xxxitrxxx Posted March 16, 2009 Share Posted March 16, 2009 Hey all, So I went through the steps here....http://www.houseofhelp.com/forums/showthread.php?t=76702 These are my current voltages....CPU 1.22VQPI/DRAM 1.35VDRAM Bus 1.65VICH 1.11VICH PCIE 1.51VIOH 1.14VCPU PLL 1.81IOH PCIE 1.51V On the guide it says to use from 1.27500~1.35000V When on xmp previously it would push the QPI/DRAM to 1.38V. Something just seemed off with that and then I ran into that thread.I am currently using 1.35VWhat is the best way to determine to see if i need less than that? Thanks! Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted March 16, 2009 Corsair Employee Share Posted March 16, 2009 You can try reducing the voltage a step at a time, and test for stability at each step. Test it using the system for what you built it to do. There are also some good stress tests such as Prime 95 etc that you find by Googling if you want to do other tests. Link to comment Share on other sites More sharing options...
DerekT Posted March 16, 2009 Share Posted March 16, 2009 Download Memtest86+ V2.11 from--->Hereand extract the ISO image. Burn the ISO image to an CD-ROM disk. Download CPU-z from Here . Download Linpack from--> Here. Download Realtemp from Here .Set to XMP and then incrementally drop the QPI/DRAM Voltage. Boot to the memtest CD and allow for two full passes on each drop. Enter Windows and run Linpack for full memory (1) and use a 5 pass iteration. Run Real Temp and watch the temperatures. Let the Linpack program run for the full 5 passes. The output in the screen will give you five sets of values for "Residual <norm>. They should be identical for a stable CPU and DRAM. Link to comment Share on other sites More sharing options...
xxxitrxxx Posted March 16, 2009 Author Share Posted March 16, 2009 You can try reducing the voltage a step at a time, and test for stability at each step. Test it using the system for what you built it to do. There are also some good stress tests such as Prime 95 etc that you find by Googling if you want to do other tests. Do those voltages look safe to you though? Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted March 16, 2009 Corsair Employee Share Posted March 16, 2009 On the guide it says to use from 1.27500~1.35000V When on xmp previously it would push the QPI/DRAM to 1.38V. Something just seemed off with that and then I ran into that thread. I am currently using 1.35V What is the best way to determine to see if i need less than that? Thanks! Do those voltages look safe to you though? The voltages look fine to me. But, as with any OCing venture, the lowest voltage you can run and be stable is best. Link to comment Share on other sites More sharing options...
xxxitrxxx Posted March 17, 2009 Author Share Posted March 17, 2009 Download Memtest86+ V2.11 from--->Hereand extract the ISO image. Burn the ISO image to an CD-ROM disk. Download CPU-z from Here .Download Linpack from--> Here. Download Realtemp from Here .Set to XMP and then incrementally drop the QPI/DRAM Voltage. Boot to the memtest CD and allow for two full passes on each drop. Enter Windows and run Linpack for full memory (1) and use a 5 pass iteration. Run Real Temp and watch the temperatures. Let the Linpack program run for the full 5 passes. The output in the screen will give you five sets of values for "Residual <norm>. They should be identical for a stable CPU and DRAM. Ok thanks guys. I also read that the QPI/DRAM should be within .03V of the cpu voltage...Is that accurate? http://www.hardforum.com/showthread.php?t=1393402 "Golden rule to follow on most i7's, is to keep your QPI/VTT within 0.3v of your CPU Vcore. For example, I have 1.3625v Vcore, and 1.39 VTT/QPI." CPU at 1.22V seeems as bit distanced from QPI/DRAM 1.35V? For now I am running default timings with CPU at 1.22V and QPI/DRAM 1.20V DRAM 1.65 Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted March 17, 2009 Corsair Employee Share Posted March 17, 2009 "Golden rule to follow on most i7's, is to keep your QPI/VTT within 0.3v of your CPU Vcore. For example, I have 1.3625v Vcore, and 1.39 VTT/QPI." CPU at 1.22V seeems as bit distanced from QPI/DRAM 1.35V? That's extremely close and well within the .3v Derek noted. I have not seen it personally but some users are reporting that Intel quotes .5v, not .3v. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted March 17, 2009 Corsair Employee Share Posted March 17, 2009 For these modules you have the QPI Voltage may need to be set to 1.65 Volts but if i is stable at those settings you should be fine. Link to comment Share on other sites More sharing options...
DerekT Posted March 17, 2009 Share Posted March 17, 2009 I need 1.52v for my 1866Mhz memory. I set to XMP and then lowered the values. The necessary value will depend on the quality of the CPU and since there can be no individual testing of every CPU, I advise you to set to XMP and then lower values. The value is .5v between DRAM voltage and QPI/VTT DRAM voltage. Link to comment Share on other sites More sharing options...
xxxitrxxx Posted March 18, 2009 Author Share Posted March 18, 2009 I mean to be asking about voltage difference between CPU and QPI/DRAM. I am aware of the need to have a voltage minimum of .5V from the QPI/DRAM and DRAM. Is a voltage difference of CPU 1.22V and QPI/DRAM 1.35V ok. That one forum said to have .03V. Thanks! Link to comment Share on other sites More sharing options...
DerekT Posted March 18, 2009 Share Posted March 18, 2009 I am aware of the need to have a voltage minimum of .5V from the QPI/DRAM and DRAM. OK Is a voltage difference of CPU 1.22V and QPI/DRAM 1.35V ok. That one forum said to have .03V. Is the difference between 1.22 and 1.35 < .5v? Check more forums and ask the person who posted the differential to be .03v if that is correct. Ask others in that thread if it is correct. I don't know who would say such a thing personally and it is always funny that fifty sources will show what is the prevailing wisdom and some ONE person will post something that is against the prevailing wisdom and that is the one that is picked. For your research: http://67.90.82.13/forums/showthread.php?t=207972 Also, keep in mind, this is regarding X58 and i7. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted March 18, 2009 Corsair Employee Share Posted March 18, 2009 I am aware of the need to have a voltage minimum of .5V from the QPI/DRAM and DRAM. Is a voltage difference of CPU 1.22V and QPI/DRAM 1.35V ok. That one forum said to have .03V. Thanks!1.35v - 1.22v = .03v. The Intel recommendation is .5v, not .03v. Link to comment Share on other sites More sharing options...
Wired Posted March 18, 2009 Share Posted March 18, 2009 1.35v - 1.22v = .03v. The Intel recommendation is .5v, not .03v. uumm.... that's 0.13v. Also, from the beginning I heard that it was within .5v, and I think I saw the Intel white paper that said it, but can't quite remember. Link to comment Share on other sites More sharing options...
xxxitrxxx Posted March 18, 2009 Author Share Posted March 18, 2009 uumm.... that's 0.13v. Also, from the beginning I heard that it was within .5v, and I think I saw the Intel white paper that said it, but can't quite remember. Yup, I agree with you... What confused me was this post.... http://www.hardforum.com/showthread.php?t=1393402 "Golden rule to follow on most i7's, is to keep your QPI/VTT within 0.3v of your CPU Vcore. For example, I have 1.3625v Vcore, and 1.39 VTT/QPI." Then two posts under .03V no 0.3V So I take it it's point .5v for difference between QPI/DRAM to DRAM Bus Now....is that .5v for the CPU to QPI/DRAM as well or would it be more or less restricted? That is what I am confused about... Thanks! Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted March 18, 2009 Corsair Employee Share Posted March 18, 2009 The default QPI Voltage will normally be .9 to 1.1 Volts but it will vary with MB and chipset. Link to comment Share on other sites More sharing options...
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