X200 + additional memory (GSkill PC10666 DDR3)?

Hi Guys



I just got my new X200 and generally quite happy about it.

I need to install additional memory to it since i only got the 1Gb installed.



I found a good deal for:



GSkill 2GB PC-10666 (1333MHz) 200-pin SO-DIMM DDR3



Could any of you please advise me whether I can install this memory with the 1Gb memory that's already installed onboard?

I think the speed is a bit different?

I don't mind if this memory will run at a step down speed.

I am more worry about the compatibility.

Thank you.

 

By speed do you mean memory timings? Because both of these are 1066MHz DDR3. I believe the RAM that came with your machine should be 7-7-7; is this RAM 9-9-9 or similar? If so, the 7-7-7 RAM should automatically slow down to match (memory is held down by the weakest link in the chain), and will run fine. However, if you can afford 7-7-7 RAM, I would suggest that instead.

 

Thanks for the reply.
I am referring to the memroy speed.
According to the lenovo spec
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-55644
The memory speed is 1066Mhz (PC8500)
The Gskill memory speed is 1333Mhz (PC10666)

However, you are right. The ram is 9-9-9-24.
Where did you find the info on the spec of the ram lenovo provided?

 

let's not get confused here.   1066 MHz memory with 7-7-7 latency timings are equivalent to 1333MHz memory with 9-9-9 latency timings.   if you downclock DDR3-10666/9-9-9 memory to 1066 MHz, its CAS timing will be 7-7-7.

also keep in mind that as memory clock speed increase, so must latency.   look back on the days when 100 MHz module CAS latency was a paltry 2-2-2.   this is why you can't compare latency numbers alone.

http://en.wikipedia.org/wiki/CAS_Latency

besides, are you sure the X200 can use PC3-10666 modules at 1333 MHz?   the X200's memory bus might be locked at 1066 MHz just like the older DDR2 systems are locked at 667 MHz.

 

I'm pretty sure the memory bus is locked at 1066MHz. This means that any 1333MHz DIMMs would downclock to 1066MHz anyway (this may improve latency to 7-7-7, but I'm not sure about this).

Conclusion, the high speed memory will work fine, but I wouldn't pay a price premium for it (1066MHz, 7-7-7 is about as good as you will get in this machine).

 

it will.   here's the math...

1066 / 1333 = 0.8 reduction factor
CAS 9 * 0.8 reduction factor = CAS 7

so, you can see that 1066 @ 7-7-7 has the exact same CAS latency as 1333 @ 9-9-9.

math, FTW!

of course, all numbers above are rounded to the closest decimal (same as the manufacturers).

 

It's strange that the CAS Latency on Lenovo's parts website for the PC8500 DDR3 SoDimm is "5 clock cycles"

It's not 7!!!
Is this correct?

 

Check the label on your memory itself (remove the cover and check). This is the only way to be sure. Lenovo's website is rather notorious for misprints.

 

Thanks. When I got home i will do that and let you guys know.

btw,how can I get to the bios in X200.
I tried to press Ctrl+P last night and it ask me for a password?

 

Try F12 at boot, and select setup. If it asks for a password try using a blank one or swiping your fingerprint (if you have the reader).

 

Hi Guys.

Got some pics about the memory in my X200 now.
Could anyone please help me out here and tell me whether this is a CAS 7 Sodimm? Thanks

 

yes, it is.