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hi, i have 8gb of f3-16000cl9d-4gb installed in a ga-ma790fxt-ud5p with a phenom 955 BE cpu and my pc will not run stable with the full 8gb. (my cpu, its the 955 black edition, according to cpu-z its stepping 2, revision RB-C2, so that would be HDZ955FBK4DGI)
i have since read issues on the phenom ii cpus having trouble with more than 1 stick of ram on a single channel. i did not realise the issues with the amd chip's memory controller before i bought the ram and i was wondering if i could get some pointers on what settings may help me with a stable machine running the full 8gb.
the problem is blue screens, lots of them and totaly randomly. sometimes on boot, sometimes once i'm in windows. the blue screen errors are mostly different, but the most common ones are memory related. as soon as i'm only running 4gb, i have no problems. i have tested all 4 sticks of ram and there are no errors popping up on them.. i can run either pair entirely stable, but once both pairs are installed, the issues begin.
my full specs are:
gigabyte ga-ma790fxt-ud5p F8c bios
amd phenom 955 black edition with zalman cpns9700
8gb (4x2gb) g.skill trident 2000mhz (f3-16000cl9d-4gb)
e-power xscale 570w psu (ep-570mp)
512mb xfx 8800gt xxx with thermaltake duo orb
antec 900 case (lots of air flow)
windows 7 ultimate x64
i have tried changing the following:
ram at speeds of 800/1066/1333 (wont post at 1600)
setting ram timings manually even at stock speeds
cpu nb voltage
ddr3 voltage: 1.65 - 1.8v
cpu nb vid: +0.100 - +0.0375
cpu vid: 1.375 - 1.4v
ganged/unganged
interlaced enabled/disabled
different power supply
i was a bit wary about raising the voltages higher, but thats just random people's opinions scaring me out of risking my cpu.
i had tried setting the timings manually as rated on the packaging (9-9-9-27) but windows would not even boot.
i have tried different variations of everything i could think of with no luck. the only thing that has worked to achieve stability is to only run 4gb ram.
i have read of a few people saying 'sure i run 8gb ram, just up te cpu nb voltage' and others have said they have overclocked the nb to run stable with higher clocked ram, but they never give specifics. meanwhile i'm just pulling my hair out.
once again, i realise its a problem with the cpu memory controller, and probably not the motherboard or ram, but i think this is probably a good place to start.
i have run memtest on the system, once with each matched pair of ram installed individually and once with all four sticks of ram installed.
when each pair was run individually (i.e. 2 sticks installed) i had no errors on either pair. when all four sticks were installed however, i had lots of errors on test #5.
if anyone has any advice, i'd greatly appreciate it.
i have since read issues on the phenom ii cpus having trouble with more than 1 stick of ram on a single channel. i did not realise the issues with the amd chip's memory controller before i bought the ram and i was wondering if i could get some pointers on what settings may help me with a stable machine running the full 8gb.
the problem is blue screens, lots of them and totaly randomly. sometimes on boot, sometimes once i'm in windows. the blue screen errors are mostly different, but the most common ones are memory related. as soon as i'm only running 4gb, i have no problems. i have tested all 4 sticks of ram and there are no errors popping up on them.. i can run either pair entirely stable, but once both pairs are installed, the issues begin.
my full specs are:
gigabyte ga-ma790fxt-ud5p F8c bios
amd phenom 955 black edition with zalman cpns9700
8gb (4x2gb) g.skill trident 2000mhz (f3-16000cl9d-4gb)
e-power xscale 570w psu (ep-570mp)
512mb xfx 8800gt xxx with thermaltake duo orb
antec 900 case (lots of air flow)
windows 7 ultimate x64
i have tried changing the following:
ram at speeds of 800/1066/1333 (wont post at 1600)
setting ram timings manually even at stock speeds
cpu nb voltage
ddr3 voltage: 1.65 - 1.8v
cpu nb vid: +0.100 - +0.0375
cpu vid: 1.375 - 1.4v
ganged/unganged
interlaced enabled/disabled
different power supply
i was a bit wary about raising the voltages higher, but thats just random people's opinions scaring me out of risking my cpu.
i had tried setting the timings manually as rated on the packaging (9-9-9-27) but windows would not even boot.
i have tried different variations of everything i could think of with no luck. the only thing that has worked to achieve stability is to only run 4gb ram.
i have read of a few people saying 'sure i run 8gb ram, just up te cpu nb voltage' and others have said they have overclocked the nb to run stable with higher clocked ram, but they never give specifics. meanwhile i'm just pulling my hair out.
once again, i realise its a problem with the cpu memory controller, and probably not the motherboard or ram, but i think this is probably a good place to start.
i have run memtest on the system, once with each matched pair of ram installed individually and once with all four sticks of ram installed.
when each pair was run individually (i.e. 2 sticks installed) i had no errors on either pair. when all four sticks were installed however, i had lots of errors on test #5.
if anyone has any advice, i'd greatly appreciate it.
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