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Upgrading 4gb to 8gb problem

Last response: in Memory
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February 28, 2013 10:57:54 AM

Hi I am using an ASUS M5A78L-m/USB3 Mother board with 4 dimm slots. DDR3 PC3 12800 1600mhz. Using windows 7 64bit OS.
Currently 2 slots of 2gb being used. Just tried installing 2 x 2 more gb of same ram. Initially would only accept 1 of the extra ram and in windowes showed 6gb intsalled, 4gb usable. When try putting 4th in it just gets to windows boot screen and crashes(blue screen of death). I altered bios so that all ram settings eg remapping interlacing etc are auto and now i have windows saying 6gb available. But when i try install the 4th bit of ram it still crashes so wont accept full 8gb.

What confuses me though is before windows tries to boot is shows 8gb in bios when i put the 4th bit in!!

Argghh lol..
a b } Memory
February 28, 2013 11:20:41 AM

Have you tried the different RAM sticks in the 4th slot? Do you get the problem no matter which RAM stick you put in the 4th slot?
February 28, 2013 11:21:48 AM

Try to see if it happens with the SAME RAM module every time.
Also, try to see if it happens with the SAME DIMM slot on the mobo every time. That could help narrow down the culprit (RAM stick or DIMM slot on the mobo).
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February 28, 2013 11:48:30 AM

yer trying that now
February 28, 2013 12:00:47 PM

looks like a dodgy ram stick it wont work any slot or combination;!
February 28, 2013 12:13:25 PM

dburak said:
looks like a dodgy ram stick it wont work any slot or combination;!

Well, at least you got the answer. Glad it is the stick and not the mobo, though!
a b } Memory
February 28, 2013 12:15:11 PM

Glad you figured it out. Were you able to isolate which stick?

You can do so by booting with each stick only one stick at a time in the system.
February 28, 2013 12:39:43 PM

You might consider upping the RAM voltage a tiny bit beyond 1.5v because most RAM prefers 1.6v (or even 1.65v).
Of course this is no 'solution' if you in fact have a bad stick...
Also make sure your M5A78L is running the latest BIOS (which will enhance memory compatibility).
a b } Memory
February 28, 2013 12:49:02 PM

When TESTING:
a) read the motherboard manual as likely only ONE of the slots works with a single stick setup

b) run MEMTEST ( www.memtest.org ) and test each stick at a time.

* You should also make sure the BIOS is up-to-date, and that you apply the default XMP profile in the BIOS to auto configure your memory (I assume that's not possible if you have mixed memory).
February 28, 2013 12:56:29 PM

thanks..i am assuming iut wont make any harm that the ram is actually 1600mhz when the max supported by motherboard is 1333 i believe. the ram will just run at 1333 wont it??
February 28, 2013 1:05:58 PM

my mistake it takes 1600mhz anyway. j
a b } Memory
February 28, 2013 1:07:06 PM

You can up the clocks on the RAM to make it run at 1600mHz in the BIOS for most motherboards, but it's not worth it unless you want to squeak a little more out of it for synthetic benchmarks. For everything else, you won't even notice a difference between 1333 and 1600.

Also, if a motherboard supports faster RAM, it will usually show this on a RAM QVL and they'll advertise support for higher, but it sounds like your motherboard supports a max of 1333.
February 28, 2013 1:07:29 PM

yer defo bad stick cos even with only 1 slot used that stick causes error..ah well its getting sent back for replacement! cheers guys
a b } Memory
February 28, 2013 1:13:29 PM

Most companies have a lifetime warranty on RAM.

Hopefully this won't cost you anything?
!