Is this a ram compatibility issue?

[CJMX]

Hi all,

Tried to upgrade RAM from 4gb to 8gb.

To make it more likly to be compatible with my motherboard, I went ahead and purchased the closest thing to what I currently have (no help with current QVL) I chose the same brand but got a slower speed (1333mhz 8gb instead of 1600mhz 4gb that I currently have and that 4gb works)

I installed the new RAM, started PC and it booted first time. I got into Windows, checked CPUZ and it said 8gb. Afterwards, I started Mozilla Firefox and then the computer restarted itself. I realised that I should make everything default in bios, so I made that and the bios screen frozen (that can't be a good sign?)

Since the bios frozen my computer could not start with the new ram in it. It didn't get a display signal on my monitor which is typical for incompatible ram.

This is what i've tried so far:

I tried clear cmos many many times with switch (refered to mobo manual for it)
Removed battery from mobo
used asus clear cmos buttons
used asus MemOK
I tried different gfx card
different monitor
unplugged everything but the gfx card, cpu and ram
tried one ram stick at a time
tried all ram slots individually and as a kit
unplugged every usb
tried different dvi, hdmi, vga cables

Yes my cmos did get cleared but still I could not even post with the new ram installed. It must be faulty ram?

Once I put my old ram back in the computer works fine, what's going on, does anyone have an idea? I mean if the ram is incompatible, why did my computer start the first time

My computer specs are here
Windows 7 ultimate 64bit
Mobo: Asus crosshair formula iii https://www.asus.com/ROG-Republic-Of-Gamers/CROSSHAIR_III_FORMULA/
PSU: OCZ700SXS2
CPU: AMD Phenom II 1055T
OLD RAM: Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX4GX3M2A1600C9) https://www.overclockers.co.uk/showproduct.php?prodid=MY-203-CS
NEW RAM:Corsair XMS3 8GB (2x4GB) DDR3 PC3-10666C9 1333MHz Dual Channel Kit (CMX8GX3M2A1333C9) https://www.overclockers.co.uk/showproduct.php?prodid=MY-328-CS
Gfx Card: AMD Radeon™ HD 6970 http://www.amd.com/en-gb/products/graphics/desktop/6000/6970#

Thanks for any help

 

[CJMX]

also, i do not know if i made it clear enough but im asking why doesn't the 8gb ram work? could it be faulty ram or incompatible ram?

if its incompatible, how comes it ran windows for 10 minutes?

 

[humbug]

I have had those Corsair XMS3 Modules in my Asus Sabertooth 990FX, 4 of them, not even matched pairs, one set were V-2 the other V-2.2 or 2.3 i can't remember exactly....

No trouble at all with them, your motherboard should run them.

 

[CJMX]

Thanks for the reply Humbug.

The ram i got is more likly to be faulty then. I'll wait a little bit longer before I return the ram to ocuk (just incase someone has any more helpful advice)

 

[humbug]

With the new set being 1333Mhz instead of 1600Mhz is the Motherboard running them at that speed?
The XM3 RAM profiling doesn't work on AMD Motherboards so the chances are it will run them at what it sees as default, 1600Mhz, and your 1333Mhz modules might not like that.