Why wont 32Gbs work??

sou7hernsaint · Jul 26, 2017

Hi all,

I built my PC in 2011 and have used four sticks of 4gb RAM until this week, when I bought new 8gb sticks (four of them).
When i tried to install today, my system
1. wont boot/pass with three or four sticks set to profiles 1 or 2
2. wont finish loading the OS (win 7) w/ ram set to 'default'
3. BUT running 3 sticks in any slots at default settings is successful, and CPU-Z sees all 24gb's ...

is this a power issue? a bios issue?

Solutions already tried:
installing sticks one at a time, in different slots, and swapping them around
Contacting Mobo support: they say that it's a CPU issue, and that my i7 may be unstable?

OS: Win 7 64bit Professional, Service Pack 1 (w/ latest updates)

CPU: i7-2600k 3.4GHz
Mobo: GIGABYTE GA-Z68XP-UD5 (bios v1)
Ram:
(former) G.Skill Ripjaws X DDR3 2133 (F3-17000CL11D-8GBXL)
(new) G.Skill Ripjaws X DDR3 2133 (F3-2133C9D-16GXH)
GPU: EVGA Titan 1080 FTW
SSD: Samsung 840 Evo 1TB

Thanks for any assistance in advance!!

Slow Pri · Jul 26, 2017

Maybe it's the motherboard itself or it's even the CPU. However, I think it's more of a motherboard issue to be honest.

Have you tried updating your BIOS?

JackNaylorPE · Jul 26, 2017

newegg lists the following data for your board...

Memory

Number of Memory Slots
4×240pin

Memory Standard
DDR3 2133/1866/1600/1333/1066

Maximum Memory Supported
32GB

1. Does your newly purchased RAM meet those requirements ?

2. Do you have the latest BIOS ? / Have later BIOS provided additional RAM support.

3. When you look in BIOS do the settings for speed, and timings match those on the package ?

4. Was the new RAM purchased with all 4 sticks in the same package ? Do the settings match the SPD ?

5. Did you clear CMOS after installing the new sticks ?

6. Has each stick passed memtest 86+ (12 hours)

boosted1g · Jul 26, 2017

Your new ram is 1.6V and the board uses 1.5V memory

JackNaylorPE · Jul 26, 2017

The board uses DDR3 which

Code:

is absolutely fine with any Z97 board made by any of the manufacturer's listed. 1.5v applies to the JEDEC compliant SPD settings, not XMP which will require higher voltages.

The MoBo supports XMP

https://www.gigabyte.com/Motherboard/GA-Z68XP-UD5-rev-10#sp

Original RAM
Series RipjawsX
Memory Type DDR3
Capacity 8GB (4GBx2)
Multi-Channel Kit Dual Channel Kit
Tested Speed 2133MHz
Tested Latency 11-11-11-30-2N
Tested Voltage 1.50v~1.60v
Registered/Unbuffered Unbuffered
Error Checking Non-ECC
SPD Speed 1600MHz
SPD Voltage 1.50v
Fan lncluded No
Height 40 mm / 1.58 inch
Warranty Lifetime
Features Intel XMP (Extreme Memory Profile) Ready

New RAM

Series RipjawsX
Memory Type DDR3
Capacity 16GB (8GBx2)
Multi-Channel Kit Dual Channel Kit
Tested Speed 2133MHz
Tested Latency 9-11-11-31-2N
Tested Voltage 1.60v
Registered/Unbuffered Unbuffered
Error Checking Non-ECC
SPD Speed 1333MHz
SPD Voltage 1.50v
Fan lncluded No
Height 40 mm / 1.58 inch
Warranty Lifetime
Features Intel XMP (Extreme Memory Profile) Ready

I did notice that the memory support list included models only up to 4 GB in size. This simply means that someone paid to have these models tested ... the board officially supports 32 GB in 4 slots.

http://download.gigabyte.us/FileList/Memory/mb_memory_ga-z68xp-ud5.pdf

Gigabyte certified GSkill F3-19200CL9D-4GBPIS and F3-18400CL8D-4GBPIS for this board, both of which are rated at 1.65 volts

https://www.newegg.com/Product/Product.aspx?Item=N82E16820231338

https://www.newegg.com/Product/Product.aspx?Item=N82E16820231337

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