Best budget GPU compatible with a 375W Dell PSU?

Ok, i have a computer with a Core 2 Duo 6600 2.4 GHz, 2 GB of RAM and a 7950 GX2 along with a 375W PSU from Dell. And i am thinking of an upgrade, and i want a cheap, good GPU ( PCI Express) with low power supply requirements. I am got in mind the HD 5670, or a HD 5750, both the 1 GB versions.... But i am very open to anything you would recommend, i'd prefer NVIDIA but they seem to be more expensive and power hungry....So, i got a few questions that has to be answered before i decide wether im getting an upgrade or not;

* Will i get a noticeable performance increase?
* Will any of the 2 cards listed work on a 375 W Dell PSU? ( i am already running a GeFOrce 7950 GX2 1 GB, wich requires a PSU with a minimum rating of 400W)
* Are ATI 5-series less power hungry than NVIDIA Cards?
* How long will an upgrade last before it is "outdated"?
* Approximately how many FPS increase will i get? (if i get an increase at all, that is.)

The card is going to be mostly used for gaming, pretty heavy games like Crysis, CoD4 and i will be getting Crysis 2. And the card can't be very big, as i have not got alot of space in my computer... Although the 7950 GX2 is quite huge, i kind of want something a bit smaller, as my case is quite big but already completely STUFFED to the limit, and it has a fanless huge CPU cooler.

oh yeah and BTW i get alot of crashes while playing GTA IV, and the 7950 GX2 has a few heat issues... But anyways, i run the Crysis demo on High and 1024x768 Resolution with about 30 FPS, and CoD4 on highest settings without shadows witha bout 20-40 FPS.

yes you will get noticeable performance increase , and HD 5750 is defiantly will run 100% on that PSU u mentioned
the different between HD 5750 and 5670 is 25W . Max Power Draw for HD 5750 is 85W

and its depends on the card but tier are much nvidia card than ati eats alot of power
as for the upgrade , you should mention your monitor as well what res you playing with .
FPS 35+ more depends on the game

Yes it dose , but as for HD5670 its not requires one
on this res , go for HD 5775 .

do you have room for a dual slotted card.?

even better..
get the GTX460 nVidia.

meant to say GTS450...
i have this one:
MSI N450GTS CYCLONE 1GD5/OC GeForce GTS 450 (Fermi) 1GB 128-bit GDDR5

Not under-rated, properly rated by it's max continuous ouput.
As much faith as I have in it, I believe that a GTX460 would be pushing a bit to hard.

GeForce GTS 450
400 watt system requirement (don't worry about that only 400watt, your 375 is fine)
http://www.nvidia.com/object/produ [...] 50-us.html

upgrade your RAM
4GB(2x2GB) in dual channel mode.

Since you have added you budget
Go for GTX 460 1GB ver.
http://www.newegg.com/Product/Prod [...] 6814130565
More bandwidth The higher the memory bandwidth, the better the card will be able to handle large textures and anti-aliasing and anisotropic filtering
specially on your case ( 1680x1050 res) also helps on long term

but ,,,, unfortunately you will have to pay abit more says 50$ for the psu

And for my confirmation this spring, i will be getting alot of money... Im quite sure i will get 1000$ +, and i want money fro christmas and for my b-day. So Money isnt actually a very big problem.. As i got around $1500 already xD

Thanks alot... Although the 3d monitor + glasses costs about 500$ here..... And im not planning on using all my money! i hate Norway... everything is soo firetrucking expensive! Cars costs the double...

Or Far Cry 2

All those cards are a bit expensive....

Yeah, but i'm not sure if my PSU is going to be strong enough, and besides it is quite a bit more expensive than the cards we started out with discussing.

Yes, actually, i decided to get the 5770 instead. But i need money first

Lol im not gett8ing a card until after christmas... But will any of these cards run on a 300W HP PSU along with a Core i3 530 2.93 GHz and 8 GB of RAM and a 750 Gb HD?
I know HP PSU's are garbage, but.... Any chance?

Got any suggestions? I won't bother to change my PSU

No, it is a while until im actually ordering a card, but have you got any suyggestions???

No, i got 2 computers. One with a 375 W Dell PSu along with a COre 2 Duo 6600, 2 GB of RAM and 7950 GX2, and another system, with a 300W Hp PSU along with a Core ie 530, 8 GB of RAM and a HD 5450... The HD 5450 is absolute garbage for gaming, i need to get it changed... Ive changed my mind and the priority is now the 300W Hp PSU

I have Dell Studio XPS that had a 5770 and 350w psu and ran great, but I decided to upgrade last week. I bought Thermaltake 600w psu and Pny GTX 470 and the upgrade was simple the only problem I had was the 470 is huge and power plugs are on the side and I had to move Hdd to upper empty bay and get longer sata cable. I recommend that you upgrade psu first, because with that psu the 5670 and maybe GTS 450 are the only cards I would put on 300w. I only paid $75 for my psu!

yes!