Is it worth upgradeing 8gb 1066ghz RAM to 8gb 1333ghz?

[SPNarwhal]

I know that if you have both mixed and matched in there then it will just be 1066 since the 1333 with degrade itself to match, but I'm in a position right now where I have 2 x 2gb 1333ghz ram sticks, and I need 2 x 2gb 1066ghz for my Macbook Pro, but the thing is, I have 4 x 2gb 1066ghz of ram in my iMac as it is.

So I have two options.

Buy 4gb of 1066ghz and put it straight into my macbook and still have the spare 1333ghz in my closet,

or buy another 4gb of 1333ghz Ram, install all of it into my ram and take all the 1066ghz out (so ALL of the ram in the iMac will be 1333)
and then use 4gb of the ram that was in my iMac and put that in my Macbook Pro, and then have a spare 4gb of 1066 ram left over.

Either way would be the same price for me, and I know ultimately it would be more beneficial to upgrade the iMac. But is there really a difference? Would it be noticeable?

I'm wanting to know if it's even worth the work to do that or if there won't be any change.

Thanks

 

[ThemacNub]

I wouldn't bother the difference in speed would be negligible

 

[err404]

If your iMac shipped with 1066, the bus may not support 1333 at full speed. In the end you may still be running the at 1066 even if you upgrade the RAM.

 

[toxic]

the difference is negligible. just buy whatever's cheapest...from my experience, 1333 is cheaper anyway.

 

[aliensporebomb]

Depends...

Depends on when your Mac was made.

My late 2009 iMac was shipped with 1066 Mhz memory.

I believe Apple did this because it was far cheaper to source for them.

However, the machine runs 1333 Mhz memory just fine.

The other thing is, the speedup is noticeable in the right applications - benchmarking improved noticeably. Some music apps were more "fleet" feeling and some number crunching applications were happier.

 

[synicalx]

It's the equivalent of taking the spare tire out of the back of your car to make it go faster - you might notice it, but probably won't