Will GeForce 9800 GT Work on my machine?

I would like to buy the GeForce 9800 GT to play World of Warcraft since my display card I am using now is no longer supported.

1)What i would like to know is if it will work or is compatible with my system.
2)How do I know if my computer supports PCI-Express and if my mobo will support it with the proper wattage
3)Will a Benicia 1.01 model motherboard support a Nivida graphics card?

Ive downloaded CPU-Z and also looked through the MSINFO32 and DXDIAG but cant find anything in them that shows me what I am looking for.
Here's my machines specs.

OS Name Microsoft® Windows Vista™ Home Premium
Version 6.0.6002 Service Pack 2 Build 6002
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name MORKINTASH-PC
System Manufacturer HP-Pavilion
System Model KJ385AA-ABA a6433w
System Type X86-based PC
Processor Intel(R) Pentium(R) Dual CPU E2180 @ 2.00GHz, 2000 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 5.21, 2/26/2008
SMBIOS Version 2.5
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.0.6002.18005"
User Name Morkintash-PC\morkintash
Time Zone Central Standard Time
Installed Physical Memory (RAM) 3.00 GB
Total Physical Memory 2.99 GB
Available Physical Memory 1.83 GB
Total Virtual Memory 6.18 GB
Available Virtual Memory 4.76 GB
Page File Space 3.28 GB
Page File C:\pagefile.sys

Here are the specs on the card I am wanting to buy:

PNY - NVIDIA GeForce 9800 GT 1GB GDDR3 PCI Express Graphics Card
Model: VCG98GTEE1XPB
SKU: 8968094
PNY - NVIDIA GeForce 9800 GT 1GB GDDR3 PCI Express Graphics Card
Model: VCG98GTEE1XPB
SKU: 89680941GB GDDR3 PCI Express Graphics Card
Model: VCG98GTEE1XPB
SKU: 8968094

My Current System Specs:

Card name: Intel(R) G33/G31 Express Chipset Family
Manufacturer: Intel Corporation
Chip type: Intel(R) GMA 3100
DAC type: Internal
Device Key: Enum\PCI\VEN_8086&DEV_29C2&SUBSYS_2A6F103C&REV_02
Display Memory: 286 MB
Dedicated Memory: 0 MB
Shared Memory: 286 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: HP w2207 Wide LCD Monitor
Driver Name: igdumdx32.dll
Driver Version: 7.15.0010.1666 (English)
DDI Version: 9Ex
BGRA Supported: Yes
Driver Attributes: Final Retail
Driver Date/Size: 2/26/2009 18:34:14, 536576 bytes
WHQL Logo'd: Yes
WHQL Date Stamp:
Device Identifier: {D7B78E66-6A82-11CF-0E75-650AA2C2CA35}
Vendor ID: 0x8086
Device ID: 0x29C2
SubSys ID: 0x2A6F103C
Revision ID: 0x0002
Revision ID: 0x0002
Video Accel: ModeMPEG2_A ModeMPEG2_C
Deinterlace Caps: {AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend 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 VideoProcess_AlphaBlend
{AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend
{AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(YV12,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YV12,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend
{AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(NV12,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(NV12,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend
{AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(IMC1,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC1,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC1,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend
{AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(IMC2,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend
{AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(IMC3,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC3,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC3,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend
{AEDC1D5D-8546-440E-AAB2-B69FA725AF82}: Format(In/Out)=(IMC4,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_FieldAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC4,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC4,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled

I can't find a quick picture or spec's on your MB, in order for me to know what type of graphics slot you have, the easiest thing you can do is take a picture.

CPU-Z clearly said the G31. In which case normally has a single PCI-e slot. (I've owned 4.) Plus, the system isn't AGP old either, seen as it has a Core 2 Duo with DDR2 RAM. Unless HP deliberately left out the port for what ever reason.

OP... Just open up the side of the case and look. It's the simple. And yes, the 9800GT will work on ANY PCI-e port.

Hope this helps.

Actually it is good advice and you should not compare one mass made PSU to another as few are ever equal. I have 305w DELL PSU and it ran a 9800GT just fine also. Unfortunately HP does not use that same Delta made PSU so their generic 300w PSU is not on par and lacks the amps on the 12v the DELL offered. If the OP needs advice from a novice such as yourself, I'm sure he will ask you.

did you upgrade it? otherwise its probably the stock one.