only 2 out of 4x4gb corsair vengance usable on my Asus M5A97 R2.0?

bartosz.borczynski

Prominent
Jan 5, 2018
3
0
510
Saw a bunch of similar problems but no solution worked for me. Maybe because they were not exactly alike.

Bought an additional 2x of 4gb corsair vengance and slotted into my Asus M5A97 R2.0.
The first pair works no probs. the second one is visible to both BIOS and Windows 8.1 but not usable.

The RAMs are fine - I switched them with the other ones and they work as 8gb just fine. It's only when all the 4 slots are taken, only the first two ones are used.

I cleared the CMOS, set the freq to 1600, vol to 1,5V, DRAM timing to 9-9-9-24 removed the max memory tick in the Win msconfig. No luck with any of that.
Any other ideas?
It feels like a motherboard/BIOS settings issue.

Much appreciated!
 
Memory is guaranteed in the form sold and not by combinations made from matching up identical part numbers.

Additional stress on the memory controller may cause the memory to be unable to run at 1600MHz any longer.

Workarounds to get extra memory to work include:
Lower memory frequency
Increase DRAM voltage
Relax DRAM timings
Lower CPU multiplier
 

bartosz.borczynski

Prominent
Jan 5, 2018
3
0
510
If that's of any help, my Web Speccy is:
http://speccy.piriform.com/results/sWhZpy5pEmuREJQOZhMhHba

The RAM specific section is:
Memory slots
Total memory slots: 4
Used memory slots: 4
Free memory slots: 0
Memory
Type: DDR3
Size: 16384 MBytes
Channels #: Single
DRAM Frequency: 802.5 MHz
CAS# Latency (CL): 11 clocks
RAS# to CAS# Delay (tRCD): 11 clocks
RAS# Precharge (tRP): 11 clocks
Cycle Time (tRAS): 28 clocks
Bank Cycle Time (tRC): 39 clocks
Physical Memory
Memory Usage: 33 %
Total Physical: 7.90 GB
Available Physical: 5.29 GB
Total Virtual: 16 GB
Available Virtual: 13 GB
SPD
Number Of SPD Modules: 4
Slot #1
Type: DDR3
Size: 4096 MBytes
Manufacturer: Corsair
Max Bandwidth: PC3-10700 (667 MHz)
Part Number: CML8GX3M2A1600C9
SPD Ext.: XMP
Timing table
JEDEC #1
Frequency: 457.1 MHz
CAS# Latency: 6,0
RAS# To CAS#: 6
RAS# Precharge: 6
tRAS: 17
tRC: 22
Voltage: 1,500 V
JEDEC #2
Frequency: 533.3 MHz
CAS# Latency: 7,0
RAS# To CAS#: 7
RAS# Precharge: 7
tRAS: 20
tRC: 26
Voltage: 1,500 V
JEDEC #3
Frequency: 666.7 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
tRC: 33
Voltage: 1,500 V
XMP-1600
Frequency: 800 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
Voltage: 1,500 V
Slot #2
Type: DDR3
Size: 4096 MBytes
Manufacturer: Corsair
Max Bandwidth: PC3-10700 (667 MHz)
Part Number: CML8GX3M2A1600C9
SPD Ext.: XMP
Timing table
JEDEC #1
Frequency: 457.1 MHz
CAS# Latency: 6,0
RAS# To CAS#: 6
RAS# Precharge: 6
tRAS: 17
tRC: 22
Voltage: 1,500 V
JEDEC #2
Frequency: 533.3 MHz
CAS# Latency: 7,0
RAS# To CAS#: 7
RAS# Precharge: 7
tRAS: 20
tRC: 26
Voltage: 1,500 V
JEDEC #3
Frequency: 666.7 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
tRC: 33
Voltage: 1,500 V
XMP-1600
Frequency: 800 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
Voltage: 1,500 V
Slot #3
Type: DDR3
Size: 4096 MBytes
Manufacturer: Corsair
Max Bandwidth: PC3-10700 (667 MHz)
Part Number: CML8GX3M2A1600C9
SPD Ext.: XMP
Timing table
JEDEC #1
Frequency: 457.1 MHz
CAS# Latency: 6,0
RAS# To CAS#: 6
RAS# Precharge: 6
tRAS: 17
tRC: 22
Voltage: 1,500 V
JEDEC #2
Frequency: 533.3 MHz
CAS# Latency: 7,0
RAS# To CAS#: 7
RAS# Precharge: 7
tRAS: 20
tRC: 26
Voltage: 1,500 V
JEDEC #3
Frequency: 666.7 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
tRC: 33
Voltage: 1,500 V
XMP-1600
Frequency: 800 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
Voltage: 1,500 V
Slot #4
Type: DDR3
Size: 4096 MBytes
Manufacturer: Corsair
Max Bandwidth: PC3-10700 (667 MHz)
Part Number: CML8GX3M2A1600C9
SPD Ext.: XMP
Timing table
JEDEC #1
Frequency: 457.1 MHz
CAS# Latency: 6,0
RAS# To CAS#: 6
RAS# Precharge: 6
tRAS: 17
tRC: 22
Voltage: 1,500 V
JEDEC #2
Frequency: 533.3 MHz
CAS# Latency: 7,0
RAS# To CAS#: 7
RAS# Precharge: 7
tRAS: 20
tRC: 26
Voltage: 1,500 V
JEDEC #3
Frequency: 666.7 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
tRC: 33
Voltage: 1,500 V
XMP-1600
Frequency: 800 MHz
CAS# Latency: 9,0
RAS# To CAS#: 9
RAS# Precharge: 9
tRAS: 24
Voltage: 1,500 V


thanks