Need a graphics card

I agree with LNCPapa.

read dell xps 420 manual: http://downloads.dell.com/Manuals/a...ner's manual2_en-us.pdf?c=us&l=en&cs=19&s=dhs

if you are confident enough, turn off dell xps 420, unplug from wall socket.
detach any sata power connector.
detach any molex connector.
detach any fan connector, if applicable.
detach 20/24 pin main power connector from motherboard.
detach 4pin connector from motherboard.
detach 4/6/8pin power connector from the discrete video card, if applicable.
unscrew psu from pc case.
remove dell psu for inspection.

then compare all the connectors of the dell psu unit with details of your preferred psu.

(or you can physically bring your dell xps 420 to the store where you bought it and ask advice from the sales person or computer technician)

Guys, I compared it to a diagram. It's the right size I will order the OCZ Psu. Thank you for all your help on this forum. I would eventually upgrade my CPU but I don't know if I can upgrade it or not, if I'm not asking to much. Please tell me if I can upgrade and what to... Thanks again

HU587 Conroe Kit, E4300, 1.80G, 2MB, 800FSB, L2
DX483 Conroe Kit, E4400, 2.00G, 2MB, 800FSB, L2
DX485 Conroe Kit, E6320, 1.86G, 4MB, 1066FSB, B2
DX484 Conroe Kit, E6420, 2.13G, 4MB, 1066FSB, B2
MP160 Conroe Kit, E6550, 2.33G, 4MB, 1333FSB
MP162 Conroe Kit, E6750, 2.66G, 4MB, 1333FSB, G0
MP628 Conroe Kit, E6850, 3.00G, 4MB, 1333FSB, G0
WM543 Conroe XE Kit, X6800, 2.93G, 4MB, 1066FSB, B2
MP626 Kentsfield Quad Core Kit, Q6600, 2.40G, 8MB, 1066FSB, G0
MP627 Kentsfield Quad Core Kit, Q6700, 2.66G, 8MB, 1066FSB, G0
UP673 Kentsfield Quad Core Kit, QX6700, 2.66G, 8MB, 1066FSB, B3
RX656 Kentsfield Quad Core Kit, QX6800, 2.93G, 8MB, 1066FSB, G0
PW016 Kentsfield Quad Core Kit, QX6850, 3.00G, 8MB, 1333FSB, G0
C863D Yorkfield Quad Core Kit, QX9300, 2.5G, 6MB, 1333FSB, M1
C864D Yorkfield Quad Core Kit, Q9450, 2.66G, 12MB, 1333FSB, C1
C865D Yorkfield Quad Core Kit, Q9550, 2.83G, 12MB, 1333FSB, C1
C299C Yorkfield Quad Core Kit, QX9650, 3.0G, 12MB, 1333FSB, C0
H786G Yorkfield Quad Core kit, QX9650, 3.0G, 12MB, 1333FSB, C1
X198G Wolfdale Dual Core kit, E7200, 2.53, 3MB, FD, 65W,M0
Y932C Wolfdale Dual Core Kit, E8200, 2.66G, 6MB, 1333FSB, 65W, C0
K905F Wolfdale Dual Core Kit, E8300, 2.83G, 6MB, 1333FSB, 65W, C0
Y935C Wolfdale Dual Core Kit, E8400, 3.0G, 6MB, 1333FSB, 65W, C0
Y934C Wolfdale Dual Core Kit, E8500, 3.16G, 6MB, 1333FSB, 65W, C0

The processors I listed above should all work, though in my opinion it would not be worth the time or cost to do so. Any socket 775 65nm cpu should be compatible.

You could probably buy a better performing modern motherboard and cpu for the money people are asking for a QX9650 online.

Thanks dude, I will be upgrading my motherboard and Cpu in about 6 months

Anyone recommend any motherboards that fit in my case and put an i5 in ?

Okay, got my graphics card yesterday and my Psu today. Fitted it all..., Then I got fan errors, it starts slow then turns to 100% speed. help please D:?

glad that your preferred psu and video card fit well.

on your new question, what fan?
case or system fan? (attached to the computer case and connected to motherbaord 3pin/4pin connector or to psu molex connector; may be located in front/back/top/bottom/side)
heat sink fan? (cools the processor)
psu fan? (cools the psu components)
video card fan? (cools the graphics processing unit)

if you don't have a fan speed regulator, then maybe the fan speed is auto-regulated...that is the fan will have its revolutions per minute (rpm) according to its designed range (like 800-1200rpm).

Well, on my xps 420 there is a little screen that shows me errors. It says something about the case fan. Cpu fan is going crazy, I replaced it and I still have this problem

Can you post screenshots of your current fan problem plus screenshots using either or both of the following free system monitoring utilites?

1. speedfan http://filehippo.com/download_speedfan/ or http://www.almico.com/speedfan.php
description from speedfan developer:
SpeedFan is a program that monitors voltages, fan speeds and temperatures in computers with hardware monitor chips. SpeedFan can even access S.M.A.R.T. info and show hard disk temperatures. SpeedFan supports SCSI disks too. SpeedFan can even change the FSB on some hardware (but this should be considered a bonus feature). SpeedFan can access digital temperature sensors and can change fan speeds accordingly, thus reducing noise. SpeedFan works fine with Windows 9x, ME, NT, 2000, 2003, XP, Vista, Windows 7 and Windows 8. It works with Windows 64 bit too.

2. speccy http://filehippo.com/download_speccy/ or http://www.piriform.com/speccy/download/standard
speccy screenshots http://www.piriform.com/speccy/screenshots

(it's too early to jump to conclusion but if the processor has a high temperature, then the heat sink fan will try to rotate as much as possible to bring down the cpu temperature. remedy includes cleaning of heat sink/fan, reapplication of thermal paste, or replacement of heat sink/fan with third party air cooling manufacturer like the cheap but effective coolermaster hyper 212 evo)

see to it that the case fan is properly powered. (attached to 3/4pin power connector or to molex from psu)
see to it that the heat sink fan is also properly powered. (attached to motherboard cpu fan connector)

a dirty/dusty pc case results in poor ventilation.
poor cable management results in hampered air flow, poor ventilation.
thermal paste (between hsf and processor) can dry up after years of use.
heat sink fan may have reached its end of life; fan can be replaced with similar product or entire hsf is replaced.

I have replaced the fan with another dell fan.. Still continues to make the noise. I will get pics and screen shots of the software. Will it damage my pc if I leave it running on 100% speed for too long?

It must be the Psu, because I put the old one back in and it runs fine.

Some PSUs have manufacturing defects like a piece of something (plastic/metal/screw/etc) impinges on the psu fan thereby causing an extra noise; or it may not be able to deliver the advertised power rating; or the psu itself is defective.

any defective pc component affects the whole pc.
error is a certainty.
damage is always a possibility.

Fixed the problem. Now I have the Blue screen of death

I have heard of BSOD due to faulty RAM, software/driver incompatibility but never due to psu.

since you have a new psu and new video card, turn off and unplug computer.
remove new video card and put back old video card.
turn on computer then uninstall your old video card driver.
turn off and unplug computer.
re-insert new video card.
turn on computer and install latest video card driver from gpu manufacturer
for nvidia, go here http://www.nvidia.com/Download/Scan.aspx?lang=en-us
for amd, go here http://support.amd.com/us/Pages/AMDSupportHub.aspx or http://support.amd.com/us/gpudownload

if you already uninstalled old video card driver, try to install latest video card driver.

I will do that but im using system tools to scan for faults.

Okay, I got a spare Hdd. I have a 4gb usb with windows 7 on it. I have a product key from my laptop. Its installing windows. After its done that, I will put in vista hdd format it or move things back over to this windows

Okay, fixed it. Everything runs smoothly. I can't access my 750gb Hdd. Is this because it has an operating system on? If so, how can I fix this... I want to try get my data back. Thank you for all the help

Personal folders under windows 7/8, "C:\Users\"
personal folders under windows xp, "C:\Documents and Settings"
other files/folders/game data in other partitions where you saved or installed them.
you may not be able to boot directly from another hdd if the hardware in which the OS was installed in it differed markedly from your current rig (processor and motherboard); bsod error.
instead, boot from your current hdd/ssd.

my intel dh55tc mobo has a boot selector menu by pressing F2 at boot time so if needed, I can select whether to boot from 500gb hdd, or 1tb hdd, or 3tb hdd.
other motherboard manufacturers may have different function key.

Okay, got all my files and games back Thank you for al the help. I will be upgrading my Cpu, motherboard and case in about 6 months time.Probably go for an i5 and 16gb of ddr3 ram.

Got my processor up to 2.8 Ghz, any higher blue screen.

Have you tested that overclock with a Prime95 blend? If it immediately blue-screens if you go any higher, it's definitely a good idea to do a stability test (you should do one with any overclock).