Single vs Dual RAM?

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Dear Forum,
 
Will 2 of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231313
 
Do the same as 2 of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231278
 
only with twice the capability?
 
I am using an i5 2500K with a http://www.newegg.com/Product/Product.aspx?Item=N82E16813128523 mother board.
 
Thank you!
 
Sincerely,
Mike

[nixie]

I've always had better performance with Dual-Channel Motherboards to use matched pairs vs running Single-Channel single stick.

I'd go with 2 - 2GB sticks vs a single 4GB stick to tap into the dual-channel memory processing.

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Hi Nixie, Thanks for the response!
Do you know if there is something special about dual sticks vs two singles?
Thanks!
Mike

[nixie]

If you buy a package of 2 sticks they are usually a tested matched pair by the mfr, yet I have rarely had issues with buying 2 same single packaged sticks to dual-channel up. Only had 1 problem a while back with some Cheap PNY sticks acting up. Memtest86 showed that they didnt like to play well together. Bought another stick at staples which matched up to the other running memtest86 to test and stress them. When all was well I brought the opened package with single stick that didnt play well with others back to staples for a refund as defective, even though when it ran by itself, it ran ok and passed memtest86.

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Thanks Nixie, Great information!
I think I will try the two 4G sticks. Twice the RAM for the same price. Thanks for the testing tip. I will try it!
Sincerely,
Mike