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Non compatible ram working fine, why?


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7 replies to this topic

#1 FlyerX

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Posted 12 December 2012 - 12:04 AM

Hi guys!



I have purchased a laptop for my mom... and i have interchanged the ram between the new and my old one (4gb of ram for my mom is too much and i need it lol).

Here the data:



My laptop:
manufacturer recommends : 533mhz or 667mhz DDR2 SDRAM
And it has installed : x2 1GB 2Rx8 PC2-5300S-555-12

the new laptop:
manufacturer recommends : 800 DDR2 SDRAM
And it has installed : x2 2GB 2Rx8 PC2-6400S-666 12-E1


I have switched the memories; i put the x2 2gb of the new laptop in my old one and my x2 1gb in the new laptop.

So the new configuration is as follow:

My laptop
manufacturer recommends : 533mhz or 667mhz DDR2 SDRAM
And it has installed : x2 2GB 2Rx8 PC2-6400S-666 12-E1

the new laptop:
manufacturer recommends : 800 DDR2 SDRAM
And it has installed : x2 1GB 2Rx8 PC2-5300S-555-12

Everything is working fine but i want to know if there is something i should worry about what i did (despite i still dont know how 800mhz are working in my 533-667mhz system and how the new 800mhz laptop is working with 667mhz ram memory since memories are out of the recommended)

http://www.freeimagehosting.net/1vhnu
http://www.freeimagehosting.net/vbda9

Edited by FlyerX, 12 December 2012 - 09:29 AM.
Moved to internal hardware from Windows 7. ~ OB


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#2 billy gates son

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Posted 12 December 2012 - 01:19 AM

This a hardware question, not windows 7
the BIOS settings are probably in auto for the ram or they corrected themselves when you booted up with different ram installed
do you have CPU-Z ? www.cpuid.com/softwares/cpu-z.html
it will tell you what speed the ram is running at that computer.

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#3 Darkbat

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Posted 12 December 2012 - 01:22 AM

FlyerX,

There is nothing wrong with what you did as long as the system is booting However, If you are over your manufacturer specs then more than likely you are not getting the full speed of the memory as your mother board is throttling it down to the slower speed. As that is as fast is it is able to communicate. We would need to know the Motherboards in the systems to determine what your systems will be able to support for memory speeds. IF you run http://www.piriform.com/speccy we will be able to determine what the limitations are in black and white but it is a decent bet that you are choking the memory on the slower system.


So to break it down
2Rx8 PC2-6400S-666 12-E1

2R - Means it is dual rank nothing helpful for this
x8 - Density of the Memory modules on the chip
PC2 - Memory module stating it is DDR2
6400 - To show the transfer rate in MB/S
S - Laptop memory
666-12 Is the timing level


Good Memory Article to explain clocking:
http://www.hardwaresecrets.com/article/Understanding-RAM-Timings/26

#4 FlyerX

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Posted 12 December 2012 - 09:49 AM

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#5 hamluis

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Posted 12 December 2012 - 01:16 PM

Simply put per http://en.wikipedia.org/wiki/DDR2_SDRAM .

"Higher-speed DDR2 DIMMs are compatible with lower-speed DDR2 DIMMs although the motherboard or CPU memory controller will be bound to the limits of the lower-performance modules."

Nothing to worry about :).

Louis

#6 FlyerX

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Posted 12 December 2012 - 11:07 PM

OK, That's all i need

Thank you guys!!

how do i mark this as solved?

Edited by FlyerX, 12 December 2012 - 11:07 PM.


#7 hamluis

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Posted 13 December 2012 - 03:37 PM

:thumbup2: , no need to mark anything :). We don't keep count of "solved" versus "unsolved" topics :).

Louis

#8 FlyerX

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Posted 13 December 2012 - 11:29 PM

Cool. Thanks!




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