I am plaining to buy : HD5670 512MB with FSP Saga II 400W
Will be running folloing :
Windows 7 Ultimate Edition
CPU :Intel Core2 Quad CPU Q6600 @ 2.40GHz
MB Model : Intel DG33FB
RAM : 3 * 1072 MB DDR2 Dual Channel
HDD: 1 x 250Gb SATA WD 7200rpm
HDD: 1 x 80Gb IDE Samsung
DVD : DVD RW
and new HD 5670 512Mb
Now, I am worring about the PSU!.
1. will FSP Saga II 400W be sufficient for my system power requirnment?
2. Is the reliability / quality of FSP Saga II 400W ?
3. whts the actuall wattage for FSP Saga II 400W ? (read @ some places its actually 350W)
4. is there any better option in the same price range ???
The HD 6450's performance is about the same as the HD 5550's performance. The HD 5670 is the better card. DDR5 RAM is faster than DDR3 RAM so it will help with performance a little bit.
The issue you have is your old Intel motherboard. It is has a PCI-e 1.0 video card slot. Current video cards either have a PCI-e 2.0 or PCI-e 2.1 interface. Some motherboards with an old PCI-e 1.0 slot can have compatibility issues with a PCI-e 2.1 card. Therefore it is better to buy a video card with a PCI-e 2.0 interface.
That means avoid all Radeon HD 6xxx cards because they are PCI-e 2.1 cards. Additionally, during the middle of the Radeon HD 5xxx series, the cards switched interface from PCI-e 2.0 to PCI-e 2.1. Therefore, most of the HD 5xxx series cards can issues with your old motherboard.
You need to specifically look for a video card which states PCI-e 2.0 like the following HD 5670 512MB card for $63 after rebate + $3 shipping: