Otto_M said:Hi,
I have an Imac G5 with one original Apple 512mb memory stick. I was wondering if I buy another 512mb stick from Crucial or Kingston, do I get 128bit memory bus?
cluthz said:There is no whatsoever preformance gain in having a 128-bit bus vs a 64-bit bus on the iMac.
I thougth at first it would be an advantage, and I also ordered my iMac with two matching 512mb sticks.
Take a look here and see for yourself:http://www.barefeats.com/imacg5d.html
Le Big Mac said:Maybe I'm misunderstanding, but that looks to be answering a different questions, which is: are you better off with 2 512mb chips or one 1GB chip, and other permutations of one large vs. two smaller chips, or two chips of different sizes.
We're trying to answer the question of whether, if you will have two 512mb chips, it's better to have them identical in certain respects so that you can take full advantage of the 128-bit bus.
Le Big Mac said:...We're trying to answer the question of whether, if you will have two 512mb chips, it's better to have them identical in certain respects so that you can take full advantage of the 128-bit bus.
Dual 512MB Single 1GB Gain/(Loss)
Photoshop MP 58 sec 58 sec 0%
Photoshop SP 78 sec 80 sec 2.5%
AppleWorks 11.9 sec 11.2 sec (-5.9%)
(f/r, spell, scroll)
Motion Render 4 fps 4 fps 0%
iMovie Render 78 sec 78 sec 0%
iTunes Rip 100 sec 99 sec (-1%)
Halo Timedemo 42.8 fps 41.4 fps 3.3%
UT2k4 Botmatch 33.4 fps 32.9 fps 1.4%
AVERAGE GAIN 0%
cluthz said:IAs you see, no gain at all for mached pairs...
Yes, the 512mb WAS mached pairs @ 128bit
Le Big Mac said:Understood, but the question is what about unmatched pairs.
The problem is that apple will ship with some amount of memory, so the question is how most economically to upgrade that memory. Some people don't want to buy and sell chips, they just want to buy and be done.