The GTX cards are discontinued. The FX3700 is not supported. So none of these would be advisable.
The only more or less affordable cards are the GTX470/480 cards based on the Fermi architecture and for which support is expected in the near future. But your PSU needs replacement and your disk setup requires improvements as well and your CPU is only mediocre. It may be worth to consider saving a bit longer to get a new system. My guess is that your current system is around 15 - 20 times slower than top performing systems.
i know that my system is not the best one, but please try to understand that i am only a beginner and my project will not be so complicated.
and about the cards, i know that the GTX 285/295 are discontinued but i can buy one of them from someone that have them to sell.
and if i buy a new card like GTX480/470, do you think that my power supply will work with this cards?
Thanks again for you help,
Your PSU is marginally OK for the HD4870, a bit light but it may do its job for some time. Nvidia cards are way more power hungry, especially with MPE enabled and an 850 W PSU would be around minimum.
You can try with a sub-par PSU, but keep in mind that you need both a 6-pin and an 8-pin PCI Express power cable and troubleshooting mysterious hangs, crashes, and other wierd errors, which are ultimately caused by a sub-par PSU, is very troublesome. NVidia suggests a 650W PSU as the absolute minimum, but that is pretty optimistic, and does not take into account heavy MPE use, long encode times with high CPU loads, nor capacitor aging, which are all typical on editing machines. If you don't have a big tower your risks increase because of high temperatures in your case.
you canpick up gtx 285 pretty cheap on ebay. if you can go for a 2gb version.
if i have to chose from 3 cards
1. GTX 285 (250$~)
2. GTX 295 (375$~)
3. GTX 470 (3504~)
which one is the best for me?
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Not knowing your wallet, number 3. Alternatively, number 1. Whatever you choose, get a new PSU.