10-02-2010 11:45 AM
About to rcv W510 which I purchased with 1 stick of 2 gig Ram DDR3 PC3-8500 at 1067mhz.
Running W7 64 bit OS with
Intel® Core™ i7 processor i7-620M (2.66 GHz) with dual core
1) Will buy two 4-gig sticks AND the price (@$129) is identical from 3rd party website; seems like I should buy the faster DDR3 PC3-10600 at 1333mhz rather than DDR3 PC3-8500. But given that the Intel processor memory controller only goes up to 1066 mhz it seems that the faster memory while compatible will NOT result in much actual performance benefit.
DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.5V • 512Meg x 64 •
Is this correct choice
2) From another thread and from Lenovo knowledge base I know to install the new Ram in slots 0 and 2.
The same (http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-75886) Lenovo advice indicates it is fine to then use the originally purchased Ram in slot 2. Presumably this will still allow for Dual Channel memory operational benefits. Do not want to have to dig under keyboard more than once so want to make sure that I am not missisng something. It seems that several years ago in order to have Duan Channel you needed to have an even number of slots filled.
Solved! Go to Solution.
10-02-2010 12:26 PM
1) I believe it's right, the 620M series only use 800/1066 Mhz RAM and the quad cores 720QM and up use 1066/1333 Mhz. So that being the case you'd be better off with the slower speed memory since it will have a lower latency usually around 7 for PC3-8500.
2) This I'm not sure about if you can put it in wrong order and still be in dual channel. As for the proper placement according to Lenovo. For dual channel, you need your combinations to go Slot 0/1 (so 1 inside the keyboard the top part and one in the bottom side of the laptop (left)). Since you want to add your 3rd one it would go inside the keyboard underneath which is slot 2. I believe you will still get dual channel mode for at least the 2x4gb, don't know how the 2gb behaves but it will run just fine. I've had 2x4gb and 1x2gb running for about a week before I upgraded to 4x4gb total.
10-02-2010 12:37 PM
Thx for your reply and somewhat similar exp. Your answer to part 1) which may be accurate seems somewhat puzzling. I am not real tech savvy and do not understand your reference to better latency for the slower Ram.
The part that is puzzling (but prhaps simply explained by Lenovo greed) is that on the W510 customize page where the highest processor choice is
Intel Core i7-620M Processor (2.66GHz, 4MB L3, 1066MHz FSB)
Lenovo offers amongst others 2 choices for a total of 4-gig Ram build:
Namely the same two choices that I can get from a 3rd party
HOWEVER Lenovo is happy to charge $130 extra for DDR pc3-10600 which you indicate might actually perform more poorly than the Lenovo lower cost PC3-8500 choice.
Glad that I am asking, but this is certainly puzzling to me.
10-02-2010 02:19 PM - edited 10-02-2010 02:20 PM
Well I could be mistaken of the speeds for the RAM, but I'm going off by intel's website for each processor. the dual cores for mobile processors 520M, 620M or the new 540/640M are DDR3-800/1066 while the quad cores 720/820QM 740/840QM or extreme cores 920/940XM are DDR3-1066/1333. The faster memory as long as it is DDR3 can be used with the lower specs but it will run at the lower speed. As for lower performance it can't be really compared directly 7 clock latency @ 1066Mhz vs 9 lat @ 1333Mhz since the clock cycles are different. While it takes shorter amount of clock cycles for the 7, each cycle is slower too.
But yes for that particular processor it would be less of a benefit. As for why Lenovo has it up is probably because they have 3 different links and all share specifications since all 3 are the exact same models just different website configuration options. So if you clicked on one of the other W510 customize links you will see the options for the i7-720QM and i7-820QM; plus the 3rd link has the i7-92XM extreme core as an option.
Don't worry too much about the memory, just don't get the absolute cheapest with riduclous looking numbers. I personally don't care for the prices Lenovo has for their memory but there is nothing wrong with theirs. I paid $97 for 2x4gb then an additional $178 for 2x4gb after the $20 mail in rebate. But that was for OCZ DDR3 PC3-10666 1333Mhz 9-9-9-20 timing.
You'll rarely experience any major differences in the long run unless you are running benchmarks and absolutely need the best of everything for some reason. For the 620M stick with the norm of pc3-8500 @ 1066Mhz average price should be $80-90 for 1x4gb
Also some people may just want the faster speed memory if they plan to upgrade down the road.
10-02-2010 02:54 PM
Thx for clear descrition. Now I know wha to do. I realize I had jsut gone to a memory website suggest on a photography forum and did not really shop around. I will be able to save even more money over the Lenovo pricing and still get quality. I do not do games or edit video or audio so do not need the fastest by any means. Again thank you.
10-02-2010 06:41 PM
I posted this in an other thread but it appears to apply here also:
From Crucial in response to my question about which 4GB RAM modules I should buy for my W700:
There is no significant increase in performance between PC3-8500 & PC3-10600. RAM speed affects overall system performance very little.
10-02-2010 10:09 PM
Interesting comment from Crucial who is a well respected mfg of Ram. I would expect that for some situations and for some multi-taking scenarios that a faster Ram speed keeping the amount of Ram constant would probably hae a slight advantage but I know more about software than about hardware so don't quote me on this. While slightly out of date this URL gives an excellent explanation of how dual channel memory works. http://www.hardwaresecrets.com/article/133
10-03-2010 12:31 AM
I do quite a bit of video encoding/editing with my W510 and recently upgraded it to 12 GBs of PC3-10666. I wished I had saved the money and went with PC3-8500 instead; I really didn't notice much performance increase beyond merely adding another 4 GB of RAM.
08-09-2012 03:26 AM
i have a w510 laptop with i7-820QM and 4Gb of 1333Mhz ram (it's a 2x2Gb)
i'm thinking of buying aditional 8Gb of RAM (2x4Gb) and i whant to know if the 1600Mhz is an option.