[quote name='Vinny']If you want to increase speeds, you need to reduce the load on the IDEs. An IDE can support two devices but it can actually only transfer data to a single device at a time.
If you want to see a noticeable upgrade, you'd have to dedicate each device to it's own port (meaning each device gets its own IDE/SATA port). That means you'd have to get a new mobo or get a PCI IDE card to support all your burners and HDs. But a CPU upgrade shouldn't do much for you.
A Core 2 Duo would help if you for encoding. Encoding (especially video encoding) is heavily dependent on the processor and ram.
Seriously though, why do you have 4 burners and need to burn/rip so much stuff? Are you running a bootlegging operation?
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This would be true for older equipment but modern ATA100/133 and the chipsets that support it have far more bandwidth than any two DVD burners together can use up. The latest 20x DVd burners (just got one yesterday for a new Vista box) will at best run through 24 MB a second, assuming everything else involved is supporting this. Try finding 20x media or even reliable 18x media for those drives that are a couple months older.
So altogether, the two drives will create a load of less than 50 MB and considerably less if they're doing identical burns with smart software. That is far short of overwhelming ATA100. The only case where you'll really see the peak IDE bus performance used is for 4 or more striped drives in a RAID. No individual device had the kind of throughput needed to push the limits before SATA became the standard. SATA optical drives are now available but at a steep premium. By the time optical drive get fast enough to really need SATA, if ever, they'll be at the low end of SATA performance just as they trailed hard drives on older bus types.