I plan on upgrading my pc and I have a few questions that I dont know.

First here is my computers current Information(If I missed any needed info LMK) :

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System Information
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   Operating System: Windows 8 64-bit (6.2, Build 9200) (9200.win8_gdr.130410-1505)
           Language: English (Regional Setting: English)
System Manufacturer: Hewlett-Packard
       System Model: h8-1414
               BIOS: v8.06
          Processor: AMD FX(tm)-6120 Six-Core Processor              (6 CPUs), ~3.5GHz
             Memory: 10240MB RAM
Available OS Memory: 10030MB RAM
          Page File: 2394MB used, 9106MB 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: 6.02.9200.16384 64bit Unicode

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DxDiag Notes
------------
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
        Sound Tab 2: No problems found.
          Input Tab: No problems found.

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Display Devices
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          Card name: AMD Radeon HD 7450
       Manufacturer: Advanced Micro Devices, Inc.
          Chip type: AMD Radeon Graphics Processor (0x677B)
           DAC type: Internal DAC(400MHz)
        Device Type: Full Device
         Device Key: Enum\PCI\VEN_1002&DEV_677B&SUBSYS_249F1462&REV_00
     Display Memory: 5765 MB
   Dedicated Memory: 1006 MB
      Shared Memory: 4758 MB
       Current Mode: 1360 x 768 (32 bit) (60Hz)
       Monitor Name: Generic PnP Monitor
        Native Mode: 1360 x 768(p) (60.015Hz)
        Output Type: HD15
        Driver Name: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver File Version: 8.17.0010.1140 (English)
     Driver Version: 8.981.0.0
        DDI Version: 11
     Feature Levels: 11.0,10.1,10.0,9.3,9.2,9.1
       Driver Model: WDDM 1.2
Graphics Preemption: DMA
 Compute Preemption: DMA
  Driver Attributes: Final Retail
   Driver Date/Size: 7/5/2012 14:21:34, 1108480 bytes
        WHQL Logo'd: Yes
    WHQL Date Stamp: 
  Device Identifier: {D7B71EE2-243B-11CF-A673-9504BEC2C535}
          Vendor ID: 0x1002
          Device ID: 0x677B
          SubSys ID: 0x249F1462
        Revision ID: 0x0000
 Driver Strong Name: oem3.inf:cb0ae4144888a682:ati2mtag_NI:8.981.0.0:pci\ven_1002&dev_677b&subsys_249f1462
     Rank Of Driver: 00E00001
        Video Accel: ModeMPEG2_A ModeMPEG2_C 
        DXVA2 Modes: DXVA2_ModeMPEG2_VLD  DXVA2_ModeMPEG2_IDCT  DXVA2_ModeH264_VLD_NoFGT  DXVA2_ModeVC1_VLD  
       D3D9 Overlay: Not Supported
            DXVA-HD: Not Supported
       DDraw Status: Enabled
         D3D Status: Enabled
         AGP Status: Enabled


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Disk & DVD/CD-ROM Drives
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      Drive: C:
 Free Space: 771.5 GB
Total Space: 932.1 GB
File System: NTFS
     

      Drive: D:
 Free Space: 2.5 GB
Total Space: 20.0 GB
File System: NTFS
      Model: WDC WD10EZEX-60ZF5A0 SCSI Disk Device

      Drive: F:
      Model: hp DVD A  DH16ACSHR SCSI CdRom Device
     Driver: c:\windows\system32\drivers\cdrom.sys, 6.02.9200.16384 (English), 7/25/2012 22:26:36, 174080 bytes

My first question is if having a power supply with a high output will effect everything else in the computer, like how currently I'm running a 300W PSU, would upgrading to a 950W effect things I don't plan to upgrade? As in feeding to much power?

Second question is how do I tell if a graphics card is compatible with my motherboard? Is it based on the prongs that go into the motherboard?

Last question, what are some cheep and good power supplies around 600W and a good graphics card compatible with it?

Also if it helps I have a stock HP Envy model.

No, coming off your PSU there are little cables that carry specific voltages, components will not receive too much power.


Your mobo has a PCIe x16 slot. That's pretty standard.


logicalincrements.com or read the sticky.