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Discussion Starter · #1 ·
just about an hour ago i had windows and post detect 12gigs of ram;

setup
slot 1, slot 2, slot 3, slot 4
2g 4g 2g 4g

i was running prime for oc stability and i get a black screen. turn it off and that is when i notice post not showing all my ram
i turn off everything then try some troubleshooting

slot 1, slot 2, slot 3, slot 4
2g x x x

post detect 2g

slot 1, slot 2, slot 3, slot 4
2g 2g x x

post detect 4g

slot 1, slot 2, slot 3, slot 4
2g 2g 4g x

post detect 8g

i mem test the 2g sticks as they are old (2yr) the 4g's i havnt since i just got them.

so 1 stick is bad or one ram slot is bad? idk how/why cpu-z shows different than windows
 

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I THINK CPU-z shows based on the data it gets from the RAM chips, but the BIOS and Windows display the usable ram. So CPU-z might be able to get JEDEC info from bad sticks or slots. Have you tried every stick on it's own and every slot on it's own?
 

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Ahhhhhh. I see you're on an X6 Phenom. Are you overclocked at all? First, that 1.5v could be a problem. Back when I had an X6, if the CPU was unstable or the memory controller was at it's limits I saw exactly what you are describing. To start with, bump the RAM voltage up to 1.5v and, if you have an overclock, reduce it to stock.
 

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Discussion Starter · #6 ·
Yeah I had my Feb at 285 oc CPU 3.7x but left ht and nb at 2k. Had ram at either 4 or 5.33 mult. My ram is rated 1.5v. Sometimes I would do do +.05v for the ram.

Let me explain again as maybe I wasn't clear if I set to 1.52v BIOS will say its 1.47v I can't remember if this did this when showing all12 or only 8.
 

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http://support.amd.com/us/kbarticles/Pages/ddr3memoryfrequencyguide.aspx#controller

Since you have 4 slots filled, you 'technically' have a default speed of 1066, so you are straining your memory controller.

Try this.... leave everything the same, but dial your bus speed back a bit. say...270 instead of 285. If it then boots normally then the ram itself is fine. If that works then go back to 285, but increase your CPU-NB volts...I'd start with a .05 or even a .1v jump.

See what that does for you
 

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Discussion Starter · #8 ·
So clearing the cmos will not help? I was reading that resetting the ibd or its a 3 letter thing that is tied to the ram could help. Tried 270fsb ram is actually a little higher 1080. Only detects 8gigs and windows feels slow/sluggish. Windows now saying 13g of ram installed and 8 gigs usable. My nb is 1.2
 

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If you have Windows 7 Home Premium 64bit installed, it will only see 8GB.
 

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Reinstall?
 

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I agree. The last thing to try, before blaming the memory controller on the CPU at least, is a re-install of windows. Maybe even try a Linux live DVD if you're up to it, to see what it detects.
 

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Discussion Starter · #15 ·
I'll do that in a few hours

Was looking for ways to repair windows. Bit hesitant as the last few times I have done it, xp, me, 7 it ended up a doing nothing or b deleationg many of my files. Has anyone done "
windows vista/7? Make a small partition on your storage hd and mark it active in disk management. Now fish ur cd out and copy sources, boot, and bootmgr to it. Now you always have windows installer 1 reboot away, and it's waaaaaay faster than installing from a cd." And have it work. I do plan on installing later today and see the resulrs

http://forum.giga-byte.co.uk/index.php/topic,2515.0.html
 
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