Lots of dimms not stable, why?

bexamous

[H]ard|Gawd
Joined
Dec 12, 2005
Messages
1,670
Well this might seem like a generic question but I'd really like to know the real answer other than, just because.

Why is it that when you use more sticks of ram the motherboard becomes less stable.

For example when you try overclocking with 4 dimms filled, you get worse results than if you just had 2 filled. If you test both sets of 2 individaully they both reach some speed, but with all 4 you cannot reach that speed.

At work we always have problems with getting 8GB of ram per cpu to work using 4 2GB sticks. Seems we always have to use the same brand/model number to be safe and even then sometimes there are problems that go away when switching brands of memory.

Or the extreme 128GB of ram in a 8cpu system, the mobo maker supports ONE brand/model number of ram, you have to buy it.

If all the sticks of ram support the same timings why does it matter what or how many sticks of ram you use?
 
More capacitors (MOSFET gates) loading down the memory bus and causing the signals turn on and off more gradually? Increasing the drive strength may help overcome this.
 
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