Solved Max RAM speed supported by an ASUS CG5275 Deo

August 11, 2011 at 17:19:29
Specs: Windows 7-64bit, Corei5-650/8GB 1333
I want to replace all the existing RAM in my ASUS Essentio CG5275 PC with 4 new sticks of 4GB 12800/1600 RAM. I want to remove all the existing 10600/1333 RAM in it now. The motherboard is an ASUS P7H55-M modified at the factory with the overclocking features and timings access for the RAM removed in the BIOS.(as per their tech support)
Crucial site say's yes but I'm not positive they are correct due to the reasons listed in my first post. I want to make sure that I can utilize the faster RAM and not just be able to use it at a default 1333 speed because of my motherboard. I'm going to be running some intensive 3D drafting software is why I want the additional RAM and speed. There is a Corei5-650 first Gen CPU in it now.
Thanks for your input

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August 11, 2011 at 18:01:01
✔ Best Answer
The memory controller is in the CPU, not the motherboard. Your CPU supports up to DDR3-1333.

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August 11, 2011 at 18:38:47
No Kidding! I was not aware of that. So the Crucial mem calculator was WRONG!
I read that the i5 CPU can be overclocked to accept the DDR3-1600 speed, thats if ASUS left the board intact with OC features, is this correct would you know? Moot point since I can't OC but it's good to know. So 1333 with the quickest CAS is the best I can do right now. I'm curious as to why the crucial error.
Thanks so much for a quick and correct response!

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August 12, 2011 at 11:19:07
"So the Crucial mem calculator was WRONG!"

Not exactly. You can run DDR3-1600 (or faster) if you want, but the memory controller will downclock it to DDR3-1333 speed unless you overclock.

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