Upgrading 7300le

hi all

i'd like to start doing a couple of little upgrades to my pc and think the graphics card is the first point of call. i'm aware that my psu may be an issue though. if i can help it, i'd prefer not to upgrade the psu.
i'm not a big gamer but i do like rpg. my current game is oblivion with knights of the nine and shivering isles. it runs fine but in very low settings. 640x480 i think! i still enjoy the game mind.
i'd like to get the witcher and gothic3 so i think the card will be an issue

my sytem is a dell dimension e521
windows vista home premium (32 bit)
amd athlon 64 dou core 3600+ (2x1.9ghz)
2 gb ram (4x512mb pc2 5300)
geforce 7300le 128mb ddr3 turbo cache
psu says

305w
+5 22a -12 1a
+5(fp) 4a +3.3 17a
+12va 18a +12vb 18a
3.3v 5v 150w max
combined +12va and +12vb 264w max
max continous power output 305w
(it's 240v if that makes any difference?)
i'm looking to up the ram to 4gb of pc2 6400 as the motherboard says it supports 800mhz max memory speed


i don't want to spend bundles as it doesn't get loads of use
advice would be very helpful to me and if you're likely to get technical (please do as i can only learn more about pc's, not less) then it would help if you could explain thins like i'm a little bit slow.

many thanks

thankyou.
am i limited to psu types and/or are there any to avoid?

4650 would be a great card with out needing a better psu. A 5750/70 would be a fantastic card but unfortunately a new psu is needed.

many thanks.

i've found a site that shows power concumptions for graphics cards. i can cross reference this with the performance charts to give me a range of options in case i see a good deal on an alternative card.
i must admit though, the 4670 looks very attractive, as it way outperforms my 7300le and i can just plug it in, no hassles. perfect for some one cheap and lazy.
is it possible to work out roughly how much power i have available to run a card, bearing in mind i'd like to up the ram to 4gb pc2 6400?

this is the site with power consumption
http://mark.zoomcities.com/images/ [...] andgen.png

and this is my build specs from dell
LIST D05E15B DIMENSION E521
1 DIMENSION E521 AMD X2 PROCESSOR 3600(1.9
1 MEMORY - UPGRADE TO 1024MB (533 MHZ) (now 2048mb 533mhz)
1 ENGLISH DOCUMENTATION DIMENSION E521 WIT
1 DIMENSION RESOURCE DVD FOR VISTA (DIAGNO
1 MEMORY DUAL CHANNEL 1GB (2X512MB) 533MHZ
1 FLOPPY DISK DRIVE NOT INCLUDED
1 HARD DRIVE 160GB SERIAL ATA (7200 RPM)
1 DVD+/-RW (READWRITE) 16X
1 ROXIO SOFTWARE FOR VISTA - CREATOR / MYD
1 FP/SL SE197FP - UK/IRISH - VALUE 19'' FL
1 VIDEO CARD NVIDIA GEFORCE 7300 TURBOCACH
1 AUDIO INTEGRATED HDA 7.1 DOLBY DIGITAL C
1 SPEAKERS NOT INCLUDED
1 MODEM NOT INCLUDED
1 MOUSE PAD WITH DELL LOGO
1 MOUSE DELL OPTICAL (NOT WIRELESS) USB (2
1 UK/IRISH KEYBOARD DELL ENTRY QUIETKEY US
1 ENGLISH WINDOWS VISTA HOME PREMIUM
1 ENGLISH MICROSOFT WORKS 9.0 (WORD PROCES
1 UK INTERNET SERVICE PROVIDER - TISCALI (
1 ENGLISH ADOBE READER 8.1 (NO RECOVERY CD
1 COREL PSP PHOTO XI- 60 DAY TRIAL
1 COREL SNAPFIRE STARTER EDITION
1 DELL SUPPORT CENTER 2.0
1 ENGLISH MCAFEE 10.0 SECURITY CENTRE 30 D
1 1Y CAR (COLLECT AND RETURN)
1 NO WARRANTY UPGRADE
1 BASE WARRANTY
1 DIMENSION ORDER - UK
1 FREE DELIVERY - PROMOTIONAL OFFER

cheers alot for the help and advice

I thought they stopped doing this a long time ago. Compaq was the same way back when, but I've only ever had an issue 1 time. A coworker recently upgraded the PSU in his dell with a Thermaltake PSU, which was on the Dell upgrade site, but was the same model as on Newegg.

I'm willing to bet the 5xxx serious lower end cards will come out soon. I wanna see what these guys do.

o.k. i've read a few other posts and it's thrown up a couple of question i'd like to ask, regarding 'eco' or 'green' cards. i have seen that geforce now do 9800gt/9600gt '40% lower power consumption cards'. are these any good and are there equivelent ati type cards to these (5xxx lower end mentioned?)or is that what the 4670 is?