Hi guys, I wonder if any of you can shed any light on an issue I have seen with the new llano A6 and A8motherboards. I have been using a Gigabyte SKT-FM1 A75M-UD2H motherboard and I started with a Corsair CX 430W PSU (rev2). But the board would not post, CPU fan 2sc only then stopped, then try power again and get no response at all. Re-seat the CPU or clear BIOS and then on the first attempt it will spin the fan again for a second or two, then nothing. I then went through the basic, board only no cables, swap RAM, change PSU for another Corsair CX 430, then even tried a swap from the A6 to the A8. I am a system builder, so had four more motherboards in stock so tried all of them, all show the same issue. Just in case I had killed the PSU CPU voltage with a faulty board or something I tried the next PSU to hand that was a cheap crap grey CIT 500W, that then worked fine? So tried the two Corsair PSU's on an Intel board and they work fine. So did some more testing and went through 8 PSU's. From the variety of cheap and branded units I have only two PSU's will get a Llano gigabyte board to post. These were the cheap crap CIT and an Antec True power 550W. I have re-traced my steps and all the motherboards, ram, CPU's work with those two PSU's. Any ideas? Do you have a working Gigabyte SKT-FM1 A75M-UD2H motherboard? If so what PSU are you using? Cheers guys.
Hi, this is an issue with corsair CX psu's at the moment. Basically the load is so low on start up that the psu believes nothing is connected and the psu shuts down. You can test this by putting in a dedicated graphics card and then the system will boot. Corsair are currently working on the issue and believe it to be a Llano issue and not a motherboard vendor specific problem.
encountered this issue a few times myself. Use of discrete card makes it work fine. OCZ StealthXtreme 2 600W - worked for a while then crapped out, use of discrete card would work, also using ODD it would boot in then power would cut when ODD went to idle after start up, tested no less than 4 motherboards all showed the same restart cycle with the OCZ. now using a Corsair CX430, just tried to run without discrete card, same issue, wont even boot. At first i thought I may have damaged a rail on the OCZ psu so that it wasnt delivering enough power to the CPU, but the single rail corsair has now cancelled that theory and it seems likely that there is some kinda power supply compatibility issue due to how power hungry the Llano chips are. under full CPU/GPU load the APU system draws around 160w, of course around 140w of that is directly going to the APU, without a graphics card, the i5 2500K only draws just over 100w. remember, most people choosing to use Llano will likely be running low end power supplies, and im getting the feeling that specific parameters are needed for the ~LLano setup. worst case scenario, go over kill with a high end PSU. issue still unresolved. EDIT<< word has it that they are still saying that the system draws 'too little' on post, which I'm not sure I believe that. It could be a PSU issue or a Llano issue but right now I feel for anyone encountering this problem. It took me forever to even find out what was even causing the problem.
Hi, Today i installed: Gigabyte A75M-UD2H AMD A8-3850 Artic Cooling Freezer 64 Pro Corsair CX430 Corsair Venegance LowProfile 2x2GB 1600Mhz SSD Samsung 830 64GB HDD Samsung Spinpoint F3 500GB I turned on the pc... All works perfectly... All fans turned on... Good... I turned off and went to dinner... After... I went to the BIOS, i setted RAM from 1333 to 1600 Mhz.. Restarted No CPU_FAN works.... I putted the cable of Artic Cooling in SYS_FAN... Nothing I putted the heat sink of boxed CPU in CPU_FAN and SYS_FAN.. it WORKS!!!! Tryed all settings.... nothing... Retryed one hour later... Setted SMART CPU FAN CONTROL to PWM and something Disabled and it worked!!!!!! I read in internet that Artic Cooling with SMART Control start to run the fan at 40C so i tryed resetting CPU control in Auto... At 60C the fan didn't started so i turned off. I retryed all ways to reset previous setting, nothing, i'm not able to start the fan anymore.... THIS IS SO STRANGE! I'm SURE 100% that is a problem of BIOS/CMOS... Why? Then.. the parameter (Case Open or something like this) that I setted to Disable... and than to Enable didin't come back to Enable!!!!! If i reset the CMOS or i retry.... nothing.... the CMOS is bugged, for me didn't recognize the changes of fans... Then tomorrow i'll do an update of BIOS... What do you say?
Hi everyone I have the same problem as rob - Gigabyte A75-UD2H motherboard + CX430 = no boot. I tried the system with a different PSU and it works absolutely fine. Did anyone ever find a solution to this? Full spec: A75-UD2H motherboard AMD A8-3780K 2x4GB DDR3 Crucial M4 128GB 2x 1TB Samsung F1 drives No graphics card or DVD drive Thanks ch424
Some people are reporting the same problem here: http://forum.corsair.com/forums/showthread.php?t=96784 I added another case fan, and now the system boots. WTF!?
