DPC Latency Problems  

When the computer has been powered on for a while (when I leave it on for the night) I get crackling sounds when playing music. A restart solves the problem (DPC goes normal). I have tried disabling almost all devices. Is RATTV3 the way for finding the problem? Had some problem using that tool.

It is possible that your sound card is giving way...your jack plug for your speakers might be touching a bit of metal inside the card.It may need replacing

Shouldn't the problem go away then if I disable the sound card?

yeah but so would all your other sound...have you got a spare?

What I mean is: I've tried disabling the sound card in Device Manager without the DPC going normal. The problem is starting to get annoying. I will try googling some more for a solution.

I know almost nothing about latency issues, BUT I recall some persons with the Intel i5 and i7 CPUs reporting that they have DPC latency problems unless they disable the C3/C6/C7 CPU power states in the BIOS. What's your CPU & motherboard?

Mainboard : Shuttle FP35
Processor : Intel Core 2 Duo E6850

Mainboard:

Code:

PC Wizard 2010 Version 1.93
------------------------------------------------------------------------------------------

Owner: Admin
User: Admin
Operating System: Windows 7 Ultimate Professional 6.01.7600 
Report Date: mandag 03 mai 2010 at 23:18

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<<< Mainboard >>>

  > Manufacturer : Shuttle Inc

    >> General Information
      Product : SP35
      Version : V10
      Serial Number : 0
      Unique ID : 01020907-03010106-08070605-04030201
      SKU : Unspecified
      Family : Unspecified
      Start mode : Power Switch

    >> Chassis Information
      Intrusion detected : No

  > Mainboard : Shuttle FP35

    >> General Information
      Manufacturer : Shuttle Inc (Shuttle)
      Product : FP35
      Version : V10
      Serial Number : 0
      Support MP : Yes, 2 CPU(s)
      Version MPS : 1.4

    >> Chassis Information
      Manufacturer : Shuttle Inc
      Type : Desktop
      Version : G5
      Serial Number : Unspecified
      Asset : Unspecified

    >> OEM Support SLIC
      SLIC : Yes
      SLP OA : v2.0

    >> Sensor Information
      Hardware Monitoring : ITE IT8718F

    >> On-Board Device Information
      Embedded Controller : Yes

    >> Slots Information
      Slot PCI-X : Available (32-bit) 5.0v
      Slot PCI-X : Available (32-bit) 5.0v

    >> External Connectors
      Serial 16450 Compatible : DB-9 male
      Serial 16450 Compatible : DB-9 male
      Parallel ECP/EPP : DB25 female
      Keyboard : PS/2
      Mouse : PS/2

    >> Internal Connectors
      PRIMARY IDE : On Board IDE
      SECONDARY IDE : On Board IDE
      FDD : On Board Floppy
      COM1 : 9 Pin Dual Inline (pin 10 cut)
      COM2 : 9 Pin Dual Inline (pin 10 cut)
      LPT1 : DB25 female
      Keyboard : PS/2
      PS/2 Mouse : PS/2

    >> EEPROM Information
      Type : EEPROM Specific
      Address : 0x57

  > Bios : Phoenix Technologies, LTD

    >> General Information
      Manufacturer : Phoenix Technologies, LTD
      Version : 6.00 PG
      Date : 07/03/2009  (mm/dd/yyyy)
      Address : 1024 KB
      Copyright : Copyright (C) 2007, Phoenix Technologies, LTD
      Motherboard ID : 07/03/2009-Bearlake-6A79OH2AC-00
      OEM Signature : (SP35S110) Intel P35 Express Chipset + ICH9R
      DMI Version : 2.5

    >> Characteristics
      Flashable : Yes
      Socketed : Yes

    >> Functionality
      APM : Yes
      ACPI : Yes
      ESCD : No
      PnP : Yes
      PCI : Yes
      ISA : Yes
      AGP : No
      USB : Yes
      PCMCIA : No
      Smart Battery : No

    >> Boot Information
      Selectable Boot : Yes
      CD-ROM Boot : Yes
      PC Card (PCMCIA) Boot : No
      I20 Boot : No
      LS-120 Boot : Yes
      1394 Boot : No
      ATAPI ZIP Boot : Yes
      Network Boot : No

  > Chipset : Intel G31/G33/G35

    >> General Information
      NorthBridge : Intel G31/G33/G35
      SouthBridge : 82801IR (ICH9R) LPC Interface Controller

    >> NorthBridge Information
      Architecture : Direct Media Interface (DMI)
      Manufacturer : Intel (Holco Ent)
      Codename : Bearlake
      Revision : A2
      Bus Speed : 332.5 MHz
      FSB Frequency : 1330 MHz (QDR)

    >> Memory Information
      Type : DDR2-SDRAM PC2-6400
      Frequency : 399 MHz
      DRAM/FSB Ratio : 6/5
      Supported Channels : Dual  (128-bit)
      Activated Channels : Single
      ECC Diagnostic : Nei
      CAS Latency (tCL) : 5 clocks
      RAS to CAS (tRCD) : 5 clocks
      RAS Precharge (tRP) : 5 clocks
      Cycle Time (tRAS) : 18 clocks
      Command Rate : 1 T

    >> Physical Capabilities
      DDR3-SDRAM Support : No
      Turbo Memory : No
      FlexMemory : Yes   -   Disabled
      IME Support : No
      AMT Support : No
      TPM Support : No
      VT Support : No
      TXT Support : No

    >> PCI-Express Information
      Number of ports : 3  -  (x16, x1, x1)

    >> Video Information
      Integrated Controller : No
      Enabled : No

    >> Functionality
      SATA AHCI Enabled : Yes
      RAID 0/1/10 Enabled : Yes
      RAID 5 Enabled : No
      PCI Express x1 Enabled : Yes
      Intel AMT  : Yes
      Intel QST  : No
      Intel IPT : No
      SPI Interface : Yes

    >> Device Capabilities (PCI)
      I/O Access : No
      Memory Access : Yes
      Bus Master Capable : Yes
      Special Cycle Recognition : No
      Memory Write & Invalidate : No
      VGA Palette Snoop : No
      Parity Error Response : No
      Cycle Wait : No
      System Error Line : No
      Fast Back-to-Back : No
      Detects Parity Errors : No
      User Defined Format : No
      PCI 66Mhz Bus Support : No
      New Capability List : Yes
      PCI Support : Vendor-Dependant

  > Physical Memory : 2048 MB DDR2-SDRAM

    >> General Information
      A0 (RAS 0, RAS 1) : 1024 (Double Bank)
      A1 (RAS 2, RAS 3) : 1024 (Double Bank)
      A2 : Empty
      A3 : Empty

    >> Information SPD EEPROM (A0)
      Manufacturer : Mushkin
      Part Number : 991533 (996533)
      Serial Number : Unspecified
      Type : DDR2-SDRAM PC2-6400 (399 MHz)  -  [DDR2-800]
      Format : Regular UDIMM (133,35 x 3)
      Size : 1024 MB (2 ranks, 4 banks)
      Module Buffered : No
      Module Registered : No
      Module SLi Ready (EPP) : Yes
      Width : 64-bit
      Error Correction Capability (ECC) : No
      Max. Burst Length : 8
      Refresh : Reduced (.5x)7.8 µs, Self Refresh
      Voltage : SSTL 1.8v
      Prefetch Buffer : 4-bit
      Manufacture : Week 10 of 2007
      Supported Frequencies : 266 MHz, 400 MHz
      CAS Latency (tCL) : 4 clocks @266 MHz, 5 clocks @400 MHz
      RAS to CAS (tRCD) : 4 clocks @266 MHz, 5 clocks @400 MHz
      RAS Precharge (tRP) : 4 clocks @266 MHz, 5 clocks @400 MHz
      Cycle Time (tRAS) : 12 clocks @266 MHz, 18 clocks @400 MHz
      Min TRC : 16 clocks @266 MHz, 23 clocks @400 MHz
      
      EPP Profile #1 : Abbreviated Performance
      Voltage Level : 2.1V
      Address Command Rate : 2T
      Cycle Time : 2.5ns @400 MHz
      CAS Latency (tCL) : 4 clocks
      RAS to CAS (tRCD) : 5 clocks
      RAS Precharge (tRP) : 4 clocks
      Cycle Time (tRAS) : 11 clocks

    >> Information SPD EEPROM (A1)
      Manufacturer : Mushkin
      Part Number : 991533 (996533)
      Serial Number : Unspecified
      Type : DDR2-SDRAM PC2-6400 (399 MHz)  -  [DDR2-800]
      Format : Regular UDIMM (133,35 x 3)
      Size : 1024 MB (2 ranks, 4 banks)
      Module Buffered : No
      Module Registered : No
      Module SLi Ready (EPP) : Yes
      Width : 64-bit
      Error Correction Capability (ECC) : No
      Max. Burst Length : 8
      Refresh : Reduced (.5x)7.8 µs, Self Refresh
      Voltage : SSTL 1.8v
      Prefetch Buffer : 4-bit
      Manufacture : Week 10 of 2007
      Supported Frequencies : 266 MHz, 400 MHz
      CAS Latency (tCL) : 4 clocks @266 MHz, 5 clocks @400 MHz
      RAS to CAS (tRCD) : 4 clocks @266 MHz, 5 clocks @400 MHz
      RAS Precharge (tRP) : 4 clocks @266 MHz, 5 clocks @400 MHz
      Cycle Time (tRAS) : 12 clocks @266 MHz, 18 clocks @400 MHz
      Min TRC : 16 clocks @266 MHz, 23 clocks @400 MHz
      
      EPP Profile #1 : Abbreviated Performance
      Voltage Level : 2.1V
      Address Command Rate : 2T
      Cycle Time : 2.5ns @400 MHz
      CAS Latency (tCL) : 4 clocks
      RAS to CAS (tRCD) : 5 clocks
      RAS Precharge (tRP) : 4 clocks
      Cycle Time (tRAS) : 11 clocks

    >> Memory Controller Information
      Memory Controller : DIMM
      Number of connectors : 4
      Max. Module Size : 2048 MB
      Max. Memory Size : 8192 MB
      Supported Speed : Unspecified
      Supported Voltages : 5v
      Error Detection Method : 8-bit Parity
      Error Correction Capability : None
      Current/Supported Interleave : 1-way/1-way

  > LPC bus : Yes

    >> Bus Information
      Type : ISA  -  LPC
      Device : 82801IR (ICH9R) LPC Interface Controller
      Revision : 02
      Number of ISA Connectors : 0

    >> Device Capabilities (PCI)
      I/O Access : Yes
      Memory Access : Yes
      Bus Master Capable : Yes
      Special Cycle Recognition : No
      Memory Write & Invalidate : No
      VGA Palette Snoop : No
      Parity Error Response : No
      Cycle Wait : No
      System Error Line : Yes
      Fast Back-to-Back : No
      Detects Parity Errors : No
      User Defined Format : No
      PCI 66Mhz Bus Support : No
      New Capability List : Yes
      PCI Support : Vendor-Dependant

  > PCI Bus : No

  > Bus PCI-Express : Yes

    >> PCI-Express Information
      Number of connectors : 1
      PCI-Express Base : 0xE0000000

    >> Bus PCI-Express
      Device : G35/G33/G31/P35/P31 Chipset PCIe Port 1
      Version : 1.0
      Port : 2
      Physical Slot : #4
      Slot Populated : Yes
      Link Width : x16   (max. x16)
      Link Speed : 2.5 GB/s

    >> Bus PCI-Express
      Device : 82801IB/IR/IH (ICH9 Family) PCIe Port 1
      Version : 1.0
      Port : 1
      Physical Slot : #2
      Slot Populated : Yes
      Link Width : x1   (max. x1)
      Link Speed : 2.5 GB/s

    >> Bus PCI-Express
      Device : 82801IB/IR/IH (ICH9 Family) PCIe Port 2
      Version : 1.0
      Port : 2
      Physical Slot : #2
      Slot Populated : Yes
      Link Width : x1   (max. x1)
      Link Speed : 2.5 GB/s

    >> Bus PCI-Express
      Device : G80 [GeForce 8800 GTS]
      Version : 1.0
      Port : 0
      Link Width : x16   (max. x16)
      Link Speed : 2.5 GB/s

  > USB Bus : Yes

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB UHCI Controller #4
      Version : 1.0
      Interface : UHCI
      Frequency : 48 MHz

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB UHCI Controller #5
      Version : 1.0
      Interface : UHCI
      Frequency : 48 MHz

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB UHCI Controller #6
      Version : 1.0
      Interface : UHCI
      Frequency : 48 MHz

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB EHCI Controller #2
      Version : 2.0
      Interface : EHCI

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB UHCI Controller #1
      Version : 1.0
      Interface : UHCI
      Frequency : 48 MHz

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB UHCI Controller #2
      Version : 1.0
      Interface : UHCI
      Frequency : 48 MHz

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB UHCI Controller #3
      Version : 1.0
      Interface : UHCI
      Frequency : 48 MHz

    >> Device Information
      Device : 82801IB/IR/IH (ICH9 Family) USB EHCI Controller #1
      Version : 2.0
      Interface : EHCI

  > SMBus/i2c Bus : Yes

    >> General Information
      Device : 82801IB/IR/IH (ICH9 Family) SMBus Controller
      Revision : 2
      Frequency : 16 KHz
      Address : 0x500
      SBI Protocol Enabled : No

    >> Device Capabilities (PCI)
      I/O Access : Yes
      Memory Access : Yes
      Bus Master Capable : No
      Special Cycle Recognition : No
      Memory Write & Invalidate : No
      VGA Palette Snoop : No
      Parity Error Response : No
      Cycle Wait : No
      System Error Line : No
      Fast Back-to-Back : No
      Detects Parity Errors : No
      User Defined Format : No
      PCI 66Mhz Bus Support : No
      New Capability List : No
      PCI Support : Slot

  > Bus HyperTransport : No

  > Bus QPI : No

  > Bus CardBus : No

  > Bus FireWire : Yes

    >> Bus Information
      Device : TSB43AB22 1394a-2000 OHCI PHY/Link-Layer Controller

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***** End of report *****

CPU:

Code:

PC Wizard 2010 Version 1.93
------------------------------------------------------------------------------------------

Owner: Admin
User: Admin
Operating System: Windows 7 Ultimate Professional 6.01.7600 
Report Date: mandag 03 mai 2010 at 23:19

------------------------------------------------------------------------------------------


<<< Processor >>>

  > Processor : Intel Core 2 Duo E6850

    >> General Information
      Type : Intel Core 2 Duo
      Internal Specification : Intel(R) Core(TM)2 Duo CPU     E6850  @ 3.00GHz
      Model Number : E6850
      Codename : Conroe
      Revision : G0
      Technology : 0.065µ
      CPU ID : 6.F.B
      CPU IDEx : 6.F.B
      Microcode : MU06FBB6

    >> Instructions
      IA-64 Technology : No
      Intel64 (EM64T) : Yes
      AVX : No
      FPU128 : No
      SSE5 : No
      SSE4a : No
      SSE4.2 : No
      SSE4.1 : No
      S-SSE3 : Yes
      SSE3 : Yes
      SSE2 : Yes
      SSE : Yes
      Extended 3DNow! Technology : No
      3DNow! Technology : No
      3DNOW Prefetch : No
      3DNow! Pro Technology : Yes
      AMD MMX Technology : No
      MMX Technology : Yes
      Cyrix MMX Technology : No
      FMA : No
      AES : No
      OSXSAVE : No
      MOVBE : No
      PCLMULQDQ : No
      CLF - Cache Line Flush : Yes
      CX8 - CMPXCHG8B : Yes
      CX16 - CMPXCHG16B : Yes
      CMOV - Conditionnal Move Inst. : Yes
      MON - Monitor/Mwait : Yes
      POPCNT : No
      RDTSCP : No
      SEP - Fast System Call : Yes

    >> Miscellaneous
      XD - No-execute Page : Yes
      VT-x - Virtualization : Yes
      TXT - Trusted Execution Technology : Yes
      SVM - Secure Virtual Machine : No
      FPU - Co-processor Built-in : Yes
      FXSR - Fast Float Save & Restore : Yes
      xTPR - Send Task Priority : Yes
      DAZ - Denormals Are Zero : Yes
      FFXSR : No
      LAHFSAHF : Yes
      CMPLEGACY : No
      ALTMOVCR8 : No
      ExtApicSpace : No
      3DNow! Technology : No
      PBE - Pend. Brk. EN. : No
      LAHF - LAHF/SAHF Inst. : No
      ABM : No
      MASSE - Misaligned SSE : No
      OSVW - OS Visible Workaround : No
      IBS : No
      P1GB - 1GB Page Size : No
      SKINIT, STGI, DEV : No
      WDT - Watchdog Timer : No

    >> Features
      x2APIC : No
      APIC - Local APIC Built-in : Yes
      VME - Virtual Mode Ext. : Yes
      DE - Debugging Extension : Yes
      PSE - Page Size Extension : Yes
      TSC - Time Stamp Counter : Yes
      MSR - Model Specific Registers : Yes
      PAE - Physical Address Extension : Yes
      MCE - Machine Check Exception : Yes
      MTRR - Memory Type Range Reg. : Yes
      PGE - Page Global Enable : Yes
      MCA - Machine Check Architecture : Yes
      PAT - Page Attribute Table : Yes
      PSE36 - 36-bit Page Size Extension : Yes
      PSN - Unique Serial Number : No
      DS - Debug Trace & EMON Store : Yes
      SS - Self Snoop : Yes
      ACPI - Software Clock Control : Yes
      TM - Thermal Monitor : Yes
      TM2 - Thermal Monitor 2 : Yes
      EST - Enhanced SpeedStep Technology : Yes
      HTT - Hyper-Threading : Yes
      SBF - Signal Break on FERR : Yes
      DSCPL - CPL qualified Debug Store : Yes
      CID - Context ID : No
      LT - LaGrande Technology : Yes
      PDCM : Yes
      DCA - Direct Cache Access : No
      EPS - Enhanced PowerSaver : No

    >> Features Multi-Core
      Physical Processor #1 (Core #1) : Apic ID 0
      Physical Processor #1 (Core #2) : Apic ID 1

    >> Power Status
      Turbo Boost : No
      Digital Thermometer : Yes
      Operating Point Protection : No
      Dynamic FSB : Yes
      Dynamic Acceleration : No
      Performance Energy Bias : No

    >> Addressing Information
      Physical Addressing max. : 36-bit
      Linear Addressing max. : 48-bit

    >> Advanced Settings
      In Order Queue Depth : 8
      Low Power Mode : No

    >> Mainboard Upgradeability
      Socket/Slot : Socket 775
      Upgrade interface : ZIF Socket
      Supported Speed : 4000 MHz (or more)
      Supported Voltage : 1.3V

  > Frequency : 3000 MHz

    >> General Information
      Real Frequency : 1994.91 MHz
      Multiplier : 6x
      Low/High Multiplier : 6x / 9x
      Multiplier Locked : Yes
      Marketing Frequency : 3000.06 MHz

    >> Front Side Bus Information
      Bus Speed : 332.5 MHz
      FSB Frequency : 1329.9 MHz (QDR)

    >> Initial Frequencies
      Frequency : 3000 MHz
      Bus Speed : 333.34 MHz (QDR)
      Multiplier : 9x

    >> Frequency Control
      Core #1 : 1994.92 MHz
      Core #2 : 1995.05 MHz

    >> Control Clock Frequency
      Enhanced SpeedStep (EIST) : Yes   -   Enabled
      C1E - Enhanced Halt Mode : No
      Dynamic FSB : Yes   -   Disabled
      Dynamic Acceleration (IDA) : No

    >> Thermal Information
      Thermal Design Power : 65 W
      Core Power : 43.23 W (estimated)
      Thermal control TM1 : Yes   -   Enabled
      Thermal control TM2 : Yes   -   Enabled
      Thermal Control Circuit : Yes
      Digital Thermal Sensor : Yes
      Clock Modulation (ODCM) Enabled : No

    >> Processor Performance Information

  > Number of Core : 2

    >> General Information
      Number of Core : 2  (max. 2)
      Number of Core Enabled : 2
      Number of Threads : 2
      Number of Thread per Core : 1  (max.2)

  > Support : Socket 775 LGA

  > Cache L1 : 2 x 64 KB

    >> General Information
      Type : Synchronous
      Write Mode : Write-Back
      Place : On Chip

    >> Cache Information
      Data Cache : 2 x 32 KB (8-way, 64 bytes line size)
      Code Cache : 2 x 32 KB (8-way, 64 bytes line size)

    >> Cache Parameters
      Type : Data Cache
      Ways of associativity : 8
      Fully Associative : No
      Self Intializing : Yes
      System Coherency Line Size : 64
      Physical Line partitions : 1
      Number of threads sharing : 1
      Number of processor cores : 2
      Number of Sets : 64

    >> Cache Prefetcher Optimization
      Adjacent Cache Line : Yes (128-bit)
      DPL L2 Cache : Yes
      DCU L1 Cache : Yes
      IP L1 Cache : Yes

  > Cache L2 : 4096 KB

    >> General Information
      Type : Synchronous
      Write Mode : Write-Back
      Place : On Chip
      Multiplier : 1/1x   (1995 MHz)

    >> Cache Information
      Associativity : 16-way
      Line Size : 64 bytes
      Bus : 256-bit
      Prefetch Logic : Yes

    >> Cache Prefetcher Optimization
      Adjacent Cache Line : Yes (128-bit)
      DPL L2 Cache : Yes
      DCU L1 Cache : Yes
      IP L1 Cache : Yes

  > Voltage VID : 1.300 V

    >> General Information CPU
      Voltage : 1.151 V
      MaxVID : 1.351 V
      MinVID : 1.351 V

  > FPU Coprocessor : Present

    >> General Information
      Integrated : Yes
      Model : Compatible Intel

  > Core 1 Activity : 12%

  > Core 2 Activity : 13%

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***** End of report *****

Any advices, or do I have to do a reformat? The problem goes away when restarting, and gradually the DPC goes haywire.