I'm a noob at the PSU thing.  
 
What I have is an HP a6245n desktop.  It's running a Q6600 with 4 gigs of ram.  
 
I recently bought a BFG 8600gts for a decent price.  I don't play games on this computer so I bought it to help with HD video playback and editing.
 
My HP has a Lite-on PSU with 19a on the single 12v rail.  I realize that this is not enough power although everything runs fine at the moment.  
 
Here's my motherboard.  
 
http://h10025.www1.hp.com/ewfrf/wc [...] ct=3577457
 
I'm looking at this power supply unit.  
 
http://www.ncix.com/products/index [...] ture=ANTEC
 
Will this PSU work with my A6245n?
 
Thanks for any insight.

This one much better for about the same money
http://www.newegg.com/Product/Prod [...] 6817139004

Thanks for the advice.  That Corsair PSU is available from the same site as the Antec and is $74.99 Cdn after mail in rebate.

Just my 2 cents - check the physical size of the new PSU and compare with the current PSU before you buy. I ended up buying a StealthXStream 600W for an HP (m7640n) because my first choices (Silencer 610W and Corsair 520HX) were too big to fit in that case.

 
Thanks for the advice.  I measured and the new PSU is the same physical size of the oem version.

I guess you're lucky
 
Go for it. The 550VX is a high quality product and gives you plenty of room for upgrades.