New graphics card and psu for my amd athlon 64 x2 4450e

You were given horrible advice, imo.

a) Videocards perform only as well as the CPU it is connected to. You CPU, while not archaic, will limit the selection of cards that would be worth the price. A 4890 would not give you the performance that you would be paying for, it is too powerful for your computer. For your current parts, I would recommend at the highest an ATI4850, or Nvidia 250GTS.

b)700-800w PSUs are for computers with multiple videocards, Overclocked CPUs, and 10 harddrives needing power. It was very irresponible for that support staff to recommend such a powerful PSU for your build. Even if you did install a 4890 (a very powerful card) you could very easily get by with a quality 500-550w PSU.
Antec, Corsair, Seasonic, OCZ, PC Cooling&Power, are just a few of the brands that offer quality parts. Buying a cheap PSU puts your whole system at risk, as when cheap power supplies die, they like to take other parts of the computer with them.

c) You came to right place, lots of people here are great about sharing and educating when someone comes asking for help, provided they are willing to learn.
A few things you can tell us to help us make more direct suggestions:
-The resolution of your monitor, this effects how powerful of a card you can utilize.
-Your Budget

Well when i go to display settings the highest settings i can get is 1280x1024. I dunno if thats the resolution you were asking for but that is the highest on it. I really dont wanna spend more than $160 or 170 on a card and no more than 120 on a psu. But if you think it would make me run games alot better im willing to go up to $200. I know its not a powerful processor but it should be able to run games like dragon age origin with a new psu and video card on ultra low settings right? If im wrong plz let me know.

If you have a 19" lcd monitor with 4 x3 aspect ratio that would explain the max setting of 1280x1024. On that resolution this would be a good upgrade for the price (if your computer is not slimline) http://www.newegg.com/Product/Product.aspx?Item=N82E168... and would probably run just fine on your current PSU.

Do you think i could run dragon age origin or prototype at a good fps. i dont care if its at lowest graphics settings or not. When i play demigod now it lags like crazy. with that ati 4670 would i be able to run those 3 games at a good fps even if its on low graphics settings?

What about a good psu with enugh wattage to run the computer with the new video card?

http://www.examiner.com/x-10940-Oklahoma-City-PC-Examin....
http://www.pcgameshardware.com/aid,698666/Dragon-Age-Or...
HD4670 is about equal with HD3850

Ok cool. The first link you put up didnt work. what about a psu to run it all without having to worry about overheating or shorting out anything.

http://www.destructoid.com/here-are-prototype-s-system-...
here is another link for prototype HD4670 is better than those cards.
PSU cant beat this one at the moment price wise if it fits in your case, check the dimensions. http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Actually if you go for a new power supply that can support a stronger card and money is no issue. The maximum recommended cards, based on the rest of your system, would be GTS250 from the green team and hd4850 hd5750 from the red team.
Here is a good read http://www.tomshardware.com/reviews/best-graphics-card,... Pay attention to the chart on the last page.

MSI 4850 - $95
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Antec 500w PSU - $75
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Boom goes the dynamite ( for about 170).

Going with a 4870 or 5750 will break $200 budget, and I doubt that CPU can much use of much beyond a 4850.

How do i know what the dementions of my psu are? Can i look it up or do i have to physically measure it?

PSU dimensions for Desktop use are standardized. I think there are different kinds for servers and other non desktop use, but am not familiar with what they may be.

I can play dragon age on high settings with my 4670, on a 5000+ x2 amd, you should be good to go with that card

I added some of my own, but I still agree with JofaMang's advice. The 4850 would be the most powerful choice.

With regard to the PSU--get a good one if you plan to use it in a future computer, but if your next computer will be another prebuilt... just get the minimum wattage you need for the card you purchase+your current components. As long as you stick to a reputable brand like Antec, Corsair, PC Power and Cooling, etc. you will be fine.

Deadlocked you are the shizzznit. So the 4850 would be the most powerful one. Would the 400w Corsair would power my system and the graphics card? And that corsair is the same size as the one I have. Coolio. Thanks alot man.

Hey i went to the corsair website and put in my cpu and harddrive and the 4850 and you were right. If i could i would +rep

If it says anything to you: I own a intel E8200 with 4 gigs of ram and a HD3870. And I can play Dragon Age with everything maxed out except for AA at 1080p with 30+fps. I am surprised myself that it worked as well as it did but apparently my HD3870 was enough.

Thanks, although I feel sorta bad since JofaMang did much of the work.

The 4850 at $95 still blows the pants off anything in that price range. Its probably more power than you need to play those games, but if you arent poor--why not?

To rank: the 4850 is similar to a Nvidia GTS 250 or 9800 GTX in performance,
Below that would be the Nvidia 9800 GT($89) or ATI 4770($114) (the 4770 is more because its a newer model and power efficient) (the new Nvidia GT 240 falls right below these)

The level below that is the Nvidia 9600 GT at $75 and the ATI 4670, which would probably still be enough for those games at $60 if you decide to be cheap.

Like rolli said, check http://www.tomshardware.com/reviews/best-graphics-card,... for any clarifications.

While im 90% sure of the size, you should measure yours anyway just to be safe. I only have the picture to go on.

The HD4850 goes for $120ish lately, not $95

But anyway just get an HD4670. You will be able to play any game with that card on at least medium settings at your resolution. It goes for as low as $50 and you will not need to get a new power supply.
Don't put any more money than into that old system. Save up for a real upgrade instead.