I have an early 2009 mac pro that I want to upgrade my graphics card to a GTX 6600. Will this power cable work to provide power to this graphics card?

This is just a PCIe extension cable. If you dont have a PCIe plug on your psu wiring you will need a 4 pin molex to PCIe adapter cable.

I need another two cables to reach from my modular power supply to my second graphics card. will this accomplish that?

Yes it will, as long as your card uses 6 pin connectors. (PCI Express slots provide 75W of power, 6 pin connectors each add an additional 75W of power while 8 pin connectors add 150W.)

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StarTech.com PCIEPOWEXT 8 in. 6 pin PCI Express Power Extension Cable Female to Male

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Style: -- select one --

2xLP4 to 8 Pin
6 to 8 pin
6 Pin Extension
6 Pin Splitter
2xLP4 to 6 Pin

2 Connector Number
Black
Female to Male

Overview

Specs

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8in 6 pin PCI Express Power Extension Cable

Model
Brand	StarTech.com
Model	PCIEPOWEXT
Type	Extension Cables
Type	Cable Connectors
Color	Black

Details
Length	8"
Cable Length	8 in.

Connectors
Connector A	1x PCIe 6pin female
Connector B	1x PCIe 6pin male
Connector Number	2
Terminal Gender	Female to Male

Details
Specifications	Wire Gauge: 18 AWG

Features
Features	Reduces strain and eliminates stress on the PCIe graphics card power supply connection Durable 6-pin PCIe power connectors Easy to use and install Thin and flexible, yet durable cable design

Group
Cable Length	0.5 ft.

Additional Information
First Listed on Newegg	September 17, 2025

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Item#: 9SIA1K6KKC0263

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StarTech.com PCIEPOWEXT 8 in. 6 pin PCI Express Power Extension Cable Female to Male

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Customer Reviews of the STARTECH PCIEPOWEXT

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Warranty, Returns, And Additional Information

Warranty

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Manufacturer Contact Info