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Unstable P7P55D-E-LX + i5 760

Last response: in Systems
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September 25, 2010 10:08:32 PM

Hi all,

I am having trouble getting my new build to be stable. It freezes randomly, and also blue screens.

Parts:
Asus P7P55D-E LX
i5 760
Gskill F3-12800CL7D 4Gb
Win 7 64 bit
GTX 470 video card

I think it may have something to do with the memory settings. Below is what CPU ID comes up with. The GSkill website shows that I should use CL 7-8-7-24-2N 1.6 Volts. The default values that the ASUS motherboard set-up are CL 9-9-9-24 1.50 volts. I have tried both and the result is the same, random lock-ups and very unstable. Altough it does boot to Windows with just enough time to run CPU-ID.

Thanks in advance for any help.

Chipset
-------------------------------------------------------------------------

Northbridge Intel DMI Host Bridge rev. 11
Southbridge Intel P55 rev. 06
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR3
Memory Size 4096 MBytes
Channels Dual
Memory Frequency 668.8 MHz (2:10)
CAS# latency (CL) 9.0
RAS# to CAS# delay (tRCD) 9
RAS# Precharge (tRP) 9
Cycle Time (tRAS) 24
Row Refresh Cycle Time (tRFC)74
Command Rate (CR) 1T
Uncore Frequency 2140.1 MHz

Memory SPD
-------------------------------------------------------------------------

DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD000000)
Size 2048 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number F3-12800CL7-2GBRM
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.1
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-17-23 @ 457 MHz
JEDEC #2 7.0-7-7-20-27 @ 533 MHz
JEDEC #3 8.0-8-8-22-31 @ 609 MHz
JEDEC #4 9.0-9-9-25-34 @ 685 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.600 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 8.75 ns
Min tRCD 10.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 49.00 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 7.0-8-7-24-40-2T @ 800 MHz (1.600 Volts)

DIMM # 2
SMBus address 0x52
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD000000)
Size 2048 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number F3-12800CL7-2GBRM
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.1
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-17-23 @ 457 MHz
JEDEC #2 7.0-7-7-20-27 @ 533 MHz
JEDEC #3 8.0-8-8-22-31 @ 609 MHz
JEDEC #4 9.0-9-9-25-34 @ 685 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.600 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 8.75 ns
Min tRCD 10.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 49.00 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 7.0-8-7-24-40-2T @ 800 MHz (1.600 Volts)

More about : unstable p7p55d 760

September 26, 2010 1:03:11 AM

You can try each stick of ram individualy to see if one of the sticks is causing the problem, or download and run memtest86 to ceck for ram errors. I run memtest atleast 1hour per gig (personal preference).
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September 26, 2010 8:15:46 PM

First, make sure the RAM is fully seated. Do you have the RAM in the DIMM 1 and DIMM 3 slots - which are actually the 2nd and 4th slot from the CPU?

Does Asus BIOS have a load optimized settings option? If so, try that. If that doesn't work, leaving the RAM at the 9-9-9-24 settings, bump the DRAM/DIMM V to 1.6V and try again.


Also as mentioned run memtest86+. Better to let it run overnight. If you find errors you can then run against one stick at a time.

Another option is to take out 1 stick, see if the system is stable. Then swap sticks and test for stability with just the second stick.
m
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!