GPU Power Cord Question

Missionhcky09

Commendable
Jul 8, 2016
2
0
1,510
Hello,

I recently bought a gigabyte gtx 1070 g1 gaming. Previously had a gigabyte gtx 670 windoforce.

When installing the 1070, it only had one 8 port power cord. The 670 had a 6 and 8. I took the 8 pin that was in the 670 and plugged it in. It turned on fine but had a few screen stutters.

Because of the slight freezing/stuttering, I decided to check out the power cord and noticed it had 6 wires going into the 8 pin adapter.

It's been a while since I built my PC and I don't remember if that was normal. I believe I read the two ports missing were just ground wires but im not sure...

The power supply is at least 700 watts from memory, but I can get the model number when I return home.

Thanks!

 
Solution


Yes. Odd as it sounds, the 75W cable feeding the 6-pin connector only requires a pair of +12V and pair of grd wires. (#20 AWG, I believe) The 150W 8-pin spec calls for adding the extra +12V and grd wires making the total of 3 x +12 and 3 x grds. A pair of extra grd wires were added for stability. I...

clutchc

Titan
Ambassador
If your PSU ran the GTX 670, it should be able run a GTX 1070. If all connections are tight and you installed the correct driver, it should be fine. If not, I would suspect the new card...
I presume you already tried the obvious like uninstalling the old driver first.
 

Missionhcky09

Commendable
Jul 8, 2016
2
0
1,510


I'm out of town now but yes I did reinstall drivers. My main question was the power supply question. The 8 pin connector only has 6 wires, is that normal?

 

clutchc

Titan
Ambassador


Yes. Odd as it sounds, the 75W cable feeding the 6-pin connector only requires a pair of +12V and pair of grd wires. (#20 AWG, I believe) The 150W 8-pin spec calls for adding the extra +12V and grd wires making the total of 3 x +12 and 3 x grds. A pair of extra grd wires were added for stability. I also believe the spec increased the wire size to #18. But I'm a bit foggy on the wire sizes. Someone may have to jump in and correct that if I'm wrong.
 
Solution