I’ve done some tests with an Ultra 66 Card under Windows 2000 Advanced Server, look what I sent to Promise. Have you got a working setup with this card? What is your CPU utilization when you are WRITING to a CDRW via this card? (the system part of it, at least).
What driver versions have you used under win2k?
If you use a Promise controller for your CDRW, and it runs smoothly, please let me know the model and your max achieved writing speed and CPU utilization.
Please proceed to read my post to Promise, right below…
I’ve used an Ultra 66 card for connecting a couple of CDRWs to my system. I use Windows 2000 Advanced Server. Unfortunately, the drivers that are on your webpage do not seem to work with windows 2000 if someone selects the promise ultra66 card (windows complains this driver is not designed for windows 2000 and aborts installation). This is some thing you could fix, since I suspect it is in the *.INF file.
From the same driver pack, I’ve installed the card as Ultra100 (which installs exactly the same files), and of course the card worked at once. To my surprise, support for ATAPI devices is NOT good. When it comes to writing, the driver of the card yields a very high load to the system, from 40 to 80% on a PIII@1000MHz. This sounds like there is no busmastering for writes (although reads are OK).
Both CDRWs are set at UDMA2 (33MB/sec). Running some benchmarks on the controller bandwidth, I’ve experienced a very low bandwidth available to the drives, a mere 11MB/sec. Even my old VIA 694X motherboard can provide 18MB/sec to the drives, so I think the ATAPI layer in this controller is terribly bad.
So, to get me out of this pit, you may help me by providing me a fixed version of drivers that work in win2k advanced server and of course do not impose that unacceptable penalty during writes to ATAPI devices. Do the later controllers of yours (Ultra100 or Ultra133) have the same problems with ATAPI devices?
The Ultra66 controller runs on a Asus P3V4X motherboard, that has a VIA 694X chipset. RAM is 640MB, CDRWs are of type Sony 195E, each occupying its own channel on the controller. The processor of the system is an Intel PIII@1000 MHz.
I’ll be expecting your reply.