error 6101 / 9128 CPU overload MAC PPC G5

[johnsongs74]

Having trouble with error codes 6101/9128. CPU overload, remove some plugins e.t.c. Only happens with higher track count, I open a song with 4-5 tracks and a few plugins and seems fine but with larger track counts ( say 10-15) is when it starts playing up. CPU usage is only around 40% at most. tried all the optimizations recommended through Avid, to the best of my knowledge, reinstalled protools, updated drivers for profire still to no avail. Any help would be greatly appreciated. Specs below.

Protools M Powered 8.1

Profire 2626

Power Mac G5 OSX 10.5.8 Leopard
Model Identifier: PowerMac7,3
Processor Name: PowerPC G5 (2.2)
Processor Speed: 2 GHz
Number Of CPUs: 2
L2 Cache (per CPU): 512 KB
Memory: 8 GB
Bus Speed: 1 GHz

FireWire Bus:

Maximum Speed: Up to 800 Mb/sec

ProFire 2626:

Manufacturer: M-Audio
Model: 0x10
GUID: 0xD6C0404000002
Maximum Speed: Up to 400 Mb/sec
Connection Speed: Up to 400 Mb/sec
Sub-units:
ProFire 2626 Unit:
Unit Software Version: 0x100C1
Unit Spec ID: 0xD6C

Serial-ATA Bus:

Maxtor 6Y250M0:

Capacity: 233.76 GB
Model: Maxtor 6Y250M0
Revision: YAR51FW0
Serial Number: Y61A2Y9E
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Protocol: ata
Unit Number: 0
Socket Type: Serial-ATA
Bay Name: "A (upper)"
Mac OS 9 Drivers: No
Partition Map Type: APM (Apple Partition Map)
S.M.A.R.T. status: Verified
Volumes:
OSX:
Capacity: 233.64 GB
Available: 195.63 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk1s3
Mount Point: /

Serial Number: Y61A2Y9E
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Protocol: ata
Unit Number: 0
Socket Type: Serial-ATA
Bay Name: "A (upper)"
Mac OS 9 Drivers: No
Partition Map Type: APM (Apple Partition Map)
S.M.A.R.T. status: Verified
Volumes:
OSX:
Capacity: 233.64 GB
Available: 195.63 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk1s3
Mount Point: /

SECOND HARD DRIVE

Serial-ATA Bus:

ST31000340AS:

Capacity: 931.51 GB
Model: ST31000340AS
Revision: SD25
Serial Number: 9QJ3SBX1
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Protocol: ata
Unit Number: 0
Socket Type: Serial-ATA
Bay Name: "B (lower)"
Mac OS 9 Drivers: No
Partition Map Type: APM (Apple Partition Map)
S.M.A.R.T. status: Verified
Volumes:
Protools:
Capacity: 931.39 GB
Available: 924.74 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk0s3
Mount Point: /Volumes/Protools

GRAPHICS/DISPLAYS

GeForce FX 5200:

Chipset Model: GeForce FX 5200
Type: Display
Bus: AGP
Slot: SLOT-1
VRAM (Total): 64 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0321
Revision ID: 0x00a2
ROM Revision: 2060
Displays:
Acer X193HQV:
Resolution: 1366 x 768 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
X193HQ:
Resolution: 1366 x 768 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Mirror: Off
Online: Yes
Quartz Extreme: Supported

MEMORY

DIMM0/J11:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown

DIMM1/J12:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown

DIMM2/J13:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown

DIMM3/J14:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown

DIMM4/J41:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown

DIMM5/J42:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown

DIMM6/J43:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown

DIMM7/J44:

Size: 1 GB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
Manufacturer: Unknown
Part Number: Unknown
Serial Number: Unknown