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RAM question: ASUS N53SN-XR2

post #1 of 2
Thread Starter 
I am about to buy this laptop and I want to know if it is compatible with 1600mhz RAM.

I know that it uses the PC3-10600 memory.

The description of the RAM I would like to upgrade to is:
=====================================================
Samsung 4GB DDR3 PC3-12800 1600MHz 204pin SODIMM VLP Module
Compatible with PC3-12800, PC3-10600, PC3-8500, PC3-6400
ASUS N53SN-XR2
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2630QM 2.0GHz turbo 2.9GHz Quad-core Intel HM65 Graphics: GT 550M 2048MB@1480 MHz, Nvidia Optimus 16GB DDR3 1333MHz 
Hard DriveOSMonitorMouse
Momentus 750GB 7200rpm + 2cdHDD 1TB WD ScorpioBlue Windows 7 Ultimate x64 Slim&Fast Everplex Edition LED Screen HD Kensington Blue Orbit Trackball with Scroll Ring 
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ASUS N53SN-XR2
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2630QM 2.0GHz turbo 2.9GHz Quad-core Intel HM65 Graphics: GT 550M 2048MB@1480 MHz, Nvidia Optimus 16GB DDR3 1333MHz 
Hard DriveOSMonitorMouse
Momentus 750GB 7200rpm + 2cdHDD 1TB WD ScorpioBlue Windows 7 Ultimate x64 Slim&Fast Everplex Edition LED Screen HD Kensington Blue Orbit Trackball with Scroll Ring 
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post #2 of 2
Thread Starter 
I just spoke with the experts over at ramexperts.com, he told me that it's not necessarily dependent on the motherboard (although of course to an extent, it is); rather, it is primarily dependent on the processor. Since the laptop I'm looking to get has a 2cd gen 2630QM quad core, then he said that yes, it should be compatible.

He also said that the PC3-10600 (1333MHz) actually has a lower latency than the PC3-12800 (1600mhz), but the significant mhz difference between the PC3-12800 and the PC3-10600 (almost 300mhz more per stick), especially when multiplied by 4 sticks (16GB), means that 4 x PC3-12800 is going to have a significant and noticeable improvement over 4 x PC3-10600.

Additionally, he said that if you mixed up 2x 4GB PC3-10600 and 2x 4GB PC3-12800, that the system would automatically revert to the lower mhz, thus rendering the extra 267mhz (1600-1333=267) on the 2x 4GB PC3-12800 useless. Further, it would also probably also revert to the higher latency, which means you would have the higher latency of the PC3-12800 and the lower mhz speed of the PC3-10600.

On the other hand, the latency difference is only in nanoseconds, so it really isn't much at all of a difference.

One last factor is of course price. See, my plan was to take my two PC3-10600 1333 mhz 4GB sticks out of my current laptop and put them in my new laptop, so that I didn't have to buy four RAM sticks.

Cost of the PC3-12800 is $50 for an 8GB kit,
and the PC3-10600 is $40 for an 8GB kit.
This means that to fully utilize the PC3-12800 higher 1600mhz speed, I would have to buy four sticks of PC3-12800, meaning spending an extra $100 on RAM upgrades. On the other hand, this would be slightly offset with the higher resale value of my current laptop with 8GB of RAM vs 4GB. It might be a realistic $20-$40 net resale value differentiation between 4GB and 8GB of RAM.

The alternative would be to use my current two RAM sticks, meaning spend $40 on the other two PC3-10600, and selling my current laptop with 4GB of RAM, meaning sacrificing a higher ram speed.

The final alternative would be to buy the four PC3-12800, and sell my current 8GB of RAM for a probable $25 after selling fees.

So the choice is between spending [$100 minus $25 (in any case)] = $75 for 16GB of 1600MHz, or to spend $40 for 8GB 1333MHz to total 16GB of 1333MHz RAM. Considering that 1333x4=5332MHz total vs 1600x4=6400MHz total, which is essentially the same as 5x1333Mhz RAM (6665MHz total), than the cost-benefit of spending an extra $35 for the equivalent of 2.5x more RAM than what I already have vs only 2x more (a 20% increase) means that both options are essentially exactly the same. So, it seems that I might as well go for the greater amount of MHz and fork out the extra net cost of $35.
Edited by everplexmedia - 10/12/11 at 10:41am
ASUS N53SN-XR2
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2630QM 2.0GHz turbo 2.9GHz Quad-core Intel HM65 Graphics: GT 550M 2048MB@1480 MHz, Nvidia Optimus 16GB DDR3 1333MHz 
Hard DriveOSMonitorMouse
Momentus 750GB 7200rpm + 2cdHDD 1TB WD ScorpioBlue Windows 7 Ultimate x64 Slim&Fast Everplex Edition LED Screen HD Kensington Blue Orbit Trackball with Scroll Ring 
  hide details  
Reply
ASUS N53SN-XR2
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2630QM 2.0GHz turbo 2.9GHz Quad-core Intel HM65 Graphics: GT 550M 2048MB@1480 MHz, Nvidia Optimus 16GB DDR3 1333MHz 
Hard DriveOSMonitorMouse
Momentus 750GB 7200rpm + 2cdHDD 1TB WD ScorpioBlue Windows 7 Ultimate x64 Slim&Fast Everplex Edition LED Screen HD Kensington Blue Orbit Trackball with Scroll Ring 
  hide details  
Reply
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