Have you fried your cpu with an extremely high qpi/vtt?
My xmp profile says for 2000MHz 1.6v qpi/vtt is required. At 1866MHz, I can boot with 1.355V but I get errors with memtest86. 1.6V is in the red according to Intel. I can boot up and run stable with prime95 at 2000MHz using 1.6V but how much damage will a qpi of 1.6V cause??
What motherboard and memory do you have? Ie; Asus P55 Deluxe, PV534G2000ELK
Originally Posted by angrycustomer
I'm assuming this is an older X58 platform? Is this correct? If so, first, we recommend to have active cooling on the system. 1.6v is the maximum voltage we recommend to set it at. It's a bit of an extreme voltage, we only recommend incrementally trying to achieve if the system is near-stable. As 2000MHz on this platform is essentially hit-or-miss depending on the strength of your memory controller...
If you're using something other than an Intel X58, then the QPI/VTT does not have to be that high.
Hi. I would have given more details but my phone rang at work when I started writing that.
i7 965ee @ 3.86GHz
Antec 620 Hydro Cooler
Dual gtx 460's @ 850MHz
12GB Patriot Viper Extreme DDR3 2000MHz @ 1867 MHz
120GB OCZ Agility SATA 3 SSD
Cooler Master Stacker Case
I also have 6 120mm case fans and one is seated on the side directly on top of the RAM. It is 1800RPM @ 74 cfm. My system will boot with an auto qpi/vtt of 1.175V and it will take about 20min or so of running prime95 before I start seeing errors. I can still use a bit more tweaking to potentially set it lower but at 1.4V I can get 12 hours of prime95 with no errors. My system will not boot up at 2000MHz unless I have my qpi/vtt set to a minimum of 1.5V. I have not spent much time finding exaclty how low I can set my qpi/vtt but I jumped all the way up to 1.6V and found prime 95 will run for at least 2 hours(did not attempt any longer) with no errors. Also, with RAM set to 1066MHz I can get 12 hours with no errors running prime95 at 4.2GHz so I am sure it is the RAM that is causing the errors when I increase the frequency.
And yes I did already find and read the info on that link you provided before I started posting but I have yet to see any info in regards to how safe a qpi/vtt of 1.6V is. Ignoring any temperatures, will 1.6V cause damage due to over voltage? I have to assume that Patriot would have done lots of testing to back their results but all they are telling us is that we may need to use up to 1.6V but they are not saying whether this is a safe voltage or not.
Originally Posted by angrycustomer
We've haven't seen any issues long-term but we want to advise to proceed with caution. Some systems (X58) simply cannot hit the 2000MHz. How high are you able to get it stable? Some of our customers have had to settle for 1866 or 1800. If you can run it in this range, it can be a limitation of the memory controller itself.
With a qpi/vtt of 1.6V @ 1988MHz, I was able to run prime95 for 2 hours with no errors but I shut the test down for fear of burning up the onboard memory controller since 1.6V flashes RED! I lowered the qpi/vtt to 1.45V @1867 MHz and ran prime95 for 12 hours overnight with no errors. I had previously been using an OCZ gold 1866MHz 6GB kit running at 1866MHz with a qpi/vtt of 1.25V and was able to run prime95 for 12hours error free so I was expecting similiar results when I purchased my current Patriot kit. I realize 12GB will require more qpi/vtt to run overclocked than 6GB but I had not idea it would be so much higher. I did not find any of this info when i researched the product before buying it.