HalloweenWeed GaretJax84 did you try playing around with the tRL settings? Also try VTT in the range of 0 to +100 (when no CPU OC) And I assume you plugged in your mfg spec latencies manually? Unfortunately it may be that you are using OCZ RAM too. Is there any way you can swap RAM with somebody else temporarily to test that? Are you positive that all sticks are fully seating in the sockets? What PSU do you have?

 



I did manually plug in the mfg spec latencies. It may be that I'm using OCZ RAM, who knows. 

I tried the VTT, but even bumping it up to +25 mv caused the computer not to start. I had to restart the CMOS. Could you be more specific on what the tRL and VTT settings are? 

Unfortunately I don't have someone I can swap RAM with. I believe it may something else considering the OS is able to pick up the correct amount installed into the DIMMs, it's only the usable amount that is unstable. It actually swaps between 16GB usable and 8 GB usable depending on the restart. If I can solve what's causing that unstableness then I'm sure I'd figure out the issue.  Maybe it's the CPU? :D

Everything is fully seated. I'm not sure it's the DIMM sockets now. The OS is able to see what's really installed, all of it is just not available. 

PSU = Cooler Master 1000W Silent Pro

Alright. Thanks for your assistance. I greatly appreciate it. 

I'm assuming it's the CPU now, but the only way to test that would be to plug it into another machine or plug another one into mine. Throwing more good money after bad. Not to mention my ability to return the CPU or get a new one is probably limited since I don't have the original box or stock heatsink. 

Thanks again for your assistance. I'll just keep playing with it and if I ever succeed I'll let you know. :D

Also to add: When i press the power button on my computer it starts up  for 5 seconds then shuts down 5 seconds later it fully starts up with no problem at all... 


I'm having a similar issue but my system always sees the full 6G on a cold start and loses 2GB on reboots.


As for the issue above, this is normal when starting your PC after the PSU has been turned off in the back or has been unplugged.

Squid0023 The sad thing is if i have to RMA this board it'll be my second RMA which is getting ridicolous and frustrating...

The most probable sad thing is that it is not a motherboard problem. You may have already read this whole thread, but if not, it is imperative that you do. Every setup issue is here already.

[Problem Solved]

After reading on a couple of problems i decided to Take my computer apart opened up the CPU socket saw that there were no bent pins at all took some Duster and Sprayed the Air on my CPU and i also aired out all of my DIMM sockets... then the next thing that i changed is the Tightening of my Aftermarket Cooler the Thermalright Cooler Venomous RT! So i didn't tightin it to tight put memory in the DIMM 3 and DIMM 1 and 4GB BAM no (USABLE) or any of that stuff... So i wanna go help out everyone else now see if i can help...

HaHa! Hell ya :D I'm pretty stoked i spent my whole day from 8:30 AM till like 6:00 PM going balls to the wall haha.. Paid off i seriously hope this helps alot of peoples problems..

recon 7185 I had this problem. Went to microcenter and they determined IN MY CASE (capitalized because there has to be more than one cause for this) i had a hardware problem. So since I was within 30 days, and after a convo with EVGA support (who was not fast to blame everyone but them which makes me glad that I went with EVGA due to them being willing to site their hardware as a potential culprit), I exchanged my mobo, cpu, and changed from corsair ddr3 2x2gig 1600 (dual channel) to 2x3gig patriot ddr3 1600. Loaded win 7 64-bit and it recognized all 6 gigs. Let it be known that I did not do a fresh install of windows 7 from when my computer only recognized 1.99gigs of 4 gigs from before. This eliminates windows 7 as the cause in my opinion.

My problem started after a BSOD coming out of sleep mode btw, so it was fine for a while. Also my comp is a new build (1 week old).

Again this is what happened IN MY PARTICULAR CASE....

If things change I will be sure to update and I will help anyone where I can if they want more details, etc.

In your case, or for that matter for anyone else with this *mysterious* problem, you went the luxurious route and replaced all the usual suspects, which undoubtedly made for a quick and certain positive fix. I think you did the smart thing. Good advice for everyone.

UPDATE

Nope now I get the 4gb on a cold start.  I f I turn it off and back on again, it will see all 6gb.

WTH

I think the most important lesson from this thread is that this really is just one of two things: Bad settings, or placement/installation of hardware, or an actual hardware problem!

So although the problem can be caused by many different things, if you have tried changing almost every setting under the sun, reseated your CPU, flashed your bios, cleared your bios, played with voltages, QPI, clocks, played with DIMMs, timings etc. etc. etc...and you still have the problem,

THEN YOU PROBABLY HAVE A FAULTY PIECE OF HARDWARE AND RMA IS IN ORDER! :)

So even though playing with settings might work for someone, don't discount the fact that you might have a hardware problem or incompatibility somewhere along the line!

Updated the first post with some more info, links and pictures.
Thanks to rjohnson11 for some insights in his thread and HalloweenWeed for keeping this thread alive.
Please use this tread as a troubleshooting guide. If you experience similar issues start you own thread and   describe you problem and steps you took, Its always good idea post you Computer specs in they are not in you signature. and copy and fill out this handy template by iride4u located here
http://forums.evga.comarchive/tm.asp?m=100548328
If you have a solution that worked for you and its not in this thread or on this forum you can post it here and give a description of the steps you've done or give a link to a particular thread.
Thanks a lot for participating. :)

You cannot use just slots 1 & 5 RTFM!
 

sportwarrior

Alright, digging up this thread a few weeks later when I have some time to work on the computer...
a) " Everytime I set the BIOS to AUTO for DIMM voltage it sets itself to 1.7v. I don;t know how long it was doing that."
 
b) " I've got a set of g.skill 9-9-9-24 2.5v DDR3 1600, and I have no idea why it defaults that high. I also have to set the timings on my own, because it tries to default the timings to something ridiculous like 7-7-7-20 1T.

c) ''I just reseated the CPU and I'm still getting this stupid problem". I'm startin to get really frustrated, because this just simply isn't something that should be happening.

 
Hi there.
a) I would recommend setting your ram voltage manually. 1.65 is a typical voltage for ram on x58 platform, though manufacturers started coming up with lower voltage ram kits like 1.5, 1.35 volt kits look at you ram specs and set it in bios accordingly. 1.7 it a bit on the high side. 1.65 what Intel max recommended voltage on internal memory controller (IMC)
b)  - set of g.skill 9-9-9-24 2.5v DDR3 1600,  I dont know any ram kits with such high voltage. So lets say its a typo. If you intend to run your ram at 1600mhz speed. 
example:  your Bclk is 160, you ram ratio is 2:10 = 1600mhz and CPU speed is 3.36ghz then you set you timing according to what it says on the sticker of you modules. If you running it at default speeds than you bios will automatically load default speeds for 1066mhz ram - which is that 7-7-7-20 you were seeing in bios I believe. ( you have to see what ratio is closer to you ram speed, for 200 QPI bclk you ram ratio would have to be 2:8, 8*200 = 1600. and so on)
You also need to bump your Vtt voltage as you go with higher QPI clock.
QPI pll voltage needs to be somewhere 1.2-1.3v YMMV
In my first post there some more tweaks you can try in bios.
 
and c) what kind of cooler do you have. (for the future reference its nice to let people know what hardware you have - mobo, cpu, ram, psu etc., it might help with detecting the problem ;) )
If its one of the big ones like Nochtua, Megashadow or alike. try relieving the tension on the cpu, cause its known to case the missing raM issue.
 
d, e, f, etc., ) look through this thread and others. there are planty advice. And if none works then swapping the ram with the new one might be the only option.
 
Good luck and hope it helped.
Ghost :)
 
 

Iamrogue

RAM is found
had the same problem,
by setting my QPI to 210 RAM did show up again, the problem ocures when i had qpi betwean 180 and 210.
now i just went from 21 x 200 to 20 x 210, have the same clock on CPU and 6GB RAM with 1680 MHz speed.

 
This guy has the key!
 
Ok so i have 6 sticks of 2gb corsair and when i over clock past 881 my ram drops to 4GB,  when i go past 200 or so it will boost to 8gb and then once i pasted 213 BINGO 12gb found.
 
My current overclock is 21x213 a bit over 4.4 GHZ

haha oops 181 :P