Are 6 pin pcie cable that ship with Mac Pro adequate to power newer Nvidia Cards

avkdm

macrumors regular
Original poster
Feb 14, 2012
154
42
Hi Guys,
I did a search and can't find an answer.My 5,1 MP shipped with 2x5770, are the 2x6 pin stock connectors adequate enough to power a GTX570? They seem a lot thinner gauge wire than the 3rd party ones that MacVidCards supplies.
I read here that MacVidCards said the GTX570 can pull up to 110 watt from each connector.
http://forums.macrumors.com/showthread.php?t=1652569&page=2
 
Last edited:

avkdm

macrumors regular
Original poster
Feb 14, 2012
154
42
Sorry guys, after a bit more searching I'm pretty sure the answer is Yes
 

IowaLynn

macrumors 65816
Feb 22, 2015
1,307
288
Hi Guys,
I did a search and can't find an answer.My 5,1 MP shipped with 2x5770, are the 2x6 pin stock connectors adequate enough to power a GTX570? They seem a lot thinner gauge wire than the 3rd party ones that MacVidCards supplies.
I read here that MacVidCards said the GTX570 can pull up to 110 watt from each connector.
http://forums.macrumors.com/showthread.php?t=1652569&page=2
The rest of that post:

the one that plugs into the 8 will draw 110 watts if stressed

And GTX 570 were usually one 6-pin and one 8-pin

PCIe rail - 75W
6-pin connectors - 75W
8-pin is 150W

A GPU would have to pull less than 225W at full stress to safely work with two 6-pins
 

avkdm

macrumors regular
Original poster
Feb 14, 2012
154
42
The rest of that post:

the one that plugs into the 8 will draw 110 watts if stressed

And GTX 570 were usually one 6-pin and one 8-pin

PCIe rail - 75W
6-pin connectors - 75W
8-pin is 150W

A GPU would have to pull less than 225W at full stress to safely work with two 6-pins
My GTX570 has 2x6 Pins -it seems to be working OK, however I dont want it to kill my system by drawing too much power.
 

IowaLynn

macrumors 65816
Feb 22, 2015
1,307
288
My GTX570 has 2x6 Pins -it seems to be working OK, however I dont want it to kill my system by drawing too much power.
According to this, 219W though there can be individual differences in models, eVGA had a number of, OC, SC etc. The 2.5GB VRAM model was popular for its VRAM and CUDA with Adobe users.
 

avkdm

macrumors regular
Original poster
Feb 14, 2012
154
42

xcodeSyn

macrumors 6502a
Nov 25, 2012
548
4
My GTX570 has 2x6 Pins -it seems to be working OK, however I dont want it to kill my system by drawing too much power.
Your 6-pin cables were built with some headroom just like any other parts, so occasionally they could withstand up to 110W even though they are rated for 75W. The MacVidCards' quote you mentioned earlier was addressing FurMark which is a questionable benchmark application. You'll be fine as long as you are not obsessed with running that particular benchmark. Here is a further elaboration on the same topic in case you are interested.