Merlijn53
Established
At work, I still using an older "late 2009" MacPro (dual Xenon w/ 12gig RAM). It ran 10.6.8 when I started working there and has since been upgraded to 10.8.x. Some of the external drives are SCSI 800 and our Imacon 848 is SCSI. All worked fine under 10.6.x and still work fine under 10.8.x. Admittedly this old beast isn't quite as fast as my personal off-the-shelf 2013 vintage Dell XPS8700 (quad cord I7 w/ 8gig RAM) when working with larger Ps files (large=600mb+). The old hard drive as lethargic by today's standards and are the main bottleneck.
We'll likely replace the MacPro in the not too distant future and the replacement is likely be a top model iMac stuffed with at least 32gb RAM and a new Thunderbolt external drive or drive array. Our off-site backup drives are USB3, which a new iMac can make good use of but the old MacPro requires that they fall back to USB2 speeds making a full backup take some 30+ hours (3 nights).
The budget restricted user should seriously consider using Windows. Mac's are great, but the cost more for the same quality and performance.
Afaik, there is no scsi 800. I suppose you mean firewire 800.
The 848 has scsi and firewire, so that's no problem with a new computer/system.
Frank