Windows 7: Neue Grafikkarte Alter Pc CPU-Belastung ständig auf 100%

Ich habe mir eine neue Grafikkarte (Radeon HD6450 1gb DDR3) für meinen alten PC besorgt (Fujitsu Siemens Scaleo P) und jetzt ist die CPU belastung ständig auf 100%. Der Pc ist langsamer als mit der alten Karte (Radeon x700 SE)

Meine Daten (durch DXdiag):

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System Information
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Time of this report: 4/17/2012, 20:02:01
       Machine name: NAM-PC
   Operating System: Windows 7 Home Premium 32-bit (6.1, Build 7600) (7600.win7_gdr.111118-2330)
           Language: German (Regional Setting: German)
System Manufacturer: FUJITSU SIEMENS
       System Model: GA-8S649MF
               BIOS: Award Modular BIOS v6.00PG
          Processor: Intel(R) Pentium(R) 4 CPU 2.93GHz, ~2.9GHz
             Memory: 1024MB RAM
Available OS Memory: 1024MB RAM
          Page File: 873MB used, 1174MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
   User DPI Setting: Using System DPI
 System DPI Setting: 96 DPI (100 percent)
    DWM DPI Scaling: Disabled
     DxDiag Version: 6.01.7600.16385 32bit Unicode

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Display Devices
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          Card name: AMD Radeon HD 6450
       Manufacturer: Advanced Micro Devices, Inc.
          Chip type: ATI display adapter (0x6779)
           DAC type: Internal DAC(400MHz)
         Device Key: Enum\PCI\VEN_1002&DEV_6779&SUBSYS_23111787&REV_00
     Display Memory: 1271 MB
   Dedicated Memory: 1015 MB
      Shared Memory: 255 MB
       Current Mode: 1280 x 1024 (32 bit) (60Hz)
       Monitor Name: PnP-Monitor (Standard)
      Monitor Model: SDM-HS74P
         Monitor Id: SNY3170
        Native Mode: 1280 x 1024(p) (60.020Hz)
        Output Type: DVI
        Driver Name: aticfx32.dll,aticfx32.dll,aticfx32.dll,atiumdag.dll,atidxx32.dll,atiumdva.cap
Driver File Version: 8.17.0010.1119 (English)
     Driver Version: 8.951.0.0
        DDI Version: 10.1
       Driver Model: WDDM 1.1
  Driver Attributes: Final Retail
   Driver Date/Size: 3/9/2012 07:16:28, 791552 bytes
        WHQL Logo'd: Yes
    WHQL Date Stamp:
  Device Identifier: {D7B71EE2-2439-11CF-6870-1B03BEC2C535}
          Vendor ID: 0x1002
          Device ID: 0x6779
          SubSys ID: 0x23111787
        Revision ID: 0x0000
 Driver Strong Name: oem7.inf:ATI.Mfg.NTx86.6.1:ati2mtag_NI:8.951.0.0:pci\ven_1002&dev_6779
     Rank Of Driver: 00E62001
        Video Accel: ModeMPEG2_A ModeMPEG2_C
   Deinterlace Caps: {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
                     {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YV12,0x32315659) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                     {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC1,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC2,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC3,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC4,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(S340,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                     {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(S342,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
       D3D9 Overlay: Not Supported
            DXVA-HD: Not Supported
       DDraw Status: Enabled
         D3D Status: Enabled
         AGP Status: Enabled





Mein Computer-System:
   
Mein PC ist etwa 5-6 Jahre alt.


Letze Aenderungen bevor der Fehler auftrat:

Ich habe neue Hardware installiert: PCI-Karte