ComradeKin

Please read the series of emails and tell me if the supplier is lying to me.

- According to the manufacturer, the total amount of amps on the 12V rail is based on the sum of 12V3 and 12V4 rail as shown in his last email.
- The manufacturer also claims that the 460W supply is better than the 450W supply, when the 450W PSU has 34 AMPS on 12V line (according to my calculations, correct me if I am wrong)?

Details are below:
----------------------------------
ME:
I currently have a Compaq Presario S5200CL with the power supply featured here:

(250W)
http://www.power-on.com/atx250cpq.html

I was wondering if it is possible for me to upgrade to the power supply featured here:

(450W)
http://www.power-on.com/ea450p.html

I think that the dimensions are the same, even though my computer is considered as a Mid-Size Tower Micro ATX. However, it seems like it fits since the dimensions of the power supply are identical on both pages.

5.5" x 5.9" x 3.4"

I wanted to ask if all power supplies are compatible with any computer as long as the dimensions fit? Or is there more to it when choosing a power supply?

Thanks.
----------------------------------------
MANUFACTURER:
Possibly. Although I'd think the http://www.power-on.com/ea460.html makes more sense.

Thanks
Barry
-----------------------------------------
ME:
Can you tell me why the EA460 makes more sense? I was thinking about the EA450 instead of the EA460 because of the amperage as EA 450 has an 18 rating on both 12V rails while the 460 has a rating of 18 on one and 16 on the other. I am planning on getting a new GFX card that requires a power supply with 400W and a 20A rating on the 12V line.

I also noticed that both of those power supplies have 20+4 ATX. Is a 20+4 compatible with a 20 pin motherboard? Will I get the same full amount of amperage and power delivered if I use a 20+4 on a 20 pin motherboard? Also, if it is a 24pin PSU (24 pins, no blog of 4), would I be able to plug that into my 20 pin power supply?

Thanks in advance.
---------------------------------
MANUFACTURER:
If your GFX requires 20A alone, then neither of these power supplies is will work for you. You'll need this http://www.power-on.com/ea550.html , assuming the card has 2 pci female connectors, it will give you 30A @ 12V (12V3 & 12V4).

20+4 mean it can be used as 20pin or 24pin.
----------------------------------