• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

7900GT Running without PCIE power?

D

dme92189

Senior member
So...I get my new 7900GT, plug it in, and use a converter cable to convert two molex 4 pins into one pcie 6 Pin to power my gpu, but every time i try to start my comp up, it powers on for a split second and dies. Now I am using a DFI SLI-DR board and a 550W enermax psu. Then i tried running the system without pluggin in the 6 pin power connector and it runs and is running games stable... DFI boards have you plug in the 24 pin atx conn, the 4 pin 12v conn, and then also a 4 pin moles and floppy power conn into the board, so what I need to know is if the system is runnign stable without the 6 pin power, is that ok? The gpu is getting adequate power? Thanks guys!
 
That is really strange. I know the 7600GT cards don't need a 6 pin PCIe adaptor b/c they can draw all their power from the PCIe slot. SInce the 7900GT is built on similar architecture (more pipelines and lower clocks), maybe it too doesn't draw quite enough power to need the 6 pin?
 
Ok, sure. But then why does my system not power up (fans spin for a split second and then stop) when I have the plug connected for the 6 pin? Thanks for the help btw!
 
I had that issue for a while, but not related to the GPU 6 pin. Try resetting your PSU by turning it on and off. If that doesn't work try a different power cable and plug it into a different socket in the wall. Also check the 6 Pin cable for damage. Other than that, I don't know what to tell you.
 
Are the two 4-pin connectors on the same length of wire? If so, try using two 4pin molexes on separate lengths of wire.
 
yeah, the 7900GT definitely requires an external power source. when i forgot to plug mine in, it yelled at me in windows and i think it turned down the frequency or something as a safeguard. i plugged it in using the molex-to-pcie adapter though and it worked fine. since the molex adapter requires 2 molex for one pcie, maybe you should try hooking each molex plug up to a different power supply cable. it's possible that a single cable can't supply enough juice.
 
ok, tried different power cables, slots. nothing
The two 4 pin conns are not the same length of wire and I am using plugs that come directly from the psu, not pass throughs or y splitters.
When I tried the power up with the bare settings, still didnt work. The only way the system powers on is if i dont connect the 6 pin pcie conn.
 
Hahah! Got it! The power adapter i bought was wiring a wrong wire to the GPU, it was sending a current to a pin that was supposed to be grounded!
 
Originally posted by: dme92189
Hahah! Got it! The power adapter i bought was wiring a wrong wire to the GPU, it was sending a current to a pin that was supposed to be grounded!
Click to expand...

😛 own3d.

Anyway why did you BUY an adapter, it should come with one...
 
Originally posted by: dme92189
Hahah! Got it! The power adapter i bought was wiring a wrong wire to the GPU, it was sending a current to a pin that was supposed to be grounded!
Click to expand...

Lucky your PSU was intelligent enough to cut out before something blew up.
 
Originally posted by: gobucks
yeah, the 7900GT definitely requires an external power source. when i forgot to plug mine in, it yelled at me in windows and i think it turned down the frequency or something as a safeguard. i plugged it in using the molex-to-pcie adapter though and it worked fine. since the molex adapter requires 2 molex for one pcie, maybe you should try hooking each molex plug up to a different power supply cable. it's possible that a single cable can't supply enough juice.
Click to expand...

my 6800GS yelled at me too. the card does need that power. you would be wise to provide.
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top