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Did my new PSU mess up my MB or processor? and WARNING - Do not buy Corsair Hx750i PSU!

678 views 20 replies 5 participants last post by  SavantStrike 
#1 ·
Hi Guys
i got a used PC (i7 - 3820 with a Gigabyte x79-UD3 Mainboard - all was perfectly fine
in some other discussions within the Forum someone recommended me to change my PSU to get better Overclocking results and because the old PSU was "crap".
Well - done - i work in a IT company and i got a Corsair Hx750i (160 euro Platinum PSU - i thought it must be a good one) for a very good price (80 euros only) because they got some Partnership (it was not among the once i got recommended within the Forum - they recommended much cheaper once - but after reading some very good reviews i decided to give it a try...

What happened - first PSU was a Dead on arrival - well that can happen
they sent me a new one - this one worked very fine for like 5-6 days - but from this moment on i had a problem with running on my Stable (and very moderate) overclock- really moderate one that was already easily handled from my old Be Quiet PSU

after 5-6 days - i tried again to make a overclock (back to this moderate one) - but MB simply refused and asked me to revert to standard settings - 2 days later - the PSU was no longer able to Power up half of the stuff like my Mouse Dongle for the Wireless mouse - a USB hub - my Keyboard.... and also suddenly Boot time (SSD!) went up to 2+ minutes!

I unplugged this PSU - plugged in the old PSU and all worked fine again:
EXEPT:
1. the boot time still remains at 2 min. - AFTER BOOT ALL Read and Write times are totally fine!!!! but firing the system up causes a long delay
2. Also my stable standard overclock was fine for just 1 run with the old PSU - then suddenly shut down the PC and it does not accept any more this overclock - also asked my to revert BIOS back to "standard settings"

all the other problems are gone - so the Corsair PSU is definitely the source of problems!

well now my Question - do you think that it messed up my Processor or my MB? or both?

how can i find out what the problem is and try to eliminate it? is there a way?
Would really appreciate help from you guys....

the only thing i did not try so far is - to plug SSD into a different PC and see how long it will take... but will try that ASAP to see if the PSU maybe damaged something on hy SSD or if the fault comes from the MB or Processor....
cheers
Ugur
 
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#2 ·
You might want to edit out all the cursing before a mod deletes your thread
 
#4 ·
Some guesses:

I would completely reset your BIOS as a starting point. (Looks like you will need to use the CLR_CMOS jumper)

I doubt anything is damaged but you did mentioned that your usb devices failed to work with the corsair psu, if your disk bootup sequence isnt hardcoded maybe it's searching for a bootable usb device and encountering a ton of errors. I would disable boot from usb or cdrom and force it to look at the sata devices first.

Also you mention your BIOS got revert to Standard Settings (with are usually conservative), possibly some safe setting is causing the delay. There are a ton of settings which may slow your bootup - testing ram, checking for network boot, searching for drives every bootup vs you define which drives it checks, sata settings (raid, ahci, ide mode), ect.

Also check the SATA cables and power connections to your drives - maybe theres a bad connection there, maybe a cable got damaged or badly crimped while swapping psu's.
 
#5 ·
Quote:
Originally Posted by ug1977 View Post

but the title can't be changed?
UG
Yes it can on the top left of the page where it says edit thread
As for the PSU bad one off´s and accidents can happen to anyone so thats not the fault of the brand series or model
 
#6 ·
Quote:
Originally Posted by BinaryDemon View Post

Some guesses:

I would completely reset your BIOS as a starting point. (Looks like you will need to use the CLR_CMOS jumper)

I doubt anything is damaged but you did mentioned that your usb devices failed to work with the corsair psu, if your disk bootup sequence isnt hardcoded maybe it's searching for a bootable usb device and encountering a ton of errors. I would disable boot from usb or cdrom and force it to look at the sata devices first.

Also you mention your BIOS got revert to Standard Settings (with are usually conservative), possibly some safe setting is causing the delay. There are a ton of settings which may slow your bootup - testing ram, checking for network boot, searching for drives every bootup vs you define which drives it checks, sata settings (raid, ahci, ide mode), ect.

Also check the SATA cables and power connections to your drives - maybe theres a bad connection there, maybe a cable got damaged or badly crimped while swapping psu's.
That was best post - and very helpfull! - left a REP+
did at first the CLR_Cmos reset (removing battery allone was not enough as it seam - the delay on boot was gone!)
but still instability on overclock
then removed all RAM - tested 1 stick after other - 1 stick was faulty ( i think the Corsair PSU did this - as all before was working totaly fine) - but i found within just 1 hour totaly the same stick (someone was selling on a lokal sales platform for used stuff - (pure luck to find exactly the same stick modell - gave him 40 Euros for 2 sticks each 8GB :) now i have a 1 stick as a additional replacement in case one more breaks :) got again my 32 GB now running in Quad channel)

and WOW - all works again like a charm....
Many thanks!
 
#7 ·
So the power supply is actually good? Did you pull any muscles jumping to your conclusions? Glad you were able to diagnose the problem. Computer issues are always frustrating.
 
#9 ·
You should have asked for an RMi or an RMx instead as they are an improved version of the HXi
In fact its completely pointless to buy a HXi to begin with as besides that the RMi and RMx are better they are also cheaper
 
#10 ·
Shilka i took what they offered. They sent a list and the Sales guy said he got the HXi and it is great. Well i should have asked here in the forum first before deciding. Well i will sell this RMA replacment that i will get and go for Seasonic or EVGA. Have it on a lokal Site for privat Sales (Same where i found the RAM) and have already 4 emails asking for it (sell at 120 Euro) that should get me a seasoninc prime gold 550 or 650 think. What you think about this PSU?
 
#11 ·
#13 ·
The info is in the link in my last post
 
#14 ·
Hi
as you are an expert - Corsair Hx750i PSU - i got now the replacment
you think i should give it one more chance or change it to something different?
just get your thoughts about it...
well my trust is quite damaged into that product - but don't know if i should give it a 3rd chance...
 
#15 ·
Quote:
Originally Posted by shilka View Post

The info is in the link in my last post
Hi
as you are an expert - Corsair Hx750i PSU - i got now the replacment
you think i should give it one more chance or change it to something different?
just get your thoughts about it...
well my trust is quite damaged into that product - but don't know if i should give it a 3rd chance...
 
#16 ·
If you had problems with it and you dont trust it you should not use it when you are not comfortable with it
Sell it or keep it as a backup PSU

Buy a Seasonic Foucs Plus or a Prime Ultra instead
 
#17 ·
Quote:
Originally Posted by shilka View Post

You should have asked for an RMi or an RMx instead as they are an improved version of the HXi
In fact its completely pointless to buy a HXi to begin with as besides that the RMi and RMx are better they are also cheaper
Isn't the hx750i just the platinum version of the rm750i. I think they are both the same basic CWT design. It's not the old HX series unit IIRC.

I've used a fair number of the CWT based corsair units RMX,RMI, newer HXI) and they have all fine quite well.

Is it possible there's a site wiring fault? Is the be quiet modular, and if so the be quiet cables were discarded when the corsair was installed?

Two units failing is extremely unusual.
 
#18 ·
Quote:
Originally Posted by SavantStrike View Post

Isn't the hx750i just the platinum version of the rm750i. I think they are both the same basic CWT design. It's not the old HX series unit IIRC.

I've used a fair number of the CWT based corsair units RMX,RMI, newer HXI) and they have all fine quite well.

Is it possible there's a site wiring fault? Is the be quiet modular, and if so the be quiet cables were discarded when the corsair was installed?

Two units failing is extremely unusual.
The HXi uses the older type 3 cables where the RMi uses the newer type 4 cables
The RMi is an improved version of the HXi not the other way around
 
#19 ·
Quote:
Originally Posted by SavantStrike View Post

Isn't the hx750i just the platinum version of the rm750i. I think they are both the same basic CWT design. It's not the old HX series unit IIRC.

I've used a fair number of the CWT based corsair units RMX,RMI, newer HXI) and they have all fine quite well.

Is it possible there's a site wiring fault? Is the be quiet modular, and if so the be quiet cables were discarded when the corsair was installed?

Two units failing is extremely unusual.
The Be Quiet is Not modular. All was running Fine with 2 nd one for like 5-6 days. Then it freaked out. Not really sure what to do... 2 times a fail is really making me think if i should try also the 3rd one or just sell away... i'm pretty sure if i use it it will work. But how long?!?
 
#20 ·
If you feel like you cant trust it then dont use it
Keep it as a backup or sell it

I would never use anything that failed me twice
 
#21 ·
Quote:
Originally Posted by shilka View Post

If you feel like you cant trust it then dont use it
Keep it as a backup or sell it

I would never use anything that failed me twice
I wouldn't either, but my gut says there's more to this. Two fairly well made PSUs shouldn't fail in a row.

I would check my line in voltage to make sure I'm not getting brown outs or switching spikes.
 
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