BIOS Only Reads 2 Sticks of Ram But I have 4

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KVegi

KVegi

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Jan 6, 2017
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Nutshell:
1. Originally had 2x8 16gb ram [Corsair Vengeance 2400 LPX] ran completely fine
2. Upgraded my ram today to 64 gigs [Corsair Vengeance LED 4x16 3200]
- All sticks light up so there is power to them..
3. BIOS only recognizes 2 sticks, windows only reads 32gb total, Corsair link and CPU- Z recognizes all 4
- CPU-Z recognizes that its totaled to 64
- CPU-Z sees ram on a *DUAL CHANNEL* (shouldn't it be quad?)
4. Task manager GPU says https://gyazo.com/0a2bf3aa8a433a7963022cf1fd4b7fe3
- So I guess 16 out of my 64 went to gpu? If so, where is the rest of my left out memory going to?
5. Updated bios, nothing changed. Reseated CPU and cooler, nothing changed.

So what do I do to fix this?

Specs and other details
MOBO: Asus X99-AII (128 gb memory supported and I plan to add another 4 sticks of 16 soon.)
- Put in XMP mode once with the original 2 sticks, then turned off XMP mode
CPU: I7-6800K (Never OC'D)
GPU: GTX 1060 6GB (I think it had 8 gigs or something of shared memory with original 2 sticks. now it has 16 holy moly)
CPU Cooler: Corsair h115i
RAM: Corsair Vengeance LED 4x16 3200mhz
Storage: 2x120 Kingston SSDs, 4tb Seagate Constellation, 4tb Seagate Extermal Expansion HD
PSU: EVGA SuperNOVA ATX 750w Bronze
OS: Windows 10 Home

Ram Slots used
DIMM A1
DIMM B1
DIMM C1
DIMM D1

That is also the *recommended* set up on the mobo manual. Since it says *recommended* I can use it in another way?
 
Solution
mjslakeridge
You said above that you turned XMP off. To run the new RAM at the rated speed, you will probably need XMP on. It may take a while to do, but I would run Memtest 86+ on each stick of RAM in whichever slot the motherboard manual recommends for using a single stick. That would rule out a faulty RAM stick, which would be pretty unlikely since RAM bought in kits is tested together before being shipped out.
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KVegi

KVegi

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Jan 6, 2017
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Just did it, thanks. Now 3 sticks of ram is being recognized. All 4 still light up. DIMM C1 still isn't showing up in the BIOS.
 
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mjslakeridge

mjslakeridge

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Mar 6, 2013
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You said above that you turned XMP off. To run the new RAM at the rated speed, you will probably need XMP on. It may take a while to do, but I would run Memtest 86+ on each stick of RAM in whichever slot the motherboard manual recommends for using a single stick. That would rule out a faulty RAM stick, which would be pretty unlikely since RAM bought in kits is tested together before being shipped out.
 
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Solution
KVegi

KVegi

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Jan 6, 2017
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I got it to work. I download MEMTEST86 and seen that it only read 48gb out of my 64gb. From that, it was common sense that one of the ram sticks weren't seated properly (DIMM C1) even though the LED was still on. I reseated it and got it to work. Thanks to everyone for the support.

Here is all the steps/procedures I took that fixed this problem that might can fix others with the same proble
- Reseat CPU/CPU Cooler
- Clear CMOS
- Run XMP mode
- Test with MEMTEST86
- Reseat ram
 
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mjslakeridge

mjslakeridge

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Mar 6, 2013
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Great news! I never though about one of the sticks not being seated properly, since you said CPU-Z showed all 64 GB.

As to your question about dual channel vs quad channel, it depends on what the motherboard supports. It is certainly possible to run 4 sticks in dual channel (2 sticks per channel). There may be a setting in your BIOS to select quad channel if the motherboard supports it. But that could put more stress on your CPU's integrated memory controller. I would think you would get pretty good results in dual channel with that high speed RAM.
 
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