Bios only showing 16gb of my 24gb of RAM

[ctark]

I plugged all the memory in and fired up the machine. it only saw 16gb and in the BIOS it says the last two DIMM slots are empty. These slots are known to be working because i had them all filled previously with 12gb of ram. The motherboard in question is an Asrock Extreme 3 x58.

I already flashed the BIOS. I also ran the sticks separately to make sure they were functioning. The manufacturer says this board supports 24gb of ram. The Ram I have is G.Skill DDR3 2000, and that speed is also supported by the motherboard.

Any idea's?

And yes, I needed a memory upgrade. I'm using at least10gb of memory at all times

 

[Iron Woode]

could this be the answer?

Due to Intel® CPU spec definition, XMP DIMMs and DDR3 2000/1866/1600 are supported for one DIMM per channel only.

 

[ctark]

could this be the answer?

Well I went and looked after you mentioned it and there is an XMP setting in the BIOS. It has two options:

Auto
Profile 1

It was on auto and i put it on profile 1 and rebooted and it saw all 24gb YAY

Now I need to figure out why my machine reboots when I try to set the speed to DDR 2000

 

[VirtualLarry]

I would just be happy that it all works, quite frankly. I've seen tons of problems from people that fill all of the slots on an X58 motherboard. If you get everything working, then be happy. Higher mem speeds are just gravy, and I'm pretty sure that DDR3-2000 speeds, are NOT going to happen, with 24GB of RAM. The memory controller on the CPU just can't handle that.

 

[bankster55]

I would actually be a bit curious as to actual RAM in usage
i know X58 supports 24, I assume you are X64 Win 7
What does it say in taskmanager/performance?
Inquiring minds want to know

 

[Arcanedeath]

I have 24 GB and currently just at the windows desktop w/ my normal crap I only use 2.3GB much more gets used when encoding and doing Photo shop which I just got into really heavily recently.

 

[BathroomFeeling]

Much more like around...? I'm deciding whether to stick with 8GB or go higher.

 

[Arcanedeath]

Much more like around...? I'm deciding whether to stick with 8GB or go higher.

I depends on how may layers and how many projects I have open at once but I've used up to 20.2 GB at once so far as a test w/ the right settings in PS I can pretty much use as much as I want.

 

[Rubycon]

Try 12GB using three slots first.
Re-seat all memory.
You may need to remove your cooler, cpu and re-install again. Some boards/memory types are problematic with all six slots in use.

 

[Arcanedeath]

Try 12GB using three slots first.
Re-seat all memory.
You may need to remove your cooler, cpu and re-install again. Some boards/memory types are problematic with all six slots in use.

You may also want to try raising the CPU VTT and vDimm a bit, I would drop 4GB and be down to 20GB when soft resting unless I raised vdimm to 1.55 & CPU VTT to 1.29 I used to run 6GB of Corasir C8 w/ 1.65 and 1.35 CPU VTT seems like my chip needs more VTT to run the memory stable, You might need the same.

 

[bankster55]

Rather interestingly, I am gonna get the Asus P67 deluxe mobo ($235) and looking at the specifications tab it says it supports 32GB RAM - 8GB per slot, and they will update the qualified list when the modules come out.
Bet they are gonna be real expensive.
The mobo also has sep volt circuit just for mem and includes "memory O.K." that will make more sticks usable and less fussy.
http://www.asus.com/product.aspx?P_ID=FpufhQASBFHNvccl

Intel® P67 Express Chipset Memory 4 x DIMM, Max. 32 GB, DDR3 2200(O.C.)*/2133(O.C.)/1866(O.C.)/1600/1333/1066 Non-ECC,Un-buffered Memory
Dual Channel memory architecture
Supports Intel® Extreme Memory Profile (XMP)
* According to Intel® SPEC, the Max. 32GB memory capacity can be supported with DIMMs of 8GB (or above). ASUS will update QVL once the DIMMs are available on the market.
* Hyper DIMM support is subject to the physical characteristics of individual CPUs. Some hyper DIMMs only support one DIMM per channel. Please refer to Memory QVL for details.
* Due to CPU behavior, DDR3 2200/2000/1800 MHz memory module will run at DDR3 2133/1866/1600 MHz frequency as default.
* Please refer to www.asus.com or user manual for Memory QVL.