My problem is that I am not sure whether the Radeon card will actually be to much for her machine and that it will be a bottleneck when it comes to performance.
The specs of her machine are:
Operating System: Windows Vista Ultimate (6.0, Build 6001) Service Pack 1 (6001.vistasp1_gdr.080917-1612)
Language: Danish (Regional Setting: Danish)
System Manufacturer: To Be Filled By O.E.M.
System Model: To Be Filled By O.E.M.
BIOS: Default System BIOS
Processor: Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz (2 CPUs), ~2.4GHz
Memory: 2046MB RAM
Page File: 969MB used, 3360MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 10
DX Setup Parameters: Not found
DxDiag Version: 6.00.6001.18000 64bit Unicode
I wouldn't get the Gigabyte HD 4850 1GB for 1428 DK. It's a good card, faster than the other two, especially at 1920x1200, but not really worth the extra 1428-1104 compared to the 512MB version IMO. I'm assuming your wife will play on a 20" or 22" monitor, 1680x1050. At that resolution the extra RAM in the 1GB version doesn't make a big difference.
See where your first post says "Page File: 969MB used"... With more RAM, that amount used from the hard disk would be smaller, and that means fewer accesses to the HDD (less noise, less heat, way faster, HDD lasts longer, etc.) Specifically, in games, it means less stuttering.
I'm guessing your PSU is a Corsair 520HX (can't think of another 520W right now). If that's true, no worries there either, it's plenty.
After going to bed last night I started thinking of getting the 9800GT card and tyhen add 2gb RAM to the PC instead.
I will take a look at that 4850 card you list though.
I have been using Nvidia for years but am a bit curious about the Radeon cards these days, so I am leaning towards such a card instead of the safe bet that the 9800GT card is.
My wife actually plays on a 19" TFT monitor, so she'll likely play in 1280x1024, which is why you're more than spot on when it comes to the RAM on the Radeon I listed. Isn't really useful with that amount when playing in such a 'low' resolution.
I just couldn't resist when I saw it. Will take a look at the card you list though and decide between that one and the 9800GT