4GB instead of 6GB detected (x64, Asus P6T)

[Keth]

As far as I remember, when I bought the PC, 6 GB of DDR3 Ram was detected.
However, I did not notice when (probably after few days or weeks) it stopped working.

There are 3 x 2 GB Corsair's 1333 MHz (6gb in total) in the orange slots.

I've been flipping them around to different slots to check if it it's the ram stick issue or slot.
After 15 minutes I determined it's the first orange slot from the left that is not working. I'm not sure what's could be the reason.

I'm able to put the stick into black colour slot and 6GB is detected but I'm still not sure about few things.

My questions are:

1. What's the difference between orange slots and black slots? If so, please explain.
2. Does it affect overclocking (i7 + rams) because as far as I know when I got 4gb RAM it's not called triple channel anymore.
3. Is there any difference between putting (2 sticks of ram to 2 orange slots) and (3 sticks of ram to 2 orange slots and 1 black slot)?

 

[Keth]

Hi, sounds like the mobo is faulty then so you should arrange an RMA for it
In the mean time, theres no difference between the orange and black slots as such, but to keep it running in triple channel then they should all be in one colour or the other, as the first orange one is borked, use all the black ones, if you mix and match then yeah it will only run in single channel mode
Hope this helps

So, you said it runs on "single channel mode". Does it means I might find it harder to overclock i7 than in triple channel mode?
I've heared triple channel makes overclocking better?

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Have you tried 1 stick of ram at a time and making sure each one works one by one, make sure it's the mobo.
If it's a broken orange slot you should RMA it, even if all the black slots work, if one thing has gone wrong with the board then who knows what could go next, best to get a new one while you can.

Yes, it is motherboard for sure. I checked all the sticks one by one, all of them are working.

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I got this problem when i overclocked too much. If it is overclocked reduce the clock speed otherwise reduce latencies.

Make sure the ram voltage is right. Try 1.64v

I will try, thanks.