hi.. i dont know if this is the appropriate place to ask but,,
recently i tried overclocking my ram @ 1900hz
and when i boot in the windows it only shows 2gb available ram. and sometimes 1gb.. while in cpuz it states that i have 3gb of ram available

i have 3 ram modules which are 1gbX3 ddr3

my specs

Asus P6T
Corsair Dominator 1X3GB 1600hz XMP PROFILE
Core i7 920

Your motherboard might not be able to fully support such high clock settings. Try flash the BIOS to the latest version.

1900hz is too low.. its 1900megahz

lol... must be typo.. try flashing bios 1st..

might be bios.... if i m not mistake there i have experience this before, forgot it was fixed in latest bios or not.

hurmm, ive tried w/ different timings but still it doesnt work

This post has been edited by lightonokira: Dec 24 2009, 11:35 PM

flashed the latest bios,

still my attempt on 1900 seems to cut my 3gb ram to only 1gb

Manually set vDIMM to 1.65v +/-

done that mate

oo managed to recall my P6T, this board is indeed has ram issue when OCed. If default speed & timing confirm no prob but u hv to set everything manually.
solution: RMA it or sell off/throw it

---

Added on December 25, 2009, 3:22 pmgoogle for p6t ram issue dude there's a long list

This post has been edited by owikh84: Dec 25 2009, 03:22 PM

ahahaha im one of them previously,but not to say ram issue on the p6t but more to ram issue itself and to make it worse happen to my dominator cl8 before..slight voltage adjustment equal to lost of 1 0r 2 stick ram..

well my problem solve after getting new ram cl7 dominator actually, so i guess its the ram is the culprit since it can run on its designated speed of 1600mhz cl7 or cl 8 on 1.56v(my old cl8 stick) but if bump the voltage to higher you start seeing loss of ram..
or even overclock the ram hogher then 1600 equal the same..so i guess cl8 dominator 6 gb kit was not compatible to p6t coz my cl7 dominator 6gb kit perform flawlessly on the same board..

mine is also cl81x3gb dominator when bumping the voltage or ocing on stock voltage this happens

When the loss of ram? What your setting for vDimm & vTT?

vDimm - vTT < 0.5

-pWs-

vdimm 1.66

vtt 1.28750 iirc

ram running at 2000mhz succesful boot but not yet stable..

and the available ram is only 1gb instead of 3gb

How if you increase ur vTT to around 1.3x v?

-pWs-

i tried that.. still it doesnt work..

will try it again at home..

i was wondering wether its a ram or mobo problem..


This post has been edited by lightonokira: Dec 27 2009, 08:25 PM

http://forum.corsair.com/forums/showthread.php?t=77394

http://vip.asus.com/forum/view.aspx?id=200...SLanguage=en-us

http://vip.asus.com/forum/view.aspx?id=200...SLanguage=en-us

http://vip.asus.com/forum/topic.aspx?elite...age=1&count=568

it seems alot of people are having the same problem..

what can i do now? i think its not worth it to wait 2-6 weeks for RMA

cause it might just happen again..

help me i just bought this mobo almost a month already

This post has been edited by lightonokira: Dec 27 2009, 08:26 PM

Last time I hv to set the Corsair Dom 1600C8 RAM timing to 7-8-7-20-1N then only it works. vDIMM was auto.

http://forum.lowyat.net/index.php?showtopi...post&p=25776868

so what should i do now?

should i just send them both for RMA or what?

RMA is always the last resolve.
Try the tighten RAM timing 7-8-7-20-1T
Could be P6T hate CL8?

ugh.. i just bought the mobo and my first Asus..

makes me really Sad..

gigabyte never had this kinda problem..

dfi is the most stable ram oc'ing board.. hahahah maybe u should try 'em...

most stable.. but the price is out of my league..

i also have this problem when i try to OC my KVR from DDR3 1333 to DDR3 1700 or above, CL9...

if CL8, I will have problem when reaching DDR3 15xx.

if CL7, I will have problem when reaching DDR3 14xx.

The lesser ram detection problem only occurs when I run my ram out of spec. But still can OC, luckily didnt buy high end expensive ram for the board. Seems the board not so good in Ram OC.

Just bought my brand new DFI DK x58 for RM690 only
I think P6T is RM850. Btw KVR 1333Mhz CL9 3GB also sometimes appeared as 1GB on my old P6T too.
It could be compatibility issues btween the mobo & RAM.

i just did some testing last night..

it seems there was some problem with the ram..

this is what i did

1st i oced the rams to 1800mhz

and then the usual problem it says only 2gb of ram available via bios..

next i tried to unplug one by one to see which one is making problem.. and hence i found one bad ram..

then i tested all the slots with the good ram just to see whether its a mobo or ram problem.. and there you go..

its a ram problem.. i think..

gonna test with memtest tomorrow

Last time I also swapped the rams between the slots to make it work.
no ram error though.

where did you get ur dfi mobo.. so cheap

from a lyn mod Lacus, i don't think u can get it that cheap or it's sold out already atm..
as for the ram u can send it to me for testing.
pmed u.

i really have no idea now.. last night i conducted a test again..

1804mhz @ 9-9-9-27-2N @ 1.66v
UCLK V @ 1.35
VCORE @ 1.28750
IOH n ICH @ 1.2

successful boot at 2gb only.. actual ram 1024MB*3

Test Passed
--------------
Memtest86+

superpi failed at 32mb loop 4..

the stability doesnt matter..

my curiosity is more towards the incorrect ram size shown

OS Windows 7 64bit..

try other mobo bro. p6t is a bad board

dont have any friends with x58 mobo

pmed clawhammer.. waiting for his reply

lol... gotto agree p6t quite picky for ram and lousy in ram OC.

But during the old days, p6t were one of the bang of buck board with SLI + CF, but not now especially all those DKs year end clearing sales. I might wait till next year for the new DK with USB 3.0 before swapping my p6t since not so worth if go for DK now juz for additional OC headroom without any new features like USB 3.0.

so for all p6t user better not invest too heavily on good ram... feel the frustration of TS after invest in good ram.

i am frustrated by p6t, everyone seems to recommend it but this shyte is what i get..

im gonna swap this mobo for something else, yes USB 3.0 capable mobo maybe.. gonna try DFI