Welcome to the MacNN Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Notebooks > 533Mhz DDR2 SODIMM in MacBook

533Mhz DDR2 SODIMM in MacBook
Thread Tools
Dedicated MacNNer
Join Date: Apr 2003
Location: Leawood, KS
Status: Offline
Reply With Quote
Apr 7, 2007, 05:14 PM
 
Hi,
I have a 2.0Ghz MacBook Core 2 Duo Notebook. It originally came with 1GB (2x512) DDR2 667Mhz Memory. However, I had some old memory from my old notebook that used DDR2 533Mhz SODIMM Memory. I used those 2 1GB SODIMMS to upgrade to 2GB of memory. However, after 5 Months, I did not realize until now that the memory is 533Mhz, not 667Mhz. Does it make that much of a difference I am using 533Mhz memory? Will I notice a difference if I were to get 667Mhz memory instead? It is working perfectly with 2GB of DDR2 533Mhz SODIMM memory, but am I holding my system back alot?
Thanks, Paul
15" PowerBook 1.5GHz (CTO): SuperDrive, 5400rpm 80GB 16mb Cache, 1.5GB RAM/Backlit Keyboard/Radeon 9700 128MB/MacOS X 10.4.2
     
Professional Poster
Join Date: Nov 2004
Location: eating kernel
Status: Offline
Reply With Quote
Apr 7, 2007, 06:19 PM
 
I'm pretty sure you won't have a problem with it, I heard of somebody doing the same and he didn't notice much lag
Signature depreciated.
     
Posting Junkie
Join Date: Jan 2006
Location: Seattle, Washington
Status: Offline
Reply With Quote
Apr 7, 2007, 06:25 PM
 
Yes it makes a difference, and you should go back to 667 MHz. I've mixed 533 MHz with 667 MHz too and that wasn't so good.
     
Senior User
Join Date: Mar 2007
Location: San Jose
Status: Offline
Reply With Quote
Apr 7, 2007, 07:24 PM
 
Could you elaborate on the drawbacks? I've been running with 3GB (2GB 533MHZ that was mislabeled as 667, 1GB 667MHZ) for almost a month now on my MBP C2D, and I haven't noticed anything in particular amiss.
     
Moderator
Join Date: Oct 2002
Status: Offline
Reply With Quote
Apr 8, 2007, 07:07 AM
 
draw back is speed. The bus is rated for 667 and the CPU uses that to calculate a certain multuplier for clock speed. Slower RAM, means everything else has to clock down to match it. Basically, you could be running at only 80% CPU speed.
     
Senior User
Join Date: Mar 2007
Location: San Jose
Status: Offline
Reply With Quote
Apr 8, 2007, 07:54 AM
 
That's not really true though. Unless all your application is doing is reading and writing to memory, the handicap will be far less than 20%. Moreover, I'm running Core2DuoTemp, and my CPU clock is still reported at 2.16GHZ. As for the whacked CPU/Bus ratio, once again, if the original machine is running with a 3.25:1 multiplier, how is running at 4.05:1 such a tragedy?
     
Moderator
Join Date: Oct 2002
Status: Offline
Reply With Quote
Apr 8, 2007, 08:24 AM
 
Then keep your configuration. Don't change it. No one told you to. You asked what the drawbacks are.

The truth is... speed. Will you notice this in the real world? Probably not. As you haven 't. But that doesn't mean it isn't happening. Bottom line... you're the only one it affects. And if you don't care, leave it.
     
Senior User
Join Date: Mar 2007
Location: San Jose
Status: Offline
Reply With Quote
Apr 8, 2007, 08:28 AM
 
I was curious as to the specific drawbacks. A 20% across-the-board drop in speed would be quite noticeable, IMO. My guess is that for non-synthetic tests, you'd be hard-pressed to see more than a 5% difference, but if you've got examples, I'd be interested in hearing them.
     
Fresh-Faced Recruit
Join Date: Mar 2007
Location: SoCal
Status: Offline
Reply With Quote
Apr 8, 2007, 03:25 PM
 
Contrary to what chipchen posted, it DOES NOT slow down your CPU. The CPU frequecy remains the same; it's just memory access that is degraded. On the other hand, I tried this just for fun, and what I found was that mixing 533 and 667 RAM resulted in a noticeable increase in the fequency of kernel panics (what I like to call "Black Multi-lingual Screens of Death, BMSD). Increase, as in, before the RAM I might get one every few months if I installed a bad driver...to happening once every day or to with mixed RAM. This was with Crucial RAM, both from the same chip manufacturer...so quality RAM. The MacBook Pro I tried it in sure didn't like the mix..
     
Junior Member
Join Date: Feb 2005
Status: Offline
Reply With Quote
Apr 9, 2007, 10:51 AM
 
Keep in mind also that on the Macbook, video speed is dependent on RAM speed. So, if you do even mild gaming on the Macbook, you'll be better off with 667.
     
Senior User
Join Date: Nov 2005
Status: Offline
Reply With Quote
Apr 10, 2007, 10:54 PM
 
OT: Got a link to Core2DuoTemp? I tried Google but found references to it in forum posts but no software.
     
Dedicated MacNNer
Join Date: Apr 2003
Location: Leawood, KS
Status: Offline
Reply With Quote
Apr 10, 2007, 11:20 PM
 
Wow, thanks for the replies everyone! I ended up selling the memory chips and going to get the correct memory. Do you all recommend Crucial memory or will brands like these work well too?

Newegg.com - mushkin 2GB (2 x 1GB) 200-Pin DDR2 SO-DIMM DDR2 667 (PC2 5300) Dual Channel Kit Notebook Memory - Retail

Newegg.com - G.SKILL 2GB (2 x 1GB) 200-Pin DDR2 SO-DIMM DDR2 667 (PC2 5300) Dual Channel Kit Notebook Memory - Retail

2GB kit (1GBx2), 200-pin SODIMM, DDR2 PC2-5300 upgrades for Apple MacBook 2.0GHz Intel Core 2 Duo (13-inch White) Laptop/Notebook, CT613250 from Crucial.com

Of these 3, which one will you all recommend?
Thanks for the help everyone!!
15" PowerBook 1.5GHz (CTO): SuperDrive, 5400rpm 80GB 16mb Cache, 1.5GB RAM/Backlit Keyboard/Radeon 9700 128MB/MacOS X 10.4.2
     
Senior User
Join Date: Mar 2007
Location: San Jose
Status: Offline
Reply With Quote
Apr 11, 2007, 07:47 AM
 
Get the Mushkin or the Crucial. Crucial has the better reputation, but they're both good vendors. I'd stay away from G.Skill: as mentioned above, the mislabeled their DDR2 533 2GB sticks as DDR2 667. Not cool, and they're not even that much cheaper.
     
Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
Status: Offline
Reply With Quote
Apr 11, 2007, 01:36 PM
 
Crucial.

I'd take Crucial even if it was a bit more expensive than mushkin.
     
   
Thread Tools
Forum Links
Forum Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On
Top
Privacy Policy
All times are GMT -4. The time now is 01:43 PM.
All contents of these forums © 1995-2014 MacNN. All rights reserved.
Branding + Design: www.gesamtbild.com
vBulletin v.3.8.8 © 2000-2014, Jelsoft Enterprises Ltd., Content Relevant URLs by vBSEO 3.3.2