Need Advice: Quadro FX580 or Quadro 1800 ?

[pixela]

Dear friends,
I want to upgrade my videocard. Currently I am using Nvidia 8800 GT.

My choices are below.
One of the card has price almost 3X the other one. (with VAT etc) These are the prices in my country and I can't afford any higher one.
I wonder does it really make so much difference in persformance and does it worth?
What would you advise me?

Quadro FX 580
512MB GDDR3
$ 248

Quadro FX 1800
768MB GDDR3
$ 625


I also encounter this one Quadro FX 600 which has greater memory but much cheaper than the other ones. What disadvantage does it have?
Quadro FX 600
1GB - GDDR3
$ 233


Thank you everyone.

[vlado]

It depends on what you are going to use it for. For GPU rendering, I would not recommend any of these. For viewport performance, the fx1800 would probably perform better than the other two.

Best regards,
Vladlo

[pixela]

What would you recommend for viewport rendering in this price range?

[Donald2B]

I would recommend an nVidia GTX 460 2GB version. Should perform very well in your price range.