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Few weeks ago, ran memtest86+ 4.0 overnight with a new system - no errors detected. Installed Win 7 64bit, which ran smoothly. About a week later, I started getting random BSOD. Ran memtest86+ and it detected lots of errors which I thought was very odd since it ran fine over many cycles a week ago. Checked the g.skill forums and found settings for i7-860. cleared the BIOS (running F5) by shorting the cmos pin, loaded optimized defaults...and then tweaked the rest of the settings. executed memtest86+ which ran overnight - no errors. Reinstalled win 7 and everything was good. 4 or 5 days later, started getting random BSOD again. Suspected memory again and re-ran memtest86+ and again got a couple of errors consistently. 
Dont understand what could be wrong. Why memtest86+ would be ok for overnight tests only to not work a few days later consistently.
Here is what I have
CPU: i7-860 (stock)
Motherboard: Gigabyte P55-UD4P running F5 bios
Memory: G.skill F3-12800CL7D-4GBRH. I would like it to run DDR3-1600 at 7-7-7-24
OS: Windows 7 64bit
When I do run memtest86+ v4.00, an odd thing I notice is that the memory SPD informations is slightly wrong
- Slot 0: 2048 MB PC3-10600 - G Skill Intl F3-12800CL -2GBRH *XMP*
- Slot 1: 2048 MB PC3-10600 - G Skill Intl F3-12800CL -2GBRH *XMP*
**** It displays that its PC3-10600. Shouldn't it display PC3-12800?
Also in this latest runs, consistently, Test 4 fails in memtest86+
Tst Pass Failing Address Good Bad Err-Bits
--- ---- ---------------------- -------- -------- --------
4 0 000dd573c50 - 3541.4MB 6b57922f 6b57922d 00000002
These are the settings I'm using:
<--- blue means the line display is blue which is a non-configurable setting in that line
Advanced Frequency Settings:
CPU Clock Ratio 21x
CPU Frequency 2.8GHz (133x21) <--- blue
Advanced CPU Core Features [Press Enter]:
Intel(R) Turbo Boost Tech................[Disabled]
CPU Cores Enabled........................[All]
CPU Multi-Threading......................[Enabled]
CPU Enhanced Halt (C1E)..................[Auto]
C3/C6/C7 State Support...................[Auto]
CPU Thermal Monitor......................[Auto]
CPU EIST Function........................[Disabled]
Bi-Directional PROCHOT...................[Auto]
QPI Clock Ratio..........................[Auto]
QPI Link Speed...........................[4.8Ghz] <--- blue
Uncore Clock Ratio.......................[18x] <--- blue
Uncore Frequency.........................2400MHz <--- blue
>>>>> Standard Clock Control <<<<<
Base Clock (BCLK) Control................[Enabled]
BCLK Frequency ..........................[133]
Extreme Memory Profile (X.M.P.)..........[Disabled]
System Memory Multiplier (SPD)...........[12.0]
Memory Frequency (MHz)...........1333.....1600 <--- blue
PCI Express Frequency (MHz)..............[100]
C.I.A.2..................................[Disabled]
>>>>> Advanced Clock Control <<<<<
CPU Clock Drive..........................[ 800mV]
PCI Express Clock Drive..................[ 900mV]
CPU Clock Skew...........................[ 0ps]
Advanced Memory Settings:
Extreme Memory Profile (X.M.P.)..........[Disabled]
System Memory Multiplier (SPD)...........[12.0]
Memory Frequency (MHz)............1333....1600 <--- blue
Performance Enhance (SPD)................[Standard]
DRAM Timing Selectable (SPD).............[Expert]
Profile DDR Voltage ......................1.5v <--- blue
Profile QPI Voltage ......................1.1v <--- blue
Channel Interleaving.................6...[Auto]
Rank Interleaving....................4...[Auto]
>>>>> Channel A & B
Channel A Timing Settings [Press Enter]:
Cas Latency Time..................9......[7]
tRCD..............................9......[7]
tRP...............................9......[7]
tRAS.............................24......[24]
>>>>> Advanced Timing Control
tRC..............................33......[Auto]
tRRD..............................4......[Auto]
tWTR..............................5......[Auto]
tWR..............................10......[Auto]
tWTP.............................21......[Auto]
tWL...............................7......[Auto]
tRFC.............................74......[Auto]
tRTP..............................5......[Auto]
tFAW.............................20......[Auto]
Command Rate (CMD)................1......[2]
>>>>> Misc Timing Control
B2B Cas Delay.....................-......[Auto]
Round Trip Latency...............47......[Auto]
Channel A & B Turnaround Settings [Press Enter]:
Different DIMMs...................6......[Auto]
Different DIMMs...................5......[Auto]
On The Same Rank..................1......[Auto]
>>>>> Channel A & B Writes Followed By Writes
Different DIMMs...................6......[Auto]
Different DIMMs...................6......[Auto]
On The Same Rank..................1......[Auto]
Advanced Voltage Settings:
******Mother Board Voltage Control ******
Voltage Types............Normal......Current
--------------------------------------------
>>> CPU
Load Line Calibration...................[Disabled]
CPU Vcore....................1.075v.....[Auto]
QPI/VTT Voltage..............1.100v.....[Auto]
>>> MCH/ICH
PCH Core.....................1.050v.....[Auto]
CPU PLL......................1.800v.....[Auto]
>>> DRAM
DRAM Voltage.................1.500v.....[1.640v]
DRAM Termination.............0.750v.....[Auto]
Ch-A Data VRef...............0.750v.....[Auto]
Ch-A Data VRef...............0.750v.....[Auto]
Ch-B Data VRef...............0.750v.....[Auto]
Ch-B Data VRef...............0.750v.....[Auto]
Miscellaneous Settings:
Isochronous Support.....................[Enabled]
Virtualisation technology...............[Disabled]
I've seen a similar problem posting by d0rift for a slightly different motherboard
http://www.gskill.us/forum/showthread.php?t=3087
Dont understand what could be wrong. Why memtest86+ would be ok for overnight tests only to not work a few days later consistently.
Here is what I have
CPU: i7-860 (stock)
Motherboard: Gigabyte P55-UD4P running F5 bios
Memory: G.skill F3-12800CL7D-4GBRH. I would like it to run DDR3-1600 at 7-7-7-24
OS: Windows 7 64bit
When I do run memtest86+ v4.00, an odd thing I notice is that the memory SPD informations is slightly wrong
- Slot 0: 2048 MB PC3-10600 - G Skill Intl F3-12800CL -2GBRH *XMP*
- Slot 1: 2048 MB PC3-10600 - G Skill Intl F3-12800CL -2GBRH *XMP*
**** It displays that its PC3-10600. Shouldn't it display PC3-12800?
Also in this latest runs, consistently, Test 4 fails in memtest86+
Tst Pass Failing Address Good Bad Err-Bits
--- ---- ---------------------- -------- -------- --------
4 0 000dd573c50 - 3541.4MB 6b57922f 6b57922d 00000002
These are the settings I'm using:
<--- blue means the line display is blue which is a non-configurable setting in that line
Advanced Frequency Settings:
CPU Clock Ratio 21x
CPU Frequency 2.8GHz (133x21) <--- blue
Advanced CPU Core Features [Press Enter]:
Intel(R) Turbo Boost Tech................[Disabled]
CPU Cores Enabled........................[All]
CPU Multi-Threading......................[Enabled]
CPU Enhanced Halt (C1E)..................[Auto]
C3/C6/C7 State Support...................[Auto]
CPU Thermal Monitor......................[Auto]
CPU EIST Function........................[Disabled]
Bi-Directional PROCHOT...................[Auto]
QPI Clock Ratio..........................[Auto]
QPI Link Speed...........................[4.8Ghz] <--- blue
Uncore Clock Ratio.......................[18x] <--- blue
Uncore Frequency.........................2400MHz <--- blue
>>>>> Standard Clock Control <<<<<
Base Clock (BCLK) Control................[Enabled]
BCLK Frequency ..........................[133]
Extreme Memory Profile (X.M.P.)..........[Disabled]
System Memory Multiplier (SPD)...........[12.0]
Memory Frequency (MHz)...........1333.....1600 <--- blue
PCI Express Frequency (MHz)..............[100]
C.I.A.2..................................[Disabled]
>>>>> Advanced Clock Control <<<<<
CPU Clock Drive..........................[ 800mV]
PCI Express Clock Drive..................[ 900mV]
CPU Clock Skew...........................[ 0ps]
Advanced Memory Settings:
Extreme Memory Profile (X.M.P.)..........[Disabled]
System Memory Multiplier (SPD)...........[12.0]
Memory Frequency (MHz)............1333....1600 <--- blue
Performance Enhance (SPD)................[Standard]
DRAM Timing Selectable (SPD).............[Expert]
Profile DDR Voltage ......................1.5v <--- blue
Profile QPI Voltage ......................1.1v <--- blue
Channel Interleaving.................6...[Auto]
Rank Interleaving....................4...[Auto]
>>>>> Channel A & B
Channel A Timing Settings [Press Enter]:
Cas Latency Time..................9......[7]
tRCD..............................9......[7]
tRP...............................9......[7]
tRAS.............................24......[24]
>>>>> Advanced Timing Control
tRC..............................33......[Auto]
tRRD..............................4......[Auto]
tWTR..............................5......[Auto]
tWR..............................10......[Auto]
tWTP.............................21......[Auto]
tWL...............................7......[Auto]
tRFC.............................74......[Auto]
tRTP..............................5......[Auto]
tFAW.............................20......[Auto]
Command Rate (CMD)................1......[2]
>>>>> Misc Timing Control
B2B Cas Delay.....................-......[Auto]
Round Trip Latency...............47......[Auto]
Channel A & B Turnaround Settings [Press Enter]:
Different DIMMs...................6......[Auto]
Different DIMMs...................5......[Auto]
On The Same Rank..................1......[Auto]
>>>>> Channel A & B Writes Followed By Writes
Different DIMMs...................6......[Auto]
Different DIMMs...................6......[Auto]
On The Same Rank..................1......[Auto]
Advanced Voltage Settings:
******Mother Board Voltage Control ******
Voltage Types............Normal......Current
--------------------------------------------
>>> CPU
Load Line Calibration...................[Disabled]
CPU Vcore....................1.075v.....[Auto]
QPI/VTT Voltage..............1.100v.....[Auto]
>>> MCH/ICH
PCH Core.....................1.050v.....[Auto]
CPU PLL......................1.800v.....[Auto]
>>> DRAM
DRAM Voltage.................1.500v.....[1.640v]
DRAM Termination.............0.750v.....[Auto]
Ch-A Data VRef...............0.750v.....[Auto]
Ch-A Data VRef...............0.750v.....[Auto]
Ch-B Data VRef...............0.750v.....[Auto]
Ch-B Data VRef...............0.750v.....[Auto]
Miscellaneous Settings:
Isochronous Support.....................[Enabled]
Virtualisation technology...............[Disabled]
I've seen a similar problem posting by d0rift for a slightly different motherboard
http://www.gskill.us/forum/showthread.php?t=3087
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