Asus A88XM-A Ram orientation & post code external speaker wiring

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syntheman

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Jan 4, 2015
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I have built a desktop system about 9 years ago. I'm trying it again. But have some questions.
I have been reading a fair amount on this forum. I have tried finding info here, and online searching, and don't see anything that makes it clear. I am trying to figure out ram install orientation. I have 4 ram slots. 2 sticks of matching ram 8GB a stick.

Left to right:

1st Black slot: Dimm A1, 2nd Yellow slot: Dimm A2, 3rd black slot: Dimm B1, 4th Yellow slot Dimm B2

Asus tech says says use A2 & B2 which are 2nd yellow slot, and 4 yellow slot. Then later on I could fill the other black slots at A1, B1

I get confused with channel, bank terms etc.

I also need a post speaker and had an old motherboard post speaker I removed. I would like to solder some leads to the speaker and use it instead of buying one. The speaker pins show
pin #1 +5, pin #2 GND, pin #3 GND, pin # 4 speaker out.

I see pics showing a post speaker with 4 terminal connector with a red and black lead on outer pins. Does speaker + go to pin 1 +5V, and speaker - to pin 4 speaker out, or vice versa?

They are not expensive to buy, but I'm cheap, and like to learn.

Thanks Pat
 
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volcanoscout

volcanoscout

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Jan 5, 2014
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Oversimplified, channels are the paths used by the CPU to access the DIMM slots, and by extension the DRAM. Banks are the DIMM slots allocated per channel. A1 and A2 are one bank on one channel, with B1 and B2 for the second channel. By filling A2 and B2, you are matching the banks on each channel and giving your CPU dual-channel access to your DRAM, which makes it happy. If the banks are not matched, i.e. you put a single stick in A2 and leave the others open, the system defaults to single channel mode, which will work but chokes the CPU's DRAM access. If you put three sticks in, the same thing happens because the banks don't match. You'll have more overall capacity (12GB vs 8GB or 4GB), but you lose the dual channel access. So for two sticks, optimum performance will be from A2/B2, or the second and fourth slots (yellow).

As for the speaker, you are correct - speaker positive to the +5 pin and speaker ground to the Speaker Out pin. I would try it with alligator clips first to verify that it works before soldering. Careful with the soldering also - don't want to melt anything other than the solder being applied:)
 
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syntheman

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Jan 4, 2015
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So I'll go for the yellow slots. Then maybe in the future I can use the other slots. Yes I'll be careful on the soldering. I'll just solder the speaker to an old terminal harness that will plug into the speaker pins coming off the motherboard. I'll put some heat shrink over the bare terminals on the speaker and mount it somewhere close by. I worked for my brother in law at his old company and learned to solder competently from some of the techs while there.

Thanks for the warning on melting, and of course answers to my main questions. I'm sure I'll have some other questions going forward. Thank you
 
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