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urgnt mac pro memory problem

dudeofblokes

dudeofblokes

macrumors regular
Original poster
Nov 3, 2007
238
15
carrickfergus, northern ireland, united kingdom
a few days ago i asked about wether 667mhz mac pro ram will run in a octo mac pro which already had 2gb of 800mhz(2x1gb) ram i was told yes bt all the ram would run at 667mhz i bought 2 x 1gb sticks and 2x 512 and installed them with the 2gb i already had meaning id have 5gb but thats not happened, the 2 new sticks of 1gb dont get reconised and the original 2gb sticks are each reading 512 instead of 1gb.

so now i should have 3gb but the machine is claiming all four sticks are 512 but thats not true 2 of the sticks are actually 1gb.

they are all paired the way they supposed to be so i dont know whats going on
 
dudeofblokes said:
a few days ago i asked about wether 667mhz mac pro ram will run in a octo mac pro which already had 2gb of 800mhz(2x1gb) ram i was told yes bt all the ram would run at 667mhz i bought 2 x 1gb sticks and 2x 512 and installed them with the 2gb i already had meaning id have 5gb but thats not happened, the 2 new sticks of 1gb dont get reconised and the original 2gb sticks are each reading 512 instead of 1gb.

so now i should have 3gb but the machine is claiming all four sticks are 512 but thats not true 2 of the sticks are actually 1gb.

they are all paired the way they supposed to be so i dont know whats going on
Click to expand...

I don't know who told you that, but 667MHz stuff won't run in a new Mac Pro with an 800MHz bus.
 
aibo
macrumors member

Join Date: Jan 2008
Location: San Diego
Quote:
Originally Posted by dudeofblokes
can an early 08 octo pro take 667 ram or does it have to be 800mhz i have the chance to get 4gb 667 mac pro ram for £120

yes it works, but causes all your RAM to run at 667MHz
__________________

thats my question and aibo reply
 
krye said:
I don't know who told you that, but 667MHz stuff won't run in a new Mac Pro with an 800MHz bus.
Click to expand...

The 667 will run in the new mac pro. http://www.barefeats.com/harper5.html

ANALYSIS
If you have a big investment in 667MHz memory, you can use those FB-DIMMs with the new Mac Pro. The tests we ran show a maximum penalty of 4% in speed. Considering the advantage over the 3.0GHz 8-core "Cloverfield" Mac Pro ranges from 18% to 24% when running Photoshop, After Effects, and Aperture, you might feel you can live with a 4% hit.
Click to expand...
 
dudeofblokes said:
a few days ago i asked about wether 667mhz mac pro ram will run in a octo mac pro which already had 2gb of 800mhz(2x1gb) ram i was told yes bt all the ram would run at 667mhz i bought 2 x 1gb sticks and 2x 512 and installed them with the 2gb i already had meaning id have 5gb but thats not happened, the 2 new sticks of 1gb dont get reconised and the original 2gb sticks are each reading 512 instead of 1gb.

so now i should have 3gb but the machine is claiming all four sticks are 512 but thats not true 2 of the sticks are actually 1gb.

they are all paired the way they supposed to be so i dont know whats going on
Click to expand...

Exactly how do you have them installed?
 
they were arranged in the pairing order on each slot they all worked seperately but together they didnt reconnise each other or when they did it was the wrong values, im just going to auction the 667 memorys of and add the rest to get some true 800 ram, thanks anyway everyone
 
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