenario, but again, I'm not sure. Link to comment Share on other sites More sharing options...
FattyPC Posted December 8, 2010 Author Share Posted December 8, 2010 Hi all, tnx for the replys so far... I totally understand memory is only guaranteed to run at 1066 on the i7's, I have overclocked and watercooled my systems as a hobby too ... for the last 15+ years... "GREAT FUN" I am just trying to understand this 1.35v to 1.6v QPI/DRAM... I have run stable at upto 1600 all ok, I can run the xmp profile @ 2000 but it needs 1.6 QPI/DRAM to do so but isnt completely stable at that, programs seem to lagg... ( Still needs a little more research ) I am after knowing how safe it is to run at 1.6v QPI ?, after all the memory designed to do so and is for the i7 but then why is intel max 1.35... Am I at risk of burning out the IMC @ 1.6v on the Chip ? I am quite happy runnning this memory @ 1532 74.20.7.7.7T (1T) So to clarify - I am just trying to understand this 1.35v to 1.6v QPI/DRAM...& what is the max to put through the i7 Chip, inc the 0.5v rule ( QPI-DRAM/DRAM ) + Is it going to cause a problem running @ 1.6v for the IMC ? Also if some one could advise - What are the max volts for these modules - CMT6GX3M3A2000C8 *** 1.65v Max ( As stated on the packet ) *** 1.6 - 1.7v *** 2.0v Tnx in advance... Link to comment Share on other sites More sharing options...
FattyPC Posted December 9, 2010 Author Share Posted December 9, 2010 Hey Wired, here is a more up to date post ref QPI VOLTS... Try the QPI/VTT voltage at 1.45-1.55 and see what happens. Ref - Got my new motherboard and memory today, I was hoping to get the system running quickly at full speed (with the ram at DDR3-2000) using just the XMP profile, but the system fails to POST using just the XMP profile. I noticed that the XMP profile/bios didn't increase the QPI Volts (it's still at stock around 1.2 if I remember correctly), I read that that in order to reach memory speeds of 1600Mhz and 2000Mhz the bios settings needs some further tweaks, I was hoping that since this ram is on Motherboard QVL List the bios would set everything for me using the XMP profile, this doesn't seem to be the case though. anybody got any suggestions for correct bios settings to get my ram running at 2000 Mhz thanks in advance -Andres Link to comment Share on other sites More sharing options...
trackrat Posted December 9, 2010 Share Posted December 9, 2010 Yes according to Intel you are at risk of damaging your CPU by running the QPI @ 1.6 V. According to RAM GUY the Corsair DDR3 RAM can be run up to 1.7 V without issues. (Yes I am aware that there is some 1.8 V Corsair DDR3 RAM but this is the exception.) The RAM is speed rated at the voltage on the Corsair DIMM label which can be from 1.5-1.65 V depending on the RAM. Link to comment Share on other sites More sharing options...
Wired Posted December 9, 2010 Share Posted December 9, 2010 1.8v for DDR3 was the norm for CPUs that came out before Intel Core iX. Link to comment Share on other sites More sharing options...
FattyPC Posted December 10, 2010 Author Share Posted December 10, 2010 Yes according to Intel you are at risk of damaging your CPU by running the QPI @ 1.6 V. According to RAM GUY the Corsair DDR3 RAM can be run up to 1.7 V without issues. (Yes I am aware that there is some 1.8 V Corsair DDR3 RAM but this is the exception.) The RAM is speed rated at the voltage on the Corsair DIMM label which can be from 1.5-1.65 V depending on the RAM. Hi there.. Are you saying " QPI CAN BE RUN UPTO 1.7 ?" Quote - RAM GUY the Corsair DDR3 RAM can be run up to 1.7 V without issues ? Am I understanding you correctly ? Link to comment Share on other sites More sharing options...
trackrat Posted December 10, 2010 Share Posted December 10, 2010 NO QPI is not RAM voltage QPI in Quick-Path Interconnect voltage, i.e the data BUS to the RAM. RAM or DIMM voltage is the voltage that the DIMM runs at. The DIMM modules can run at up to 1.7 V NOT the QPI. Link to comment Share on other sites More sharing options...
FattyPC Posted December 10, 2010 Author Share Posted December 10, 2010 NO QPI is not RAM voltage QPI in Quick-Path Interconnect voltage, i.e the data BUS to the RAM. RAM or DIMM voltage is the voltage that the DIMM runs at. So what should these modules be run at for QPI ? Im getting a little lost, Can I run these at 1.6QPI for 2000 & is this safe on an i7 920.. Link to comment Share on other sites More sharing options...
shadow6491 Posted December 12, 2010 Share Posted December 12, 2010 Well I have finally managed to get my 2 sets of CMT6GX3M3A2000C8 runing at 1920Mhz. It has taken using some exteme cooling to mamage this and tweaking the VTT up to 1.45V and the QPI PLL voltage to 1.25 as per the XMP profile. I run the Dram voltage at 1.66V as per the specs. I am using a BLK speed of 192 *10. I think I maight be able to push them a little bit more with a higher VTT any ideas what people think is the highest safe voltage for 24/7 Link to comment Share on other sites More sharing options...
trackrat Posted December 12, 2010 Share Posted December 12, 2010 So what should these modules be run at for QPI ? Im getting a little lost, Can I run these at 1.6QPI for 2000 & is this safe on an i7 920.. Opinions vary on voltages and overclocking. As long as you're willing to accept damaged hardware you can always increase the voltage until something fails or your reach your desired performance goal. If it were me I would not run the QPI over 1.4 V and the RAM above 1.7 V for 24/7 use. Other folks might suggest 1.6 V QPI and 1.8 V RAM is acceptable? I personally would not run the QPI @ 1.6 V. Only you can decide what is right for your overclocking efforts. Link to comment Share on other sites More sharing options...
shadow6491 Posted December 12, 2010 Share Posted December 12, 2010 Just to confuse things a little bit mor there is QPi PLL voltage normal 1.1V XMP profile for this ram is 1.25V and then there is QPI/VTT normal 1.175 V red line is 1.6V. I am running about 1.44V and can not get 12GB to run at 2000Mhz. Link to comment Share on other sites More sharing options...
trackrat Posted December 12, 2010 Share Posted December 12, 2010 XMP profiles are a best guess at what might work. Manually setting the BIOS options properly for your specific hardware may yield better results. Link to comment Share on other sites More sharing options...
FattyPC Posted December 13, 2010 Author Share Posted December 13, 2010 I think there are alot of grey area's, the unknown, when it comes to what is safe and unsafe as far as QPI/DRAM Volts goes... Intel Say 1.35v Max There are several users in this forum who need 1.6 to run stably @ 2K You only have to see by running a search with CMG6GX3M3A2000C8 @ 1.6 QPI... My final thoughts are after finally achieving 2K intelburntest 2.5 ( Standard @ Present with 5 runs - I will be running @ Very High Soon... ) i7 920 @ 4.2GHz - 21x200 - Corsair @ 2005MHz - 110.24.9.9.9T ( I aim to try tighten these tinmings up a little now too ) Please note although you will see my voltages + QPI/DRAM @ 1.6v - I am running a custom watercooling setup with a 900Lt/hr pump & XSPC RX360 Rad etc, these play a part in being able to run at these volts in my opinion... My PC also doesn't run 24/7 - ( A Few hours a day for a few days a week + a couple of nights gaming - 30Hrs a week absolute Max - Just for a ref. ) Idle - 38-40 Degrees Full load Gaming - 60 Degrees Full Load Intelburntest 2.5 - 65-80 Degrees http://www.kclinternet.karoo.net/4.2GHz - 2005MHz @ 24.9.9.9T - STABLE.JPG Hope my testing may help others but don't forget, all testing is on your own back, overclocking is not an exact science. My settings are only a ref. I dont guarantee them.. Remember if you overclock, you have to be happy enough to pay out if something fails, remember if your inputting the voltage settings then your taking ownership, all faliures are at your expense, if your happy with that - Get Overclocking. Find the place you are happy with - thats your ******** Link to comment Share on other sites More sharing options...
FattyPC Posted December 13, 2010 Author Share Posted December 13, 2010 Just an update - Now running - QPI @ 1.525v (Bios) R3E GENE / 2K @ 8.9.8T (2T) Intelburntest Stable - Standard 5 Runs Link to comment Share on other sites More sharing options...
d3m0n_edge Posted January 1, 2011 Share Posted January 1, 2011 I got mine running a QPI of 1.500v (set in the BIOS) where after Windows boots up = 1.455v @ 2000MHz with the specified 8-9-8-24 timings and 1.65v DRAM voltage. Link to comment Share on other sites More sharing options...
FattyPC Posted January 2, 2011 Author Share Posted January 2, 2011 I got mine running a QPI of 1.500v (set in the BIOS) where after Windows boots up = 1.455v @ 2000MHz with the specified 8-9-8-24 timings and 1.65v DRAM voltage. Hi there, I have managed to get mine to run @ 8.9.8T (CR1) @ 2000MHz What CPU are you overclocking and what volts for a ref. ? I Have the i7 920 - Bios Volts OC3D @ 4.2GHz CPU 21x200 I have used a multimeter on the board and the bios is very accurate... CPU VCORE - 1.420v QPI PLL 1.81v QPI/DRAM 1.5250v PCIE 1.5 IOH & ICH 1.2v VDIMM 1.656v What volts & overclock hae you achieved for ref... tnx in advance Link to comment Share on other sites More sharing options...
d3m0n_edge Posted January 2, 2011 Share Posted January 2, 2011 I'm overclocking an i7 920 D0 CPU to 4GHz (20x200). Voltage readings from my OC Station show: VCore: 1.204v PLL: 1.812v QPI: 1.455 IOH: 1.210 IOH PCIe: 1.508v ICH: 1.111v ICH PCIe: 1.508v DRAM: 1.654v Using the settings above, I have achieved 4.2GHz (21x200) with my memory at 2000MHz (8-9-8-24). CPU load temperatures rises from 36 to 44 degrees C, and idle from 30 to 35 degrees C. But I'm staying with 4GHz for now. Forgot to mention, my CPU is cooled via water, which keeps my temps down alot (Quad rad + dual rad). Thinking of cooling the NB, SB, VRM/Mosfets and VTT card soon. Link to comment Share on other sites More sharing options...
icecube Posted January 4, 2011 Share Posted January 4, 2011 Are you guys testing all your ram ? I am running LinX with 5000+MB and can't get 25 passes even at 1.6V QPI (fails after ~20 passes). At QPI 1.55V I can only achieve ~10 passes. Link to comment Share on other sites More sharing options...
FattyPC Posted January 4, 2011 Author Share Posted January 4, 2011 Are you guys testing all your ram ? I am running LinX with 5000+MB and can't get 25 passes even at 1.6V QPI (fails after ~20 passes). At QPI 1.55V I can only achieve ~10 passes. *** I have run only intelburntest 2.5 - Standard 10 Runs - PASS *** I have run Battlefield Bad Company 2 for 3+ Solid Hrs - THATS A PASS IN MY OPINION ! 110.8.9.8T (CR1) @ 2000 Link to comment Share on other sites More sharing options...
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