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121

macrumors newbie
Original poster
Jul 21, 2008
3
0
Hi
I just bought a Mac Pro. It only has 4GB installed on it. I was going to upgrade ram but i came across a problem.

The pre-installed ram is 4x1GB 667 ECC DDR2 FB DIMM according to system profiler. I said to myself fine, this is 667 mhz ram but while looking at the serial of my mac i saw it was an early 2008 (april) Mac Pro 3.1
and those machines need 800 mhz according to various sources. System profiler also says this is a Mac Pro 3.1
It would be a sure bet to get 667 mhz ram but I'd like to get 800 mhz for better performances. SO what shall I get ?

Thanks
 

121

macrumors newbie
Original poster
Jul 21, 2008
3
0
ok thanks!
How is it possible that the Mac Pro is running 667mhz ram right now?
 

121

macrumors newbie
Original poster
Jul 21, 2008
3
0
all right thanks! just got 16GB 800mhz for 388 shipped.
 

Spacedust

macrumors 6502a
May 24, 2009
999
160
Hynix, Micron works are the best.

One of my Micron sticks died few months ago and I replaced it work Hynix. All working fine ;)

Samsung is ok too, only Qimonda didn't worked properly.
 

mongeta

macrumors newbie
Sep 18, 2011
22
0
What happens if you mix differents speeds?

A friend of mine has a MacPro '08 with 2gb at 667 and wants to add more ram, the 667 is cheaper than the 800, but slower...

If you mix it all 800 goes down to 667 ?

Just curious...

thanks,
 

Umbongo

macrumors 601
Sep 14, 2006
4,934
55
England
What happens if you mix differents speeds?

A friend of mine has a MacPro '08 with 2gb at 667 and wants to add more ram, the 667 is cheaper than the 800, but slower...

If you mix it all 800 goes down to 667 ?

Just curious...

thanks,


If it works (should do) it'll go down to 667.
 

nanofrog

macrumors G4
May 6, 2008
11,719
3
Ok, thanks, so it's better to buy ram for the current module's speed, in this case 667
Under the given conditions (mixed frequencies after the upgrade and the 667MHz is cheaper), then 667MHz is the more cost effective way to go. :)
 
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