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TX850 issue


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I all! I'm from Italy!

I have bought on of your PSUs: the TX850W model replacing my old 600W in order to have a GTX460 SLI configuration.


The problem is that the system can't boot under default bios settings.

If I want my PC to boot I have to disable EIST, C1E, C3/C6/C7 and Turbo Boost.

Doing this I have cpu BLK set to 133MHz and Multiplier to 20x (So it works @ its nominal speed), RAM @ 1333Mhz and Voltage to default value.


If I enable the feature above to have power savings in idle it won't boot!


The dealer says that it is working and that's just a matter of arranging the configuration of the machine...

Give me some advice what should I do?


FYI: the rest of the configuration is as follows Mainboard: Gigabyte-P55A UD4; I5 750 Intel CPU, RAM 4GB Corsair XMS3 DDR3 1600 CL9, WD 500GB HD, DVD Writer Ssamsung


Thanks in advice!


This is a screenshot of the machine.




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  • Corsair Employee

What you describe is an issue with either the motherboard or the BIOS. I would first try updating the BIOS and see if there is any improvement. You may also want to test the PSU in a different system to see if the problems follow the PSU. If all else fails then we would be happy to replace the PSU for you, but your problems seem to be more related to the motherboard/BIOS.


If you would like to try an RMA, then please Request an RMA.

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Thanks for your reply.

Unfortunately, I have decided to write this post after all of those tests!

Bios updated, tested on another system with that already has a corsair hx850.

In that machine the only difference is that it show the dead blue screen and reboot!


Today I'll go to my seller and probably he will open an RMA.


Thanks a lot!

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No RMA, tested on mobo ASUS P6T with intel i7 and all power savings fetaure enabled and it works, I think I found an incompatibility with Gigabyte P55A-UD4 and P55A-UD5. I hope in a new BIOS release that fix this!


Thanks all!



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