I had a similar test and the speed went up when I pulled the RAM back to 2GB. Sorry that may not help but that owner was a little put off by the 4GB issues.
I was testing my performance using PT 6.0 and was wondering why my passmark rating is so low - 450.9 - I was benchmarking it against a similar machine which had an 800 rating and was curious if there is anything I can do to boost performance? Any insight would be appreciated.
Here are my specs:
P4 3.4 Ghz HT
4x 1GB qDi Turbo PC 4200 Ram
Ati x850xt 256mb Vid Card
2x 250GB Western Digital hard drives in a Raid 0 config.
Samsung CD-RW and Samsung DVD-RW DL