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8gb installed available 4gb

  • Memory
Last response: in Memory
January 24, 2012 4:40:12 PM

Hey people, today i received my new memory, i purchased:

Corsair XMS3 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit

Now i already had the 4gb version of this with the intention of running both , so 12gb in total but my pc wont boot with all of it.

But also when i just use the 8gb it says only 4gb usable and the other 4gb "hardware reserved"

So firstly, am i able to run both at same time.
And secondly, how can i make it so it isnt reserved.

I currently use win7 64bit

And my motherboard can go handle upto 16gb of 1600mhz memory.

Hope someone can help, thanks

More about : 8gb installed 4gb

a c 146 } Memory
January 24, 2012 4:50:49 PM

Whats your mobo?

Do u have it installed in correct slot?
January 24, 2012 4:54:11 PM

My mobo is Asus P7P55D-E Intel P55 (Socket 1156) DDR3 Motherboard

And yeah there in the right ones
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a c 347 } Memory
January 24, 2012 4:57:48 PM

Boot with (1) stick then swap the stick; it's faster to rule-out a bad stick.

Q - What CPU?
January 24, 2012 5:00:29 PM

You got a bad stick of RAM
January 24, 2012 5:02:08 PM

will try that now, i use a intel i5 760
January 24, 2012 5:14:01 PM

Ok so ive tried it and it boots up with both of them individually, the only difference is that the 1 stick wont boot in the first slot unlike the other stick which will boot in either of them if that helps....
a c 347 } Memory
January 24, 2012 5:18:34 PM

No, 1 stick should use the 2nd DIMM slot from the CPU; DIMM_A1

Just to check, use only the following DIMM slots:
CPU: | blank | 4GB | blank | 4GB | ; Blue DIMM slots only

Intel Core i5-760 2.80 GHz

Assuming - CORSAIR XMS3 8GB (2 x 4GB) DDR3 1600 CMX8GX3M2B1600C9
9-9-9-24-2T @ 1.50v

Assuming - there's no bad stick.

AI Overclock Tuner -> Auto
DRAM Frequency -> DDR3-1600
DRAM Timing -> Manual
DRAM RAS to CAS -> 9
DRAM RAS PRE Time -> 9
DRAM RAS ACT Time -> 24
DRAM Timing Mode -> 2N
IMC Voltage -> 1.20v~1.25v
DRAM Voltage -> 1.50v~1.55v

If the problem persists then IMO update the BIOS to Version 1504 using ASUS EZ Flash 2:
EZ Flash 2 is a built-in App to allow the BIOS to be upgraded and USB Flash Drive is the storage for the BIOS ROM file to be stored/accessed from with BIOS EZ Flash 2. The USB Flash drive must be formatted in FAT-32.

Link ->
Video ->
January 24, 2012 5:20:55 PM

Yeah ive been using those slots will go check now... thanks