Asus P8 Z77-M Pro ram issues

[mickrick]

I've just bought an Asus P8 Z77-M Pro board as the basis for my Home Cinema PC. Its running an i7-2600K and there are no addon cards. The only problem I have is with the ram sockets. I have 2x4gb Hynix DDR3 1600 modules, a Kingston 2gb 1600 module and a 2gb SpecTek 1600 module. The board boots ok when any combination of ram is in sockets B1 and/or B2 but it will not boot at all if there is any ram in sockets A1 and/or A2.

I have run each module through the onboard MemOK! system in both sockets but the board just will not POST.

The only other thing I can think of is that my psu only has a 4-pin atx cable while there is an 8-pin socket on the board, but the board manual makes no reference to this other than to say that the 4 or 8 pin connector has to be connected for the board to power up.

Ideas or suggestions please?

 

[vicstead]

I've just bought an Asus P8 Z77-M Pro board as the basis for my Home Cinema PC. Its running an i7-2600K and there are no addon cards. The only problem I have is with the ram sockets. I have 2x4gb Hynix DDR3 1600 modules, a Kingston 2gb 1600 module and a 2gb SpecTek 1600 module. The board boots ok when any combination of ram is in sockets B1 and/or B2 but it will not boot at all if there is any ram in sockets A1 and/or A2.

I have run each module through the onboard MemOK! system in both sockets but the board just will not POST.

The only other thing I can think of is that my psu only has a 4-pin atx cable while there is an 8-pin socket on the board, but the board manual makes no reference to this other than to say that the 4 or 8 pin connector has to be connected for the board to power up.

Ideas or suggestions please?

 

[vicstead]

In my limited experience, if you wish to install 4 sticks of RAM and they are not matched, they will fail to work together.
In the past I purchased 2 sticks of Corsair RAM which worked perfectly. When money allowed I added another 2 sticks of RAM of exactly the same size and part number. Both sets worked perfectly on their own but not together. It turned out that they were different batch numbers. If you view the Corsair site and scroll the RAM Guy advice you will see what I mean.
I suggest that you buy 2 sticks of matched RAM to give you the overall size that you require or purchase 4 matched RAM sticks.

Vicstead.

 

[ihog]

While mixing RAM is a bad idea, it should at least post, though it could be the reason. Make sure the frequencies and timings are the same in the bios if you ever get it to work.

But, my first assumption as to why the "A" slots don't work is that there are bent pins in the CPU socket. Check the CPU socket for any anomalies.