XFX Radeon HD 5770 850MHZ 1GB 4.8GHZ GDDR5 2XDVI HDMI Display Port DIRECTX11 PCI-E2.0 Video Card
Corsair TX750W 750W ATX 12V 60A 24PIN ATX Power Supply Active PFC 140MM Fan
The problem is, when I boot up, my computer shows me "12gb(8.0 gb usable)" in the memory section of computer properties. I even tried using just 2 sticks of RAM, but it would still show "8gb(40gb usable)" on most of the boots. It does boot up with the entire 12gb of memory at times but the system is very unstable. My games tend to hang up and I even got the blue screen of death, after around 2hours of gaming. I ran memtest with all three sticks in and no errors. I m running them individually right now, but so far no erors on the first two sticks. In resource monitor it shows the missing 4gb of memory as hardware reserved. I have attached a page of the memtest result of the second stick just before and after running memtest.
It does seem like people have had this problem earlier, but i couldn't figure out what they finally did to resolve the issue.
all my bios settings are at default, that is the stock settings i got my motherboard with (no overclocking of cpu/ram).
I tried reseating my ram many times, swapped slots with possibly all combinations. As for memory remapping, I couldn't find the option in my bios, and it's not mentioned in the manual either. Anybody familiar with this specific motherboard who can guide me?
Also why would it boot with all 12gb and then just 8gb randomly?
Anyways I updated to the latest bios from the gigabyte (http://www.gigabyte.com/products/product-page.aspx?pid=...) website. seems to have fixed the problem. but i got another headache to deal with now. Keep getting BSOD, and pc goes in a reboot loop with message "recovering lost dram size" until it finally hangs at the first motherboard boot screen.
What Voltage is the ram set to ? -- looks like you have DDR3-1333 CL 9-9-9-20 1.65V and are running them at DDR3 1079 8-8-8-19 and if you did not manually set the Voltage to 1.65 it may be trying to run at the 1.5V default voltage for DDR3 which may be too low for those modules to remain stable !! - check the voltage setting and adjust it to 1.65V and possibly adjust the timings to 9-9-9-20 also to see if they are then stable. Before trying to change the Timings\voltage to tighter timings and less voltage you need to test the modules to see if they can handle it and from what you have posted it seems these particular modules do not like the 8-8-8-19 timings at the voltage you have set right now ! ( a lower voltage might run fine with just a single module but may drop enough to be unstable with all 3 modules filled which could be why you are not having problems when testing individually )
Yeah I changed the voltage to 1.64V, and the timings to 9-9-9-20 earlier. THese screenshots were for the default settings. System still wasn't stable after increasing voltage and changing the timings. But it did work a lot better than the default settings.