Micro ATX power supply and Radeon HD 3850 AGP

Ok, I've been trying to do my research on PS's, but I still am having a hard time here. I gutted out an old e-machine case that uses a Micro-ATX power supply. I am currently using a Logisys 350 watt ps (specs+3.3@30A,+5V@20A,+12V@12A,-12V@0.8A,+5VSB@2.0A), and it seems to working just fine at the moment. I know this ps a cheapee, but it's working for now. My specs are:

Intel Core 2 due E4500 oc'd to the 1066 fsb @ 2.9 ghz
ATI Radeon x850 pro AGP (256 mb)
Gigabyte micro atx motherboard (yes, it's agp with ddr memory)
2 gb of DDR 400 memory
160 gb Samsung SATA hdd (and a 500 gb western digital in an external usb Sata enclosure, wall powered)
16x Sony DVD drive
18x Samsung DVD-RW drive
ATI 550 pro TV card
Sound Blaster live 24 bit sound card
1 80mm blue led exhaust fan
92 mm arctic cooling hsf

I am about to upgrade to a 512 mb Sapphire ATI Radeon 3850 agp card, and from what I've read, it wants a 450 watt power supply with 30A to the 12v rail. I've come across 2 power supplies that I feel might work. They are higher end then the Logisys, which I'm sure won't cut it.

The first is one I've not heard of, Athena Power. It is the AP-MP4ATX47FE, 470 watt dual 12v rails. The specs are +3.3V@12A,+5V@21A,+12V1@13A,+12V2@13A,-12V@0.8A, +5VSB@3.0A. It has the wattage, but may be lacking in the 12v rails department.

The other is the Seasonic SS-350SFE, 350 watt dual 12v rails. It's specs are +3.3V@20A,+5V@20A,+12V1@18A,+12V2@18A,-12V@0.8A, +5VSB@2.0A. It looks ok in the 12v rails department, but it may be lacking in the total wattage department. This one is also 80 plus certified, if that means anything.

I've read other forum posts about Corsair and PC Power and Cooling ps's being awesome, and that one should probably get a new motherboard, pci-e graphics card, and ddr2 memory... but I don't want to go that route right now, as I would basically have to build a whole new machine.

I would appreciate any opinions on whether the two matx ps's would work to power the 3850, and which one might be better. Both power supplies are at Newegg.com. Thankyou very much in advance.
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  1. Oh, I wanted to add one more thing. I did use that Extreme Power Supply Calculator. It says I only need a 269 watt power supply for my system, but from what I read, this calculator doesn't take everything into effect. Just fyi.
  2. Athena power dies on tier-5 ("Do not buy") of an older PSU tier listing, probably taking other components with it.
    Seasonic, however, generally is on tier-2, and that one should have no problem with your system.
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