I've currently got two Benq drives. One is a DW 1620 and the other is a DW 1650. The 1620 has been working without a problem, but i recently bought a 1650, and for some reason it won't burn at the right speed.
I've tried it with two different motherboard/cpu set ups and it exhibits the same behaviour. I'm currently running an AMD 3800 Dual Core, ASROCK 939SLI32 with 1 GB of RAM.
WHen i burn a DVD, the drive buffer starts otu at around 90 and constantly drops to about 20-30 every few seconds, then returns to the 90 mark. I'm pretty sure this is the reason the burns are taking a lot longer than they should. An 8x burn takes about 16 mins on average.
I've also had the odd coaster every now and then, which i've never experienced on the 1620.
I've checked the DMA, and its on Ultra DMA 2. The drive is also on the Secondary Master channel. The main hard drive is a 200 GB ATA 100 drive.
If anyone can suggest what might be the problem, it would be appreciated. I'm currently using the latest version of Nero 7 on both machines.