OK...just built an i7 system, now what's going on? Only 4GB out of 6GB showing......

[DavyBoy]

I also experience this exact same issue on my i7 rig... when I first built it, all 6GB was being recognized no problem, but one day I fired it up and it would only see 4GB, I then tried swapping ram around in different order, but nothing worked..

It is also the first slot on my mobo that fails to see the installed ram, so I like you guys had thought that it was a dead DIMM slot on the mobo, and went ahead and RMA'd the mobo, well they tested my board with 6GB and 12GB and it worked fine, so I got it back again, only to find that it was still only detecting 4GB..

I have two different sets of tri channel DDR3, and it does this with both sets.. I have also tested each module individually with memtest boot disc, and they all ran for 20+ passes without a single error at their rated spec...

I was still positive that I had a dead slot on my mobo, and that it was an intermittent fault, because some days I could turn on my system and in would see all of the installed RAM, but that would only last for a couple of hours at the most before going back to seeing 4GB, so I went and bought yet another UD5 mobo, and again the EXACT same problem happened on my brand new board!!!

I have tested my gear with as many different hardware configurations as possible, as I have 3 gfx cards, 2 sets of RAM, 2 UD5 mobos, 3 SATAII HDD's, 2 PSU's, and I also changed over all my SATA cables incase it was dodgy leads that was causing these problems, and no matter what hardware configuration I used this problem is always present, and the only piece of hardware that hasn't changed with each configuration is my processor...

I found a thread on the Corsair support forums, where 2 other people were having this problem with their rig, they were both using different mobos as well, an Asus RIIE, and P6T Deluxe I think it was, and one of the guys ended up changing his CPU and that sorted it out for him!!

I have been suspecting the IMC on my processor as the culprit as well, because like I said, I have changed over all other pieces of hardware, and the problems still persist...

I'm getting another i920 D0 next week hopefully, so then I will know for sure if it is my processor that is bricked.. though I am quite confident that it is...

Another thing that can cause this to happen is bent CPU socket pins.. I read a thread on OcUK forums where someone was experiencing this, and he had a bent pin in his socket, he straightened it out, and the problem dissapeared...

I wish that it was a bent pin that was causing my issues, because I hate RMA'ing hardware, but I have checked the sockets on both of my mobos 1000's of times, and there are no pins out of line at all on my boards...

Anyway, I will post back here to let you guys know how I get on with this issue...

Have any of you found a fix?

::edit::

@rioja, I to thought that it could have had something to do with the load plate in the CPU socket, because on both of my UD5's, they take quite a bit of pressure to close.. I was quite scared the first time I had to push down the bar to lock it in place... How could I go about loosening the load plate so it doesn't take the same amount of pressure to close?