1x DVD-ROM drives provide a data transfer rate of 1.321 MB/s (11.08*10^6/8/2^20) with burst transfer rates of up to 12 MB/s or higher. The data transfer rate from a DVD-ROM disc at 1x speed is roughly equivalent to a 9x CD-ROM drive (1x CD-ROM data transfer rate is 150 KB/s, or 0.146 MB/s). DVD physical spin rate is about 3 times faster than CD (that is, 1x DVD spin ~ 3x CD spin)

So if you are using your DVD rom as Cdrom as well for standard use then faster is always better.

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Intel® Pentium® III Processor at 1GHz
256MB Crucial SDRAM at 133MHz CAS 2
Iwill Side Raid 66
2 x 15 Gig Maxtor (5400 RPM) Drives (RAID 0)
12x DVD-Rom
4x/2x/24x HP 8100i CD-RW
Dell E770 Monitor 17" (16.00 "vis)
64MB NVIDIA GeForce2 Ultra GTS w/ DVI
Guillemot Fortissimo Sound

"The Razzer"
Intel® Pentium® II Processor at 350 MHz
96MB Generic SDRAM at 100MHz
10 Gig Fujitsu (or however it's spelled)(5400 RPM) Drive
16MB Creative 3DFX Voodoo Banshee
Built in Sound on the SiS Board