smartpower 2.0 450 enough for a 7800GT rig?

Moloch

[H]ard|Gawd
Joined
Sep 11, 2004
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3200+ winchester, 1 evga 7800GT (stock clocks at 445/1070), msi neo4-f, 3 hdds and 1 dvd writer.

I ask because I'm having stability issues with a 420watt atx 1.3 noisetaker and enermax wants me to get a new psu (put a ticket thing on website describing my problem) as does corsair since 1 stick fails memtest.
I was thinking about getting a sonata II which has the 450 watt smartpower II.
With some mild-moderate overclocking I'm wondering if such a combo would be ok, provided I add a 120MM intake, 92MM fan (yay a use for my old cpu fan) and 80MM fan?
I don't plan on upgrading the cpu or gpu for a while either.
 
Unfortunately my dad got me a 500W allied PSU which is not only a single 12V rail but lacking pci-express power connector despite having a 20+4 pin power connector and SATA power connectors (atx specs? who needs em...)
So far so good, but the 12V rating is erm... 20 amps to my noisetakers 29 amps combined 12V.
Anyway I was wondering since on paper and rep the enermax should be the vastly superior PSU but so far the allied PSU has been working for 3 hours including some 3dmark06 action as well as P95 testing for 45 minutes and in order to get that 500 watt rating it has supposedly it has 52 amps on the 5V, and all other rails are inferior to the noisetakers.
With the enermax the past few days it hasn't ran for more than an hour or so before shutting down and then only lasting a few minutes after turning it back on.
If the 20 pin atx connector is the problem with using an adapter help?
 
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