This is a new replacement upgrade power supply for a Dell OptiPlex GX270 Tower. This has a higher maximum power rating and capacity, also this power supply offers additional power protection features. This is guaranteed to work as a direct replacement for the Dell OptiPlex GX270 Tower power supply. This is not a Dell OptiPlex GX270 Tower brand/model, This is an aftermarket replacement as pictured and described in this item description. 

Connectors Includes:
1 x 20+4 Pin ATX - compatible with 20 pin or 24 pin
1 x 4 pin ATX-12V
1 x 8 pin EPS-12V
1 x 6 pin Dell Aux 
1 x 6+2 pin PCIe - compatible with 6 pin or 8 pin
1 x 4 pin HP Video
4 x 15 pin SATA
3 x 4 pin Molex
1 x 4 pin Floppy

Dimensions:
5.86" x 3.3" x 4"
101 x 148 x 83 MM

Specifications:
300 watts max
Input voltage: 115/230 Volts AC
Frequency: 60/50 Hz
MTBF:         100,000 hours on maximum load at +25°C
Rise time:        Less than 70 ms
Hold-up time: 17 ms minimum at nominal input voltage
Output
Voltage +5V   -5V    +12V1   +12V2   +3.3V   -12V   +5V-SB
Current 13A   0.5A    14A       14A       13A     0.5A    2.5A

Shipping:
*All orders process and ship same day if paid by 3:00 PM EST Monday - Friday

Return Policy:
30 day no hassle return policy. If you are unsatisfied or do not want the item for any reason, simply return the product for a full refund.

Warranty:
1 year on parts and labor

Sales Tax:
Michigan residents are required to to pay 6% sales tax.

International Buyers/Import Duties:
International buyers are responsible for import duties in their country if they exist. 
Do not buy this item if there are import restrictions for the item in your country.

F.A.Q - Frequently asked Questions
I was wondering if this item can be used as a DIRECT (the cables just plugs in/fits straight in with no hassles) replacement for a Dell OptiPlex GX270 Tower Power Supply?
Yes, this power supply will fit your Dell OptiPlex GX270 Tower perfectly. This will be the same size and dimensions, also this will have all the correct connectors that you need and more.

This replacement unit says it is 300 watts, that is higher than what is currently in my computer, are you sure this will work?
The 300 watts is a maximum output. This will work perfectly with your application.Think of it as extra power if it is needed. Otherwise it just uses the amount it needs. 

The values listed for output current are higher than on the original. I am assuming that this is not a problem as these values are only what it is capable of delivering, but I just wanted to make sure that this unit is definitely compatible despite the differing values.
Yes, This will work perfectly as a replacement and upgrade for your  Dell OptiPlex GX270 Tower, this is designed to work perfect as a replacement for your unit. This is also an upgrade as it is a higher wattage; which can handle more devices: hard drives, dvd-roms, Ram or CPU if you choose to add them. 
This power supply also adds higher efficiency and a low noise fan. Further, this power supply is newly manufactured with newer components internally as well as over voltage protection, over power protection, short circuit protection, low noise and ripple fan, Energy star efficient.
That's why this exceeds getting an exact replacement that was most likely manufactured years ago with older parts/technology; and capacitors go bad over time, even when not is use. Plus this comes with a one year manufacture warranty.