Poor Rendering CPU utilization

Hi,
I just got my brand-new PC including a Intel Core i7 920 and ASUS P6T Deluxe V2 Motherboard running on Windos 7 RC. I created a demo project and exported a sequence to 1920i m2v format. I was very disappointed that the CPU utilization during the rendering process was only 20-25%. Same with rendering for preview within premiere itself. Is there any way to improve this?
- Stefan

Could there be a mistake somewhere? I ran the Sandra benchmark on physical disks and got these results:
With 6.00 ms access time your access time would be the same as a 15K SCSI-3 disk.
All the SATA disks, including my Areca raid show access times around 13 to 16 ms.
BTW, Sandra gave my raid a drive index of 1479 MB/s. It shows that interpreting these results from different benchmarks it a difficult job. The results vary so much between programs. For instance:
SANDRA:      1479 MB/s, but indicates the size correctly as 10 TB
HD Tune Pro:   745 MB/s, but indicates the size INcorrectly as 2199 GB
HD Tach:         802 MB/s
all on the same raid array. The same applies to access times, with Sandra 13.2 ms, with HD Tune Pro 9.1 ms. All my single SATA disks show around 13.5 ms access time in HD Tune Pro. The drive index for single disks do not vary as much, both Sandra and HD Tune Pro show around 91 MB/s.
From what I have seen it looks like HD Tune Pro is the most representative benchmark for disk performance, more so than Sandra.

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