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5 RAMs but not 6

C

cfrpcopy

Junior Member
I have an DFI DKX58-T3eh6 that "supports" 24gb of ram in triple channel. I recently tried to upgrade to that, from 12gb of ram in triple channel, and it didn't work. However, 5 (20gb) does, as long as nothing's in the first slot. I installed the beta BIOS (that phrase scares me) that supposedly supports the 24GB triple channel.

Ok, it's possible something hardware-related has gone wrong, but i doubt it. I upgraded from the 12gb because it stopped working, but i (thought) i diagnosed it as a single bad module, and dropped down to 3x2gb, and never tried the 5.

This confuses me. Any ideas?
 
Did you check the list of compatible RAM for your mobo on manufacturer's site? Vrious makes and models of RAM have different electrical characteristics that can prevent them from working with specific board designs, especially when you're pushing for the max specs, in this case, using all six slots.

And you should be cautious with beta versions of your BIOS. "Alpha" is the name for first generation test versions of software, firmware, etc, and "beta" is the name for second generation versions before they're released as final versions. They're intended to find bugs before the product is publically released to consumers, and you always use it at your own risk.
 
DFI doesn't really do consumer motherboards anymore, and doesn't have anything over 2gb on it's supported list (it's a few years old now). i'd understand if it didn't work, but 5 of 6? I can only assume it's running in half triple channel, half double channel. I tried loosening the timings, didn't work.
 
cfrpcopy said:
DFI doesn't really do consumer motherboards anymore, and doesn't have anything over 2gb on it's supported list (it's a few years old now). i'd understand if it didn't work, but 5 of 6? I can only assume it's running in half triple channel, half double channel. I tried loosening the timings, didn't work.
Click to expand...

I'm an electronic design engineer, and I can think of a couple of reasons five could work, but six wouldn't:

1. Your particular model of RAM, or even just the RAM chips on your batch, requires a little more drive current than your motherboard is capable of supplying.

2. The added capacitance added by the sixth stick could slow the leading edges of the RAM signals enough to cause them to fail.

Either of these could be especially true for unbuffered RAM in which the system sees all of the RAM chips as loads on the drive circuitry.
 
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