Asrock P55 Extreme + F3-14900CL9D-8GBSR (4x2) POST and OS see only 4088MB

[zinuzoid]

problem is on POST and in OS it show only 4088MB (suppose to be 8gb)

but in BIOS Setup it recognize 2 dimm, total memory 8192MB

My setting rightnow

Asrock P55 Extreme(lastest bios 2.70) + i5 760 + F3-14900CL9D-8GBSR (4x2)
I put ram in A1,B1

DRAM
tCL 9[Auto]
tRCD 10[Auto]
tRP 9[Auto]
tRAS 28[Auto]
tRFC 150[Auto]
tWR 14[Auto]
tWTR 7[Auto]
tRRD 5[Auto]
tRTP 7[Auto]
tFAW 24[Auto]
CHA RTL 0[Auto]
CHB RTL 51[Auto]
tWL 7[Auto]
RttNom 60[Auto]
RttWr Disable[Auto]
PD Exit Mode Slow[Auto]
B2B CAS Delay Disable[Auto]
Command rate 2[2]
Enhanced Training [Auto]

BCLK 187
PCIE 100
CPU Ratio 15[15]
QPI Frequency 6.732GT[Auto]
DRAM Frequency 933MHz 1866

AsRock VDrop Control [Without VDrop]
CPU Voltage [1.3v]
DRAM Voltage 1.587v[1.587v]
DRAM CTRL REF Voltage 0.0v[Auto]
DRAM DATA REF Voltage 0.0v[Auto]
VTT Voltage 1.309V[1.309v]
PCH Voltage 1.079[Auto]
CPU PLL Voltage 1.870v[1.870v]


any suggestion?
Thanks

[GSKILL TECH]

Lower VTT Voltage, it is quite high.

Manually input DRAM timings.

Have you tried reseating the RAM?

Thank you
GSKILL TECH

[zinuzoid]

I reduce VTT to 1.219v (is it ok?)

I try to swap the ram
and try manually 9-10-9-28-2T config but no luck

still shown 4088MB in post

[Tradesman]

What version of Win?

[zinuzoid]

I try to test with Windows7, Ubuntu, Centos, MemTest86+ already. everything said 4088mb. and yes it's 64 bit.

[GSKILL TECH]

Feel free to send in for RMA exchange to see if a new kit works better.

Thank you
GSKILL TECH