800 MHz RAM in new MacBook Pro?

ravenvii

macrumors 604

Original poster

Mar 17, 2004

7,585

494

Melenkurion Skyweir

• Jun 6, 2007

• #1

I know they come with 667 MHz RAM. But if you get, and subsequently stick in, 800 MHz RAM, will it run at 800 MHz, or be throttled back to 667 MHz?

 

Vidd

macrumors 65816

Mar 7, 2006

1,001

108

• Jun 6, 2007

• #2

Someone has said here that it's a limitation in the Santa Rosa chipset and so it's limited to DDR2 speeds.
Not sure if it's true, though.

 

Airforce

macrumors 6502a

Jan 12, 2006

933

0

• Jun 6, 2007

• #3

ravenvii said:

I know they come with 667 MHz RAM. But if you get, and subsequently stick in, 800 MHz RAM, will it run at 800 MHz, or be throttled back to 667 MHz?

Click to expand...

It will be throttled back to 667mhz.

 

Eraserhead

macrumors G4

Nov 3, 2005

10,434

12,250

UK

• Jun 6, 2007

• #4

That's a good question, I'm sure a tech website will try it out soon enough.

 

Airforce

macrumors 6502a

Jan 12, 2006

933

0

• Jun 6, 2007

• #5

Eraserhead said:

That's a good question, I'm sure a tech website will try it out soon enough.

Click to expand...

airforce said:

It will be throttled back to 667mhz.

Click to expand...

 

Cabbit

macrumors 68020

Jan 30, 2006

2,128

1

Scotland

• Jun 6, 2007

• #6

Airforce said:

Click to expand...

so-dimm ddr2 will work at 800 MHz, the only problem is there is none

 

Eraserhead

macrumors G4

Nov 3, 2005

10,434

12,250

UK

• Jun 6, 2007

• #7

Airforce said:

It will be throttled back to 667mhz.

Click to expand...

But why? The chipset is 800Mhz.

 

GroundLoop

macrumors 68000

Mar 21, 2003

1,586

62

• Jun 6, 2007

• #8

Eraserhead said:

But why? The chipset is 800Mhz.

Click to expand...

The front side bus is 800MHz. The memory controller only supports up to 667Mhz.

Hickman

 

Eraserhead

macrumors G4

Nov 3, 2005

10,434

12,250

UK

• Jun 6, 2007

• #9

Brian Hickman said:

The front side bus is 800MHz. The memory controller only supports up to 667Mhz.

Hickman

Click to expand...

I thought it might just be Apple being cheap with their RAM, but that makes sense.

 

A

aliquis-

macrumors 6502a

May 20, 2007

680

0

• Jun 6, 2007

• #10

Eraserhead said:

But why? The chipset is 800Mhz.

Click to expand...

CPU FSB is 800MHz but chipset specs says 667MHz DDR2 for memory.

 

M

mmccaskill

macrumors 6502

Jan 3, 2007

349

0

• Jun 6, 2007

• #11

But its dual channel still. So maybe it isn't that bad?

 

D

dooyou

macrumors 6502

Jun 5, 2007

374

277

Munich

• Jun 6, 2007

• #12

 

ravenvii

macrumors 604

Original poster

Mar 17, 2004

7,585

494

Melenkurion Skyweir

• Jun 6, 2007

• #13

Well, there you go.

Thanks guys. Guess I can get rid of RAM upgrades from my budgeting. 2 GB is plenty for me for the time being.