Will a 400 watt PS (Antec SP-400) be enough for mid range?

I'm looking at the following setup

AMD X2 3800
Asus A8N-E (1 gig of ram, maybe 2)
7600GT
Western Digital 2500ks (maybe a smaller/cheaper sata II drive)
1 DVD Rom or writer (havn't decided yet, maybe the NEC 3550A?)

And I'm looking at the Antec TX640B which comes with a 400 watt power "antec smart power" supply (I don't like certain things about the sonata II, the finish and the hinged dealy). Will 400 watts be enough for this machine?

I don't plan to overclock at all. Or even better, can someone tell me if the 12 V is decent on this power supply since I've heard that's more important for the video card anyways (instead of the wattage of the power supply).

***Edit***
Ok, looking at antec's website, the SP-400 is only listed as having 10a/15a on the two 12v rails. Should I really look for a PS that has an 18 amp 12 volt rail?

I would suggest atleast a 450w PSU to be safe though your system shouldn't really need for then 300w. These are good one for around $100 on newegg

http://www.newegg.com/Product/Prod [...] 6817103933
http://www.newegg.com/Product/Prod [...] 6817103930
(No PFC on the above 2)

http://www.newegg.com/Product/Prod [...] 6817151023

If you're willing to go a little higher then this one from OCZ retails for $129-$10 MIR + $7shipping = $126. Its a 600w PSU and should last you for a long long time and is a good investment. Though it might be an overkill but seeing its better then most and not overpriced....you might wanna have a go at it.
http://www.newegg.com/Product/Prod [...] 6817341001

The total power of that PSU will be enough for you system specs, but as 1Tanker said, some 18A rails will be a bless

The 400w PSU should be fine.

The X2 3800+ draws 65w at full load.

I'm guessing the 7600GT should draw at most 42w, the 7900GT draws 49w.

Add in 20w for the mobo, 20w for the HDD, 15w for the DVD drive, 10w for two stick of RAM, 10w for a sound card, and 10w for two case fans.

That's a total of and estimate 192w at full load. Actually, power consumption during game play will be a little lower at around 175w and that is assuming the CPU and GPU are both stressed to their limits by the game at the same time.

I'm running an ANTEC SL-400... and my system drains way more power than yours should.
I wouldn't spend an extra 100 bucks on a PSU, Antec makes good power supplies.

good choice

As far as I can tell 120mm fans uses around 0.5 to 0.6 amps at full speed. More if they are LED fans. My estimate of 10w for 2 fans takes into consideration less than max RPMs.

Here is a review of a 120mm LED fan using 0.6 amps. The reviewer was actually shocked that at full speed, this LED fan only is 0.6 amps. That works out to 7.2 watts.

This puppy is running an X1900XT with no probs on my son's Opty rig:

http://www.newegg.com/Product/Prod [...] 6817104154

Very nice build quality, nice modular cables, plenty of PS for your needs. $60 after MIR.


Now that's a gr8 deal....i wonder how i missed that :?

I'll tell you a couple of things that helped with the decision. First, talking to the engineer that spec'ed that PS. He gave me some failure stats and they looked fine to me. He also told me about the kinds of in-house testing they do now with well-used copies of that PS. Basically they use them on test benches with a variety of graphics cards to test memory modules. So they run long and hard in a warm room. Second, I talked to other engineers that design power supplies. A couple of them mentioned that specific OCZ power supply (the Modstream 520) as a standard in the gaming PC industry. All of these discussions were within the context of how many supposedly high performance power supplies are having trouble running the new high-current graphics cards. So, yes, I saw some negative reviews out there too. But when other PS designers are basically jealous of a specific device, that tells you something. One more thing - I get the drift that it will not be available much longer. OCZ recently changed their PS lineup, adding the GamExtreme 600 and 700 models and if I understand correctly, the 520 is on the way out.

Any idea on the question of the amperage that it requires though?

http://extreme.outervision.com/psucalculator.jsp

Theres a power supply calculator for you