Motu 324pci Vs. 424pci Vs. Firwire., stutering and latency Options

[hani]

im currently using :

mac g4 1.3 ghz osx 10.3.9
motu pci 324 w/ 1224 IO.
cubase 2.2sx.

i have set my buffer very high (1024 samples). and still getting stutering .
and cant play any vstI synths in real time due to very bad latency .

i cant set the buffer any lower because the stutering will increase .

should i switch to Motu pci 424 or firewire? or switch brands .. will the latency & stutering issues improve?

any cubase users out ther? what do you reccomend? what are you using?
i dont need much!! just the basic 8 out/in digital I/O and if midi is included that would be cool too.

please help.

[hani]

i got 1 gig ram.

the cpu meter is not behaving like you described.

the anoying part, is the high buffer size that i'm forced to used to avoid further audio stutering and glitching.

for example. a simple project with no VSTI used. 24trks audio.
at a buffer size 512 samples. the audio will stuter every 5 secs.
the only setting that causes the minimal amount of audio interuption or glitching is 1024 samples.. due to the high latency at 25. 465 ms , i cant play any vsti in real time.