Need help P55-UD5 Memory issue

[Bungral]

I need help / opinions.

I recently bought my Gigabyte P55-UD5 and I think it might have a fault with the memory slots.

Basically it has the slots layed out as follows

DIMM 2 ---- DIMM 1 ---- DIMM 4 ----- DIMM 3

The manual online says that you should populate DIMMs 1 and 3 for dual channel which I did and it booted fine. I have since realised that it was only picking up 2GB of my 4GB of RAM.

It reads DIMM 3 absolutely fine but not DIMM 1. I've swapped the modules over and get the same issue with both sticks... They both work in DIMM 3 but not DIMM 1.

As for DIMM 2 and DIMM 4, well if you put the memory in to either or both of those slots, then the PC doesn't boot... It just loops through the fan start up.

The really fun part is that if you have one stick in DIMM 3 (that works) and one in either DIMM 2 or DIMM 4 then it boots and but when you go System Properties, it says 4.00 GB (1.99 GB usable). I expect this is because they are on different channels.

Oh yeah before anyone thinks it, yes I am using Win 7 64bit.

So yeah, in summary, it looks like DIMM 1 is dead and the other channel doesn't want to boot at all with the memory in it.

Any ideas people before I RMA?

 

[Diablo]

Reset the CMOS, increase the voltage to the RAM and slow the clock speed down. I had this exact problem with my classified. Windows says 6GB detected, 4GB system reserved or somesuch.

Try booting with just one stick in the RAM1 slot and seeing if anything is picked up then.

If the CMOS reset doesn't help, it may well be RMA time.

 

[Bungral]

Cheers for the reply Diablo..

I had tried the CMOS reset as well as flashing the BIOS up and down a couple of versions to see if something in there didn't like my memory... Don't think it's a memory issue though to be honest as both sticks work in that one slot.

Tried one module in every slot and it only boots in that one good slot.

Hmmmm RMA it is then... Motherboard is the worst too... Especially when you've just spent some hours cabling everything up nice.

 

[Bungral]

Turns out it was the DIMM slot itself that was faulty... Send it to Gigabyte direct (couldn't be arsed with OCUK) Thursday 16th and had it back by Monday 20th.

Gotta love Gigabytes turn around times there.

 

[KapteinFruit]

Turns out it was the DIMM slot itself that was faulty... Send it to Gigabyte direct (couldn't be arsed with OCUK) Thursday 16th and had it back by Monday 20th.

Gotta love Gigabytes turn around times there.

Good to see it all worked out well.