Is a matching pair of Ram required to run an iMac 1.83Ghz Intel Core 2 Duo?

I have an iMac 17" 1.83Ghz Intel Core 2 Duo with the standard 512mb ram (2x 256mb) installed. If I replace one of the memory slots with one 1gb ram stick, and leave one 256mb ram stick (1.256gb ram total), will my system run properly? Will it run at its optimal performance level? Or will Installing 2 sticks of 512mg ram perform better?
Also, is 1gb - 1.256gb ram enough to run parallels (windows xp) smoothly?
Thanks in advance.

Hi Jay
Welcome to Apple Discussions
First use the link below:
How to identify your iMac
If you have a 17-inch iMac (MA710LL) Intel GMA 950 graphics processor with 64MB of DDR2 SDRAM shared with main memory then YES you need to keep the ram matched in that model.
iMac (Early 2006), iMac (Mid 2006), iMac (17-inch Late 2006 CD): Memory Specifications

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http://www.everymac.com/systems/apple/macbook_pro/stats/macbook-pro-core-2-duo-2 .33-15-specs.html
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Message was edited by: Dr. Z.
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Is it possible to upgrade the 10.5.8 OS on a MacBook Pro with a 2.4 GHz/Intel Core 2 Duo with 2 GB of RAm to the latest OS?

The first step in Upgrading... is to Snow Leopard = OS X 10.6.x
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http://roaringapps.com/apps:table
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It is important to get the Correct and Matching RAM
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Is a matching pair of Ram required to run an iMac 1.83Ghz Intel Core 2 Duo?

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