BenQ DW1640 Device Buffer

[Hollow Oddities]

I bought a BenQ DW1640 and I can't reach stable recording speeds.

With DVD Decrypter, the Device Buffer goes from 85% to 90% all the time and never reach 100%. The recording speed, when I set 4x sometimes goes to 3.3x, 3.6x, etc. When I set 8x it goes to 6.0x, 6.6x, 7.4x, 8.0x, etc. never 8x stable.

The Media I'm using is Verbatim MCC 02RG20 and Ridata Ritek G05.

Here's a Log.

I 20:15:59 DVD Decrypter Version 3.5.4.0 started!
I 20:15:59 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 2)
I 20:15:59 Initialising SPTI...
I 20:15:59 Searching for SCSI / ATAPI devices...
I 20:15:59 Found 1 DVD-ROM, 1 DVD±RW and 1 DVD-RAM/±RW!
I 20:16:14 Operation Started!
I 20:16:14 Source File: C:\Advent Children.ISO
I 20:16:14 Source File Sectors: 2,032,704 (MODE1/2048)
I 20:16:14 Source File Size: 4,162,977,792 bytes
I 20:16:14 Source File Application Identifier: NERO BURNING ROM
I 20:16:14 Source File Implementation Identifier: Nero
I 20:16:14 Destination Device: [1:2:0] BENQ DVD DD DW1640 BSHB (D (ATA)
I 20:16:14 Destination Media Type: DVD-R (Disc ID: MCC 02RG20) (Speeds: 2.4x, 4x, 8x)
I 20:16:14 Destination Media Sectors: 2,298,496
I 20:16:14 Write Mode: DVD
I 20:16:14 Write Type: SAO
I 20:16:14 Write Speed: 4x
I 20:16:14 Link Size: Auto
I 20:16:14 Test Mode: No
I 20:16:14 BURN-Proof: Enabled
I 20:16:15 Filling Buffer...
I 20:16:25 Writing LeadIn...
I 20:16:40 Writing Image...
I 20:29:50 Synchronising Cache...
I 20:30:34 Operation Successfully Completed! - Duration: 00:14:16
I 20:30:34 Average Write Rate: 5,152 KB/s (3.7x) - Maximum Write Rate: 5,565 KB/s (4.0x)

Is something wrong? Is this a common thing among BenQ writers?
With my old LG4163B I always got stable speeds at 4x and 8x.

The device is set as Master in the Secondary IDE Channel with no Slave attached, ATA33.

My system is:
A64 3000+ NewCastle
DFI LanParty UT nF3250Gb
Coolmax 400W PSU
512mb SuperTalent CL2
WinXP SP2

[budz]

My 1640 does the same with the buffer going from 85-90 when using DVD DECRYPTER. I have no problems with discs playing back correctly when I burn with my 1640. As for the stable speeds I've noticed them as well but as I mentioned the discs playback fine which is all that matters to me. If you want more of a definite answer regarding the BENQ 1640 check out the BENQ FORUM at Cdfreaks.com.
http://club.cdfreaks.com/forumdisplay.php?f=92

Members at the BENQ FORUM are friendly and will try to assist you with your questions.