Uses only half of the available RAM in the Asus X99 system.

Z

Zyrn
Member

54

11-08-2016, 10:37 AM

#1

Collected a few used X99 boards bundles recently, exchanged parts I needed and sold the rest. After installing what I thought was a 32GB kit (8x4GB), I discovered it actually contained two 16GB (4x4GB) kits. The Asus X99 Deluxe II (i7-5960X) board I kept doesn’t recognize both kits at the same time. Both kits are fully operational, and all memory slots are detected—double checked everything—but the system still can’t detect both being connected. The kits are identical (Corsair LPX 2133MHz 16GB). I’m puzzled about what might be wrong. I thought this was a quad-channel motherboard and possibly misremembered the installation sequence. I searched for a 16GB (8x2GB) kit but found it hard to locate, and several fixes I tried didn’t resolve the issue. Could there be something obvious I’m missing? TLDR: Bought an Asus X99 Deluxe II motherboard, have two working 16GB (4x4) Corsair LPX kits that won’t work together when plugged in, and I’m unsure if I’m doing it wrong. Am I missing a simple step? Open to suggestions.

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iHashASF
Member

229

11-10-2016, 06:00 AM

#2

It might be overcomplicating things, but your boards aren't quad-channel, so they don't require quad-channel memory to use all their features. What you bought seems to be dual-channel. Let me know if that's correct.

F

FieryExile_
Member

231

11-18-2016, 08:41 PM

#3

No system offers dual or quad channel RAM configurations.

C

c_x_y
Member

227

11-21-2016, 06:36 PM

#4

DRD stands for Duel Dissipation RAM, which is a real feature that boosts performance. The Duel Channel ensures you experience the full speed without needing extra steps.

K

Kaisetsu
Senior Member

651

11-21-2016, 07:13 PM

#5

I also located the proper settings for the channels, I’ll check if ordering the dimmers in alphabetical order makes a difference.

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timo_1892
Senior Member

715

11-22-2016, 02:32 AM

#6

They function at maximum performance consistently. The dual-channel feature isn't about memory speed but manages data traffic efficiently.

P

psychiiik_king
Member

143

11-23-2016, 10:07 PM

#7

It should have been Slots A1, B1, C1, and D1 filled with four sticks as per Asus guidelines. I’m not sure if you applied that setting yet, but I wanted to confirm.

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camiepan
Junior Member

44

11-26-2016, 09:34 AM

#8

I followed the configuration guide on the board. I placed the dimmer units numerically using their serial suffix numbers that matched the kit codes (36 through 43). Then I arranged them in the designated slots: A1/36, B1/37, C1/38, D1/39, A2/40, B2/41, C2/42, D2/43. Only C1 and C2 were filled, while D1 and D2 remained empty. Any suggestions?

A

Askir152
Member

63

11-28-2016, 12:10 PM

#9

Curious about trying a BIOS reset? Just to reset any previous user settings. It occurred to me. Another point is to ensure XMP remains disabled until everything stabilizes. By default, it should be off. I’ll keep exploring.

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TheMaxish
Junior Member

20

11-28-2016, 09:08 PM

#10

I'm experiencing several BIOS resets. I plan to reinstall the CPU tomorrow to see if that resolves the issue.