PDA

View Full Version : Interesting eMac fact....




WGoins88
Nov 11, 2011, 07:50 AM
Interesting. My 1.42GHz eMac recognizes PC3200 memory as PC3200 memory, not PC2700, like most G4 Macs do. Odd.



adcx64
Nov 11, 2011, 08:02 AM
But it will only run at PC2700 speed.:)

WGoins88
Nov 11, 2011, 09:12 AM
Ran some Geekbench tests...

Just the 512 PC2700 module - 780
Memory performance - 555
Memory bandwidth - 320

Just the 512 PC3200 module - 785
Memory performance - 561
Memory bandwith - 325

Both Modules installed (1GB) - 798
Memory performance - 580
Memory bandwidth - 355

Even though the 3200 module runs at 2700, the results are interesting nonetheless, considering both modules are Nanya brand, 2.5 latency and same clock timings, just different speeds.

hansolo669
Nov 12, 2011, 09:06 PM
Ran some Geekbench tests...

Just the 512 PC2700 module - 780
Memory performance - 555
Memory bandwidth - 320

Just the 512 PC3200 module - 785
Memory performance - 561
Memory bandwith - 325

Both Modules installed (1GB) - 798
Memory performance - 580
Memory bandwidth - 355

Even though the 3200 module runs at 2700, the results are interesting nonetheless, considering both modules are Nanya brand, 2.5 latency and same clock timings, just different speeds.

considering that the 3200 would be timed and set for a 3200 buss you can assume that with the left over speed it could run the 2700 buss right to its max, at least, in theroy (and so it seams irl).

adcx64
Nov 13, 2011, 11:02 AM
considering that the 3200 would be timed and set for a 3200 buss you can assume that with the left over speed it could run the 2700 buss right to its max, at least, in theroy (and so it seams irl).

PC2700 should run at its max as well. There's no need for the extra speed as the computer cannot utilize it.

zen.state
Nov 13, 2011, 12:23 PM
The only actual advantage to using faster rated but still compatible memory is that you then have it if you ever get a Mac in the future that would use the speed it's actually capable of. In terms of performance it won't help at all to use 3200 in a 2700 slot. Those very slight increases you see could only be from the timing. Timing is the only way you can make your memory faster.

At OWC for example with many different Macs they offer slower timed memory for less than the highest performance options. The differences are so minimal that it's not really worth bothering.

adcx64
Nov 13, 2011, 12:28 PM
Exactly, faster timed RAM only shows the difference in milliseconds, which really cannot be distinguished when you use the computer.