thanks but the gtx 550 the power supply is 400W or greater ......the power supply from my pc is 300W, i don't understand so much about that but, with the configurations that i have with 4gb of memory and 2.9ghz, can i put the 400W?
or just 300?
as i saw the DDR5 graphics is 400W or greater , i don't know if that works...
If U cant Upgrade Your PSU than Go for 5670 DDR5..
I Used GT430 and It Just Sucks.
I Am Currently Using EVGA GTS 450 and It is Good with Antec450 Watt PSU(36Amps)..
Graphic card workability depends on amps on the 12 V rails of ur PSU,, How much are they?? check on the label of PSU there will b written 12V 1 output and 12v 2 output can b one rail also,, add the amps on both and than multiply them with 12 you will get the Power for GPU eg. 12V 1= 13Amp 12V2 =13 Amp totall = 13+13 X 12=316Watt...
Now Search cArd
That PNY 545 require 18Amp If v1+v2=more than 20 than ur Pc will take it.
If u can go for ATI then Go for 5670 if u dont want to upgrade PSU if u can upgrade
PSU than buy GTS450.
Search for the Amp requirement of any card u are looking not The PSU they Say...
And iif u dont have Bigger LCD than u dont need much graphic Memory . i used 5670 512MB on 1280x1024 and it is enough with 32bit OS.
go for it if u dont have much money and upgrade PSU if u still remain cash..