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I am new to building computers and i have a question on Ram.

 

First off, here's my build so far: 

 

 
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor  ($229.00 @ Canada Computers) 
Motherboard: Gigabyte GA-Z97X-Gaming 3 ATX LGA1150 Motherboard  ($109.99 @ NCIX) 
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory  ($88.99 @ Memory Express) 
Storage: Samsung 840 EVO 250GB 2.5" Solid State Drive  ($119.98 @ DirectCanada) 
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card  ($406.43 @ DirectCanada) 
Case: NZXT H440 (Black/Red) ATX Mid Tower Case  ($114.99 @ Canada Computers) 
Power Supply: Corsair RM 750W 80+ Gold Certified Fully-Modular ATX Power Supply  ($148.40 @ TigerDirect Canada) 
Operating System: Microsoft Windows 8.1 (OEM) (64-bit)  ($96.98 @ DirectCanada) 
Total: $1372.75
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-28 20:04 EST-0500
 
(BTW: I know i don't have a cpu cooler yet, I made a post about it, click here if you want to help : http://linustechtips.com/main/topic/259806-advice-on-a-closed-loop-liquid-cooler/ thanks!)
 
So here's my interrogation: I will have 8gb of rams ( 2 x 4gb ). Can I add another 8gb ( 1 x 8gb ) or it absolutely need to be the same numbers of sticks?  what are the restrictions about adding Ram?
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You have to make sure that your dual channel kit are properly installed ( in the color matching slots ), but you should be able to add the single 8 gb stick after that just fine. Keep in mind a second 2x4gb(2x4 + 2x4) kit will perform slightly better than a single 1gb(2x4 + 1x8) stick. I am also not sure if you will be able to add a second non dual channel 8gb( 2x4 + 1x8 + 1x8) stick without problems.

 

*Edit*

Also remember that you all of your RAM will perform at the speed of the slowest stick installed.

Intel Core i7 4790K >> MSI Z87I Gaming AC (MS-7887) >> G.Skill Ripjaws 2133 16GB >> Zotac GTX 980 >> Corsair 250D >> Samsung 840 Evo 250GB >> OCZ ModXStream Pro 600W >> Acer K2 27" Widescreen LED Monitor  (K272HLBMID) >> Ducky DK9087 Shine 3 MX Brown Switch Red RGB LED 87KEYS Mechanical Keyboard >> Mionix Avior 7000 >> HyperX Cloud

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You have to make sure that your dual channel kit are properly installed ( in the color matching slots ), but you should be able to add the single 8 gb stick after that just fine. Keep in mind a second 2x4gb(2x4 + 2x4) kit will perform slightly better than a single 1gb(2x4 + 1x8) stick. I am also not sure if you will be able to add a second non dual channel 8gb( 2x4 + 1x8 + 1x8) stick without problems.

 

*Edit*

Also remember that you all of your RAM will perform at the speed of the slowest stick installed.

 

Thanks for the feedback! it helps a lot !

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