Latency problem...

[alfaholic]

First of all, sorry about my broken English...

I have Core2Duo 6850 3ghz, 4 GB RAM, Pro Tools 8 CS2 instaled on Windows XP and OS X Leopard 10.5.5.
On Leopard everything works great, I can put 32 samples latency and my computer still works fine, but on Windows XP I have problem to play virtual instruments with latency less than 256 samples. With 128 samples latency it crackles every 10 seconds, but with 64 samples it crackles every 3 seconds, the same thing is with Nuendo, Cubase, and Kore 2 standalone, or any other standalone VST instrument.

[TOM@METRO]

Tell us about your computer hardware. Post a Sandra report. Start here.

What PT interface are you using?

[alfaholic]

I have Digi Rack 002.

SiSoftware Sandra

System
Host Name : BOJAN
User : Bojan
Workgroup : WORKGROUP

Processor
Model : Intel(R) Core(TM)2 Duo CPU E6750 @ 2.66GHz
Speed : 3.01GHz
Cores per Processor : 2 Unit(s)
Threads per Core : 1 Unit(s)
Type : Dual-Core
Internal Data Cache : 2x 32kB, Synchronous, Write-Thru, 8-way, 64 byte line size
L2 On-board Cache : 4MB, ECC, Synchronous, ATC, 16-way, 64 byte line size, 2 threads sharing

System
System : Gigabyte Technology Co., Ltd. EP35-DS3R
Mainboard : Gigabyte Technology Co., Ltd. EP35-DS3R
Bus(es) : PCI PCIe IMB USB FireWire/1394 i2c/SMBus
Multi-Processor (MP) Support : No
Multi-Processor Advanced PIC (APIC) : Yes
System BIOS : Award Software International, Inc. F2
Total Memory : 3.5GB DIMM DDR2 DDR3

Chipset
Model : Giga-Byte P35/G33/G31 Processor to I/O Controller
Front Side Bus Speed : 4x 376MHz (1.50GHz)
Total Memory : 4GB DIMM DDR2 DDR3
Memory Bus Speed : 2x 451MHz (902MHz)

Memory Module(s)
Memory Module : Kingston KTC1G-UDIMM 1GB DIMM DDR2 PC2-6400U DDR2-800 (5.0-5-5-18 3-23-6-3)
Memory Module : Kingston KTC1G-UDIMM 1GB DIMM DDR2 PC2-6400U DDR2-800 (5.0-5-5-18 3-23-6-3)
Memory Module : Kingston KTC1G-UDIMM 1GB DIMM DDR2 PC2-6400U DDR2-800 (5.0-5-5-18 3-23-6-3)
Memory Module : Kingston KTC1G-UDIMM 1GB DIMM DDR2 PC2-6400U DDR2-800 (5.0-5-5-18 3-23-6-3)

Video System
Adapter : ATI Radeon HD 3600 Series (512MB, PCIe 2.00 x16, PS3.0, VS3.0)

Graphics Processor
Adapter : ATI Radeon HD 26XX (RV630) (1.03, 512MB, 725MHz/252MHz)

Storage Devices
Maxtor 6V200E0 204GB (SATA300, 3.5", 7200rpm, NCQ, 8MB Cache) : 190GB (C:) (F:)
WDC WD3200AAKS-00VYA0 320GB (SATA300, 3.5", 7200rpm, NCQ, 16MB Cache) : 298GB (D:)
WDC WD1600AAJB-00PVA0 160GB (ATA100, 3.5", 7200rpm, 8MB Cache) : 149GB (G:) (H:)
TSSTcorp CDDVDW SH-S223F (SATA150, DVD+-RW, CD-RW, 2MB Cache) : N/A (J:)
STKNEJG 2R89IBO (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R) : N/A (I:)

Logical Storage Devices
Windows (C:) : 50GB (NTFS) @ Maxtor 6V200E0 204GB (SATA300, 3.5", 7200rpm, NCQ, 8MB Cache)
Backup (F:) : 140GB (NTFS) @ Maxtor 6V200E0 204GB (SATA300, 3.5", 7200rpm, NCQ, 8MB Cache)
Hard Drive (D:) : 298GB (NTFS) @ WDC WD3200AAKS-00VYA0 320GB (SATA300, 3.5", 7200rpm, NCQ, 16MB Cache)
Leopard (G:) : 50GB (HFSJ) @ WDC WD1600AAJB-00PVA0 160GB (ATA100, 3.5", 7200rpm, 8MB Cache)
Mac Drive (H:) : 98GB (HFSJ) @ WDC WD1600AAJB-00PVA0 160GB (ATA100, 3.5", 7200rpm, 8MB Cache)
CD-ROM/DVD (J:) : N/A @ TSSTcorp CDDVDW SH-S223F (SATA150, DVD+-RW, CD-RW, 2MB Cache)
CD-ROM/DVD (I:) : N/A @ STKNEJG 2R89IBO (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R)
3.5" 1.44MB (A:) : N/A

Peripherals
LPC Hub Controller 1 : Giga-Byte (ICH9) LPC Interface Controller
Audio Device : Giga-Byte (ICH9) HD Audio Controller
Audio Device : Giga-Byte RV635 Audio device [Radeon HD 3600 Series]
Serial Port(s) : 1
Parallel Port(s) : 1
Disk Controller : Giga-Byte (ICH9) 4 port Serial ATA Storage Controller 1
Disk Controller : Giga-Byte (ICH9) 2 port Serial ATA Storage Controller 2
Disk Controller : Giga-Byte JMB36X PCIE-to-SATAII/IDE RAID Controller
Disk Controller : Giga-Byte JMB36X PCIE-to-SATAII/IDE RAID Controller
USB Controller 1 : Giga-Byte (ICH9) USB Universal Host Controller
USB Controller 2 : Giga-Byte (ICH9) USB Universal Host Controller
USB Controller 3 : Giga-Byte (ICH9) USB Universal Host Controller
USB Controller 4 : Giga-Byte (ICH9) USB2 Enhanced Host Controller
USB Controller 5 : Giga-Byte (ICH9) USB Universal Host Controller
USB Controller 6 : Giga-Byte (ICH9) USB Universal Host Controller
USB Controller 7 : Giga-Byte (ICH9) USB Universal Host Controller
USB Controller 8 : Giga-Byte (ICH9) USB2 Enhanced Host Controller
FireWire/1394 Controller 1 : NEC uPD72874 IEEE1394 OHCI 1.1 3-port PHY-Link Ctrlr
System SMBus Controller 1 : Intel 801xx/63xx SMBus

Network Services
Network Adapter : Realtek RTL8168/8111 PCI-E Gigabit Ethernet NIC - Packet Scheduler Miniport (Ethernet, 100Mbps)
Network Adapter : Hamachi Network Interface (Ethernet, 100Mbps)

Power Management
Mains (AC) Line Status : On-Line

Operating System(s)
Windows System : Microsoft Windows XP Professional 5.01.2600 (Service Pack 2)
Platform Compliance : x86

Performance Tips
Tip 2546 : Large memory modules should be ECC/Parity.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.

[spkguitar]

You're using XP SP2 with a multi-core processor; have you installed the Microsoft dual-core hotfix?

You might also want to update to SP3.

[TCM]

First of all use the DPC latency checker to get a clear picture.

Gigabyte MBs with early BIOS (yours is F2) suffer from latency spikes.
You have to get the latest BIOS which will take care of the latency.

[alfaholic]

I'm downloading SP3...

Yes, but I have OS X on the same machine, and everything works fine...