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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2 Connector Number
Black
Female to Male

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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	August 19, 2011

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): Lifetime
Limited Warranty period (labor): Lifetime
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Return Policies

Return for refund within: 45 days

Return for replacement within: 1 year

This item is covered by Newegg.com's 45/1 Return Policy.
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Manufacturer Contact Info

Manufacturer Product Page
Manufacturer Website
Support Phone: 1-800-265-1844
Support Email: [email protected]
Support Website
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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

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Manufacturer Contact Info

Item#: N82E16812200975

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

Learn more about the STARTECH PCIEPOWEXT

Customer Reviews of the STARTECH PCIEPOWEXT

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info