6GB Corsair Reverts To 4GB

Ok I am having a really annoying problem. I built a new pc with the following Specs.
Antec 1200
Core i7 920 Overclocked at 3.60GHZ W/Coolermaster V8
ATI Sapphire 5970-Flashed to BIOS File A02 To Get Fan Control
6GB Corsair Dominator 1600MGHZ Underclocked to around 1400+MGHZ
Asus P6t Deluxe V2 With Latest BIOS flashed 1 Day Ago
640GB Western Digital Caviar Black
Zalman 1000Watt PSU

Problem- When I built it everything worked. Then the next day the bios and os said I only have 4GB Memory installed. I took one stick out and put it back in and it went back to 6GB. Then day later 4GB again. I updated BIOS and it worked for a day or two. Now I restarted and it's 4GB again. What seems to fix it is just resetting the BIOS. But then I have to overclock and do all the settings over again. I think it could be Windows related because when I do some changes on here it seems to happen.

Thank You!

What Windows OS are you running? I am pretty sure that if you are running XP the maximum memory recognized is 4gb.

There are a couple issues with those boards. First off you might need to make sure you have the right memory voltage, probably 1.65. Make sure you set that in the bios. Secondly I would remove all the ram chips and reinstall them. The boards can be picky about how the memory chips are installed. I have had 2 of those boards and each one did that to me. I also had a problem if the memory wasn't set to 1.65 volts, which my memory required, it wouldn't show all 3 sticks (6G).

I am 2 having a problem with those same sticks, but i had an older pair of ocz ram that i ramd because it was showing up bad in memtest, thats what made me go ahead an show the dominators, when i had the dominators it would show 4 out of 6 then i changed it to xmp mode... and it showed 6 out of 6 untill i would shut down and power back up then it would go to 4 out of 6, so i took out 1 stick at a time, and booted up with 1 stick at a time, turns out that 1 stick would give me a blue screen ordered some more dominators that should be coming in this week, hopefully everything goes well with the new ones.

But yes this is a terrible problem..

If you havent checked already remove your cpu and check for bent pins then re seat the cpu make sure your cooler is not on to tight and making good contact. if not then check dim slots make sure none of them are dead, if not then it might be your memory controller on your cpu that has gone bad.

I almost want to sell my i7 system and get something else this has been ridiculous for me.

Ok, so Asus says it was the ram and not their mobo and to go run memtest and set my timings manually, they must not read what people tell them ...fail. Atleast their automated response was quick even though it was worthless based on the information that they made me give them ...i hope the cpu backplate is too tight

sorry about the spelling that fails just as bad

My CPU pins were not bent when i installed. Yesterday I took out a few sticks and put them back in and then set the voltage for DRAM to 1.65V. Also I am having locking up and everything. I can play games but if i can't do basic things then what did I build my core i7 for. Before I posted this I had to reset the BIOS and set voltages and CPU overclock and everything. If I turn it off it will stay at 6GB on resume but after turning off for 1 day it goes to 4GB. I have not done mem test because I didn't want to bother with making a USB botable thing. I think the new memory mite be problem or something because the timings are 7-7-7-20 but that shouldn't affect it.

I will run some memory test and probably clock back to Specs but i'm wondering why I would have some lockups and stuff. Because others go to 4GHZ and there fine. My temps are around 42C idle when is OS and 50-60 depending on the load. Also when I start the computer sometimes my Samsung 2433 just blinks and I have to reset motherboard even tho I know it's booting up into OS since my keyboard lights up when in OS.

I will loosen my CPU backplate tonight and a bit a see if that helps. It's like a lawnmower. When a lawnmower is cold it takes for pulls to start it. Then when you turn it off and u used it one pull can get it going again. Just like the ram after about a day it loses its heat and like one stick doesn't turn on. But to loosen the CPU Cooler I have to take the PC downstairs and remove the motherboard and all these cables and this big card makes it harder to do things.

*UPDATE: I have changed my settings to XMP with everything else the same. I have can not loosen cooler today. Report to me if loosening the cooler made ur 6GB detectable after a day. 7-7-7-20, 1.65V CPU 1.3V temps are now higher for some reason but I noticed that my SpeedStep was enabled so technically it was not overclocked. I also ran Memtest86+ Latest version via CD bootable ISO. I have not had freezing after changing some of these settings but it's probably cause now it is actually overclocked in OS also.

so far everything is working for me, I reinstalled windows though ...no bluescreens so far and ram is always detecting @ 6gigs
i had my cpu fan cranked down pretty far though so i think that helped. grats soto hope your problems are finished.

well yea i was getting all 6 gigs till i did a complete shutdown and then when i would power it up 10 seconds later it would only read 4 until i messed with the settings again.

ok Corsair got back to me, they said to crank qpi voltage up to 1.5v if that doessn't fix it then RMA the ram. i was doing alright till today ....bluescreened about 1/2 hour after being turned on and only showed 4 gigs on restart. so is turning the qpi voltage up that much gonna be bad, or does it only affect the ram?

Try the steps outlined in this thread below. If they do not work, check the modules with Memtest 4.0 from www.memtest.org with Legacy USB Support disabled in the BIOS. If they fail, we'll replace them.

http://forum.corsair.com/forums/showthread.php?t=82274

I just re-installed CPU and CPU coolermaster V8. I installed it in a different postion. Now it blows hot air towards top big antec 1200 fan. I got lower temps for some reason. I also re-installed ram sticks. I got all 6GB on start up but that was expected. tomorrow I will report back whether it detected 4GB or 6GB. I think the CPU cooler was really tight. This time I made it so I could turn it a little bit more so it's lose this time but all of it is in contact with the CPU. I will run memtest 86+ again. Before this I did one pass without any errors.

My computer has been on since I did everything with the re-install because I was downloading Dirt 2. I just finished playing that and so I needa wait till tomorrow to see if 6GB works on first boot up.

yeah 1.35 qpi and dram V @ 1.64 (since you cant get 1.65 on the p6t deluxe) you could prolly do 1.66 but i tried that also and still get the same problem ...i think its just the ram. i guess i could have RMAed my mobo too but im pretty sure it works fine since all the ram slots seem to be working right. I'm hoping for a refund since i see that the CAS 7 dominator is outta stock at newegg. then i can just get some more somewhere else so it's only a drive away rather then 2 weeks of shipping time. also I did the stuff the corsair guy said to do and its deffinatly the issue ...even 1.5 qpi volts didnt fix anything. I'll update you when I get ahold of some new stuff ...time to dust off the old AMD 4200 for a week or two

wait I should set the QPI/DRAM Voltage to 1.35 and the DRAM Bus Voltage to 1.65

*Update: I had the settings reversed. QPI was set higher-now I set to 1.35. and the Dram Bus goes to 1.64/1.66 not 1.65 like you said.

My temps went down a little with since the QPI isnt 1.65 anymore. Tomorrow I will see if these new voltages fixed the problem.

if you go the RMA route you should grab a marker and put a little dot on the sticks somewhere so you know if they send the same kit back. if you got them from newegg do it for sure then we can see if i get yours and you get mine

yeah, that's what i did and i had a bad one. RMAed back to newegg ...looks like they are outta stock till the 21st, hope i just get a refund so i can buy RAM local and not have to wait for shipping from CA since its like 4 days out for me. got my AMD 4200 up and runnin but I'm too scared to plug one of my video cards into this 350 watt PSU. ...anyways, yeah man memtest one at a time ....sorry i should have said that before.

I just ran Memtest86+Version 4.00 with each stick. I ran 2 passes on each stick and got no errors. Wtf. The problem does not seem to be the RAM. Corsair can't let me down. I think it's either my voltages or the CPU placement/tightening.
*I read in your thread that you disabled the Fast book up thing and it takes a bit longer to boot up with it detected ur RAM. Maybe i should try that tonight.
*Update I never went into Windows with each single stick I will try that tomorrow its to late now

today same problem. idk wtf to do anymore

Yes. I checked today. Of course on "cold start" 4Gb showed in BIOS. Then I shut the machine down and restarted it... Voila. 6Gb visible right away. Shut down the computer after that 10x. Every time it showed 6Gb. I am pretty sure that tomorrow when I turn the computer back on it will show 4Gb.
It always happens on "cold". Start very strange. I will contact zipzoomfly and RMA the memory.
Good luck everybody.

Seems like it's just. Probably some bios and comptability issues asus needs to fix

I guess I will RMA cause I got 2 more days left for RMA at newegg. RMA board and ram I guess and maybe CPU. but it costs money to ship back

frigenchigen-- Today I am sending in the RAM, motherboard, and CPU. All for replacement and costs 10.88 dollars to ship back via UPS Ground. They ship back via UPS 3day.

ok so i got my new ram and everything seems ok ...no blue screens and its all working @ specs ...only time will tell though, I will update you in a few days.