New to PSUs...Suggestions?

[supershadow]

I just looked over my PSU and discovered it was a Bestec 250w ATX250-12Z Rev. D7R, which doesn't have the best reputation, so I'm a bit worried about my coming upgrades to RAM and a new video card.

I'm looking at this SeaSonic as a replacment:

http://www.newegg.com/Product/...x?Item=N82E16817151055

Will its 300w be sufficient for an PC set up like this?:

AMD Athlon 64x2 4200+ Brisbane
2 or 3GB PC2-6400 RAM (this would be an upgrade)
160GB 7200rpm HD
DVD-RW Lightscribe
ATI HD4670, HD4650 or HD4550 512MB Video Card (this would be an upgrade)

Right now the PC has 1GB RAM and integrated Nvidia graphics.

I'm new to working with Power Supplies and never thought of the PSU as being so integral to upgrades I'm considering. I'm a bit hesitant on the upgrades because of concerns about the PSU. Would I be ok just going with the upgrades without changing the PSU (even with a low-end HD4550)?

All help is appreciated.

 

[theAnimal]

Plenty of power and good quality.

Edit: Referring to the Seasonic of course.

 

[MadAd]

no, if it was a good quality 300 id say hmm maybe, but a yonks old crapname 250? no way .... get a seasonic

 

[Lunyone]

24A on the combined 12v rails will be plenty for your build. You could also get the Antec EW 380w PSU that has 27A on the 12v rail for less ($1.60 less because of free shipping!!).

Antec earthwatts EA380 380W Continuous Power ATX12V v2.0 80 PLUS Certified Active PFC Power Supply - Retail

or for $55 - $10 MIR = $45!!! Has 30A on the 12v rail and still is of good quality too!!

CORSAIR CMPSU-400CX 400W ATX12V V2.2 80 PLUS Certified Compatible with Core i7 Power Supply - Retail

It's up to you, but the Antec 380w or the Corsair 400cx will allow for more room for upgrades over the Seasonic, but the Seasonic is a good buy too.