Will this video card upgrade increase performance without bottlenecking?

[Blu_Haze]

For christmas I'm wanting to get my mother a couple computer upgrades, the only problem is that she's a couple generations behind in hardware, which means an AGP motherboard, DDR RAM, and IDE hard drives.

This seriously limits the choices I have to upgrade her system, since she's at the point where her best bet is to buy a whole new computer with PCI-E, DDR2, SATA, etc. Unfortunately she won't be able to do that until at the very earliest of around march assuming she gets a good tax return.

In the meantime though, she can barely play the games she enjoys now. Even in WoW she gets massive framerate lag in instances. After checking out her system, I think the best upgrades for her until she can get a whole new rig is a new video card, another gigabyte of RAM, and overclocking her processor a bit. The only problem is I'm concerned if she'll actually see a dramatic increase in framerates with this, or if she'll run into a bottleneck.

Here's her system specs:
AMD Athlon XP 1900+
1 gig of RAM (offbrand)
Gigabyte GA-7N400 motherboard
ATI Radeon 9600 (not pro)
Starlogic 400W power supply

Will this video card in addition to a slight overlock to her CPU give her a very noticeable increase in framerate performance and picture quality? Or will it not make that much of a difference?

http://www.newegg.com/Product/Product.asp?item=N82E16814150157
(XFX GeForce 6800XT 256MB, GDDR3)

 

[note235]

maybe small bottlenecking

 

[blacken]

From a 9600 to a 6800xt will see a noticable difference as a lot of games are GPU sided. The 6800xt or even a 7600GS would be your bottlenecking point.
You must be from the northeast, using "her and she" is our thing also here in Maine.

 

[arthur_tuxedo]

I wouldn't worry about bottlenecking, but the 7600 GS is about the same price and is a better card.

 

[Zero82z]

I wouldn't worry about bottlenecking, but the 7600 GS is about the same price and is a better card.

Not if the 6800XT is unlocked, and I believe the XFX version can be. Of course, the success rate varies.