Originally Posted by Sin0822
have u tried different memory? at least that way u can make sure it isn't something else. if it is the memory then at least i can report that
That's very nice of you (you would be more helpful than Gigabyte has been until now). I don't have another kit to test right now. I'll try to see if I can get some from work.
Maybe you can relay all of the following to Gigabyte:
Could it be that this mobo is more sensitive about the 12V rail?
I have a Corsair CX 400W PSU which actually gives 12.40 to 12.52 V (measured) on the 12V rail. It's supposed to source 30A on the 12V rail. On the 12V rail, beside the mobo itself I have the following:
- 1 x Laing D5 water pump which sinks quite some hefty current on the 12V rail: measured 0.7A on the lowest setting and 1.7A on the highest setting
- 2 x 3.5" hard drives (Samsung F2 1GB, 2 x platter each)
- 1 x 2.5" hard drive (Samsung M8 1 platter)
- 1 x SSD (Samsung 830 256 GB)
- 4 x Corsair AF140 fans, 0.15A each -- they all run from the same fan header which is supposed to source about 1A; I haven't seen any specs for the min source current for the fan headers on this mobo. This might be the culprit. I had 5 fans connected to it once and the max instantaneous current I measured was 0.74A when they started, after which it goes to about 0.34A -- the fans worked fine and the system continued to work; I'm pretty sure the mobo is not fried as I'm writing this post using it and fans connected to that header still work and are controlled using Q-Fan fine. I'm not sure it weakened any component on the mobo though.
Symptoms I've never seen discussed anywhere on the web during my searches:
- Sometimes when powering on, it doesn't post, the fans blow at full speed, one or two hard drives are clicking continuously like click,click,click,.... every 0.5 seconds, the LED display is blinking with the same frequency as the hdd clicking sound and is showing gibberish, the mobo bios LEDs blink alternatively (main then backup then main ...) again with the same frequency as the hdd clicking sound
- Now hear this one:
- If after the above step with clicking sounds and blinking leds I power off (power cable discunnected) and disconnect all hard drives, leaving just the ssd and try to power on, I can see the bios led and the led display come on for a split second and then dies.
- Pressing the power on button again does nothing. Disconnecting and reconnecting the AC power cord, the LEDs again come on for a split second and then dies.
- Trying to clear the bios either from the push button on the mobo (top-right corner) or the jumper (bottom), has no effect
- Connecting all hard drives again and it powers on fully!!
- After it powers on fully, it may go back into step 1. or into boot loop or if I'm lucky, boot normally.
- When it boot loops, it powers off by itself a few times, restarts itself a few times, and also sometimes looks like it tries to go into the BIOS (also by itself) as I see the blue top background and it saying "UEFI BIOS" and then powers off, and then back on, etc -- all of these in one loop. Sometimes the loop ends in step 1. Other times, I'm lucky and it boots normally.
What I'm trying now:
- I removed the pump. I'm watching core temps and not running anything intensive. Max temps are still around 45C. That's actually pretty impressive considering the water is static (granted, I have the Full Nickel version of the EK Supremacy waterblock)
- I removed those 4 fans from the fan header
- I removed the two 3.5" hdds
Since I did that, I've been able to reboot and send it to sleep without problems for about 10 times. I'm still testing but it looks promising. Fingers crossed !!
Edit: nope, it's still there.
Very odd behavior: If i disconnect all fans, water pump and all hard drives (leaving only the mobo and ssd) then it alost never powers on. I can see the led comin on for a split second and then goes off and never powers on. I have to unplug from the outlet and reset CMOS and then I have to connect at least one hard drive. It could be that my old Corsair CX 400W psu decreases voltage levels too much at light loads and th emobo doesn't like it at all.
The ram is also definitely affecting it. I have much less boot loop and power on issues when XMP is disabled (1333 MHz). When it's enabled (2400MHz) then the issues are back almost constantly. It's either the PSU or this mobo doesn't really work with 2400 ram.
It seems gigabyte hasn't tested this ram kit extensively and they either rushed to mention it as supported memory or were just lucky in their tests ...
I'll try a more capable PSU that has better stability on the 12V rail and also a measured voltage level closer to 12.00 V (even though the ATX spec say +/- 5%, which means max 12.6V).
Has anyone experienced PSU issues like the above before?
I'll post back after more testing.
p.s. The same hardware and PSU were used with an Asus Maximus V Gene and Asus P8Z77-V Pro without any issues. On a Gigabyte UD3H it also worked fine, but resuming from sleep sometimes also didn't work (no boot loops, it was only resetting once).
Edited by mastabog - 9/17/12 at 11:39pm