Not enough PSU Power?

[radekmm]

Hi Tomshardware Team
I've recently bought an XFX Radeon HD 7970 used for 125€ and I am loving it so far. it ran great with my 350w PSU (BeQuiet Pure Power L7-350w)
But the only thing that really pissed me off (sorry for swearing) is the too high voltage and the high temp. so the idiot that is me thought "Why not use an HIS IceQ² HD 7970 GHz Bios to unlock voltage"
Now I'm sittin here and when I'm turning my PC on it stays for about 4 seconds on and 2 seconds of them the GPU fans are at 100% and then it just restarts and the whole process begins again.
Do you think my PSU doesn't deliver enough perfomance to even boot up my PC now?
because when i plugged out the 6 pin pcie connector off the card and just left the 8pin the computer startet and post but (of course) no video off DVI

My system
i5 2300
16gb RAM
XFX Radeon HD7970 Double Dissipation
2 Hard Drives
BeQuiet L7-350w PSU

 

[Archaic59]

Minimum power requirements for your system is 550 watts from a high quality power supply with two 6+2-pin PCIe power cables. You should upgrade asap.

 

[radekmm]

But the thing is it worked properly before Bios flashing and after the bios flash it acted so strange. I don't think it's a GPU or Bios brick as if it would only be a bios/gpu brick the systen wouln't repeatedly restart after 4sec

 

[radekmm]

bump
plz guys i really need help, because i've found a Seasonic md12d 750w psu for 30€ and i don't want to spend the money just to see the gpu being bricked or not

 

[Archaic59]

But the thing is it worked properly before Bios flashing and after the bios flash it acted so strange. I don't think it's a GPU or Bios brick as if it would only be a bios/gpu brick the systen wouln't repeatedly restart after 4sec

You may have messed things up with a bios update, but you still don't have the right power supply for your system.

 

[radekmm]

But the thing is it worked properly before Bios flashing and after the bios flash it acted so strange. I don't think it's a GPU or Bios brick as if it would only be a bios/gpu brick the systen wouln't repeatedly restart after 4sec

You may have messed things up with a bios update, but you still don't have the right power supply for your system.

even if, the gpu isn't supposed to do things like that when the bios is bricked

 

[Archaic59]

The i5 has iGPU. Try removing the 7970 and connect the monitor to the motherboard vga or dvi whatever it has and see if it boots with onboard graphics. If it boots you probably bricked the GPU unless you can flash it again which may or may not even help.

 

[radekmm]

i already tried removing the 6 pin pcie connector and leaving the 8 pin pcie connector in the card and the system posts and probably went into windows too but when i plug in the 6 pin power connector in again it acts like that again. and as i said, even if the gpu is broken, it probably wouldn't act like this. and also I've watched online that the HIS 7970 IceQ² GHz has 2x8pin connectors, 150+150+75= 375w and afaik the gpu is trying to draw the full 375w at startup + 95w for the CPU =470w, that's over it's peak power. and afaik PSUs aren't likely to run over their designed power and definantly not over their peak power. it worked before because here it only tried to take 300w instead of 375w and 300+95w for the cpu is still under the peak power of the PSU and therefore it worked

 

[Archaic59]

Back to my first reply. You don't have enough power for the video card. The quality of your power supply is bad also. Just because it worked for a while with one power cable does not mean everything was ok. If the video card works or not you still need a better power supply.

 

[radekmm]

I'll try and get that seasonic 750w psu tomorrow and reply back to you