800mhz ram for Macbook pro 2.4ghz?

koops

macrumors regular
Jun 18, 2007
169
0
London
Howdy folks, just a query - is it worth buying (and is it supported?) 800mhz DDR2 PC2-6400 ram for my new Macbook pro 2.4ghz?

http://www.crucial.com/uk/store/partspecs.aspx?imodule=CT2KIT25664AA80E

I'm getting some financial help from work so want to buy the best ram possible

apologies if I'm being idiotic - I'm not too tech

cheers!
Ben
I think form reading other posts, the memory controller is 667Mhz on the board, so you can buy 800Mhz RAM but it would only run at 667Mhz and wouldn't show any benefit.
 

benjamin77

macrumors newbie
Original poster
Jul 11, 2007
4
0
amsterdam expat
I think form reading other posts, the memory controller is 667Mhz on the board, so you can buy 800Mhz RAM but it would only run at 667Mhz and wouldn't show any benefit.
thanks! I thought because the santa rosa bus speed is 800mhz is would support the ram...
 

diadem

macrumors regular
Nov 13, 2006
139
0
Glasgow
It will use the full 800Mhz speed, But i wouldnt bother it uses alot of power would stick with 667Mhz ram for battery life the difrence is small anyway.
 

WorldIRC

macrumors 6502
Sep 25, 2005
393
5
^How would it use the 800mhz....the memory controller only supports 667mhz ram sticks...
 

Cali_Man

macrumors member
Apr 5, 2005
44
0
Amsterdam, The Netherlands
Howdy folks, just a query - is it worth buying (and is it supported?) 800mhz DDR2 PC2-6400 ram for my new Macbook pro 2.4ghz?

http://www.crucial.com/uk/store/partspecs.aspx?imodule=CT2KIT25664AA80E

I'm getting some financial help from work so want to buy the best ram possible

apologies if I'm being idiotic - I'm not too tech

cheers!
Ben
I think it's not supported. Weird, I'm a Ben who will also soon be an expat living in Amsterdam, and will most likely be showing up with the same machine haha.
 

Zel

macrumors regular
Jul 7, 2007
172
0
Anyone know what's the point of an 800mhz frontside bus couples with a 666mhz memory controller?

it doesnt make any sense... where is that 800mhz relevant to???
 

tejota1911

macrumors 6502
Nov 10, 2006
283
33
If your work is paying for it, buy the 800Mhz RAM. Your current MBP will only run it at 667Mhz, but in a future revision 800Mhz RAM may be supported. You could potentially use it at full speed in your next computer(MBP, MB, iMac, etc.). If it's on your dime, just get the 667Mhz RAM.
 

krystox

macrumors newbie
Jun 11, 2007
6
0
Does anyone know if the new firmware would support 800Mhz memory or not. I feel it's probably just a software lock. I was told some dell SR laptops supports PC2-6400 right?
 

Sbrocket

macrumors 65816
Jun 3, 2007
1,251
0
/dev/null
Does anyone know if the new firmware would support 800Mhz memory or not. I feel it's probably just a software lock. I was told some dell SR laptops supports PC2-6400 right?
Its not a software lock imposed by Apple or otherwise. The memory controller in the current revision SR MacBook Pros does not support PC2-6400 RAM at its full speed...only 667MHz. The Santa Rosa platform doesn't include a memory controller that supports 800MHz RAM at its full speeds, so while you can definitely use it...you're not going to get any benefit from it.

It comes down to the memory controller used on the specific computer. I have no idea if some Dell Santa Rosa-based laptop has a different component than the MBP, so I'm not going to make any claims about that...but the SR MBPs don't support 800MHz RAM right now.
 

joehack

macrumors member
May 29, 2006
69
0
Zurich
Anyone know what's the point of an 800mhz frontside bus couples with a 666mhz memory controller?

it doesnt make any sense... where is that 800mhz relevant to???
There are 2 things:

1. It's a dual channel memory controller. Hence 667MHz * 2.
2. The CPU talks to a lot of other components. Hence, the overall throughput grows.

Jochen
 

denbysweeting

macrumors newbie
Jan 23, 2013
2
0
Anyone know what's the point of an 800mhz frontside bus couples with a 666mhz memory controller?

it doesnt make any sense... where is that 800mhz relevant to???
Sorry to nitpick but it's 667Mhz, and not 666Mhz. The Santa Rosa spec allows for true 64-bit computing, previous chipsets didn't. I guess the 667MHz bottle neck is an example of staggered tech release...? (By Intel, not Apple.)
 

snaky69

macrumors 603
Mar 14, 2008
5,904
481
Sorry to nitpick but it's 667Mhz, and not 666Mhz. The Santa Rosa spec allows for true 64-bit computing, previous chipsets didn't. I guess the 667MHz bottle neck is an example of staggered tech release...? (By Intel, not Apple.)
Holy necro-bump from 6 years ago!
 

denbysweeting

macrumors newbie
Jan 23, 2013
2
0
Sorry to nitpick but it's 667Mhz, and not 666Mhz. The Santa Rosa spec allows for true 64-bit computing, previous chipsets didn't. I guess the 667MHz bottle neck is an example of staggered tech release...? (By Intel, not Apple.)
Sorry, my mistake. That was Core to Core 2... I'll go away now,