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Random and frequent bsod in dual channel mode

Last response: in CPUs
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July 19, 2011 12:14:40 PM

Specs
phenom II x4 955 c3
gigabyte 880gm-usb3
corsair cmx4gx3m2a1600c9 2x2 gb
seasonic s12 II 430w bronze
windows 7 ultimate x64

guys heres my problem

whenever i run the ram in dual channel mode there are random and frequent BSOD (even prime95 causes a bsod)
whereas everything was fine a few days back.
currently running in single channel and everything is fine.

have tested the ram using memtest 86+ 4.20 (ram shows no errors after 13 passes) tried each stick individually.
Another thing i noticed was ram runs at only 200/400 mhz as shown by memtest, only in slots 2 and 4
whereas in 1 and 3 it runs at 667/1333

BIOS is set to default including ram voltage and timings.

now is it a motherboard or CPU issue.
a c 159 à CPUs
July 19, 2011 4:47:30 PM

The cpu has nothing to do with the ram speed, unless you're overclocking. Then the board will choose the most convenient setting for the ram according to the built in ram dividers or "ratios" in the motherboard bios. Sometimes, these aren't listed, but you may find them in one of the manual settings. I suggest you check for a bios update; your ram may be fine; could be a change in one of the bios settings. I've had sudden changes during a boot up for no apparant reason.
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July 19, 2011 5:23:20 PM

razer_76 said:
Specs
phenom II x4 955 c3
gigabyte 880gm-usb3
corsair cmx4gx3m2a1600c9 2x2 gb
seasonic s12 II 430w bronze
windows 7 ultimate x64

guys heres my problem

whenever i run the ram in dual channel mode there are random and frequent BSOD (even prime95 causes a bsod)
whereas everything was fine a few days back.
currently running in single channel and everything is fine.

have tested the ram using memtest 86+ 4.20 (ram shows no errors after 13 passes) tried each stick individually.
Another thing i noticed was ram runs at only 200/400 mhz as shown by memtest, only in slots 2 and 4
whereas in 1 and 3 it runs at 667/1333

BIOS is set to default including ram voltage and timings.

now is it a motherboard or CPU issue.



I actually had the exact same problem when running my OCZ Reaper Series DDR2 800Mhz DIMMs in Dual-Channel. First I flashed my Motherboard BIOS to the latest version and then I noticed the default values were placing the RAM at 5-5-5-15 1.8v. When I looked at the sticker on the RAM it showed it rated at 4-4-4-15 2.1v. I went into the BIOS and manually plugged in the settings for 4-4-4-15 2.1v and it fixed the issue.

I'd check the BIOS settings to see if it's detecting the values correctly at Default, if not manually adjust them to see if this works like it did for me.
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July 20, 2011 6:16:52 PM

ok guys solved the problem after following advice from gigabyte forum

solution:
clear cmos settings
remove cmos battery
replace cmos battery after 1 hour
start pc and load optimized system defaults in BIOS.
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